CN214749900U - Detection tube for determining molar mass of substance by freezing point depression method - Google Patents
Detection tube for determining molar mass of substance by freezing point depression method Download PDFInfo
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- CN214749900U CN214749900U CN202023327174.9U CN202023327174U CN214749900U CN 214749900 U CN214749900 U CN 214749900U CN 202023327174 U CN202023327174 U CN 202023327174U CN 214749900 U CN214749900 U CN 214749900U
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- tube
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- freezing point
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- 238000007710 freezing Methods 0.000 title claims abstract description 18
- 230000008014 freezing Effects 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000000126 substance Substances 0.000 title claims abstract description 12
- 238000001514 detection method Methods 0.000 title description 19
- 238000003756 stirring Methods 0.000 claims abstract description 38
- 229910001220 stainless steel Inorganic materials 0.000 claims description 14
- 239000011521 glass Substances 0.000 claims description 4
- 241001185540 Charissa ambiguata Species 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims 1
- 239000010935 stainless steel Substances 0.000 description 10
- 238000002474 experimental method Methods 0.000 description 6
- 239000012085 test solution Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 239000013081 microcrystal Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000003760 magnetic stirring Methods 0.000 description 1
- 238000001073 sample cooling Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
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Abstract
A detecting tube for determining the molar mass of a substance by a freezing point depression method comprises a test tube (1), a rubber plug (2), a stirrer (3), a guide tube (4), a fixing hole (5), a temperature sensor (6) and a guide ring (7), wherein the rotation and the shaking of the stirrer (3) are inhibited by adopting the three-ring stirrer (3) with coaxial different diameters and the guide tube (4) and the guide ring (7), and the effective measures such as coaxiality and fastening between the rubber plug (2) and the test tube (1) are enhanced by adopting the test tube (1), so that the stirring capacity is obviously improved, and the collision between the stirrer (3) and the tube wall of the test tube (1) and between the temperature sensor (6) is avoided; set up spacing ring (33) on stirring (3) pull rod, stopped stirring (3) and collided the emergence of breaking test tube (1) bottom phenomenon, practical application shows that this detecting tube practicality is good.
Description
Technical Field
The utility model belongs to the technical field of the chemistry experiment, it specifically indicates a detecting tube that is used for freezing point depression method survey material molar mass.
Background
The method for measuring the molar mass of the substance by the freezing point depression method is a classical chemical experiment with a hundred years history, effectively verifies the principle of colligative property, and also becomes an effective means for measuring the molar mass of the substance and the purity of the high-purity substance.
The detection tube (or called sample tube or reaction tube) is the core of an experimental device for measuring the molar mass of a substance by a freezing point depression method, and mainly completes the tasks of sample cooling, sample stirring, temperature detection and the like. Wherein the sample stirring has obvious influence on the experiment and even is related to success or failure of the experiment, such as: in the process that the test solution is turned to be over-cooled, the test solution is prevented from forming crystals on the inner wall of the detection tube only through stirring with certain strength, and the temperature gradient of the sample can be reduced or eliminated; the supercooled solution can promote the formation of crystal nucleus only by rapid stirring, thereby creating conditions for the generation of a large amount of microcrystals; only by proper stirring, a large amount of microcrystals can be fully dispersed into a liquid phase to quickly form balance; therefore, the experiment is in different stages, the stirring purpose is different, and the strength is different; in addition, friction between the stirrer and the pipe wall and between the stirrer and the temperature sensor generates heat, which affects the accuracy of the measurement result.
In the teaching material, the detection tube generally adopts a single-ring stirrer, the solution is stirred by the up-and-down movement of the stirrer, the stirrer is simple in structure, but the stirring effect is poor, and the stirrer sometimes breaks the bottom of the detection tube during rapid stirring; the CN 203812474U, CN 203811560U, CN 205786420U patent adopts a magnetic stirring mode, so that the reproducibility of experimental data is obviously improved, but the relative position of a magnetic stirrer and a detection tube needs to be adjusted, and the experimental device is relatively complex; the mode of extruding the test solution by using the rubber head has the limitation of small variation range of stirring strength, so that the method has practical significance for improving stirring quality and perfecting the detection tube.
Disclosure of Invention
Based on the limitation that current detection pipe exists, the utility model discloses a following technical measure: large, medium and small three-ring stirrers with different coaxial diameters are used for improving the stirring efficiency; the rotation and the shaking of the stirrer are limited by utilizing a pull rod and a directional rod which run in a guide pipe and a guide ring, and the deviation of the axis of the stirrer is restrained by adopting the positioning of the upper part of a test tube matched with a rubber plug and the fastening of the rubber plug, so that the stirring ring does not collide with the pipe wall and the temperature sensor; the limiting ring is arranged on the pull rod of the stirrer, so that the stirrer can be prevented from touching the bottom of the test tube and being broken.
The utility model provides a detection tube for freezing point depression method survey material molar mass, by test tube (1), plug (2), stirring (3), stand pipe (4), fixed orifices (5), temperature sensor (6), guide ring (7) are constituteed, stand pipe (4), guide ring (7) are vertical to be fixed on plug (2), fixed orifices (5) are vertical to be beaten in plug (2) center department, upper portion (11) at the test tube are fixed in plug (2), plug (2) are passed through guide tube (4) in pull rod (32) of stirring (3), guide ring (7) lower extreme annulet is passed in orientation bar (34) of stirring (3), temperature sensor (6) are fastened on plug (2) through fixed orifices (5).
Furthermore, the test tube (1) is made of glass, the upper part (11) of the test tube is in an inverted round table shape, the upper inner diameter and the lower inner diameter are 40mm and 38mm respectively, the height is 15mm, the cross section of the lower part (12) of the test tube is in a round shape, the inner diameter is 33mm, and the length is 120 mm.
Furthermore, the rubber plug (2) is a No. 9 rubber plug, the upper diameter and the lower diameter of the rubber plug are 46mm and 38mm respectively, and the height of the rubber plug is 30 mm.
Furthermore, the stirrer (3) is made of stainless steel wires with the diameter of 1mm and comprises a stirring ring (31), a pull rod (32), a limiting ring (33) and a directional rod (34), wherein the stirring ring (31) comprises three coaxial stirring rings with different diameters, the diameters of a large ring (311), a middle ring (312) and a small ring (313) are 23mm, 19mm and 15mm respectively, the pull rod (32) is formed by extending the stainless steel wires of the large ring (311), the directional rod (34) is formed by extending the stainless steel wires of the small ring (313), and the limiting ring (33) is formed by directly screwing and fixing the stainless steel wires (32) with the diameter of 1 mm.
Furthermore, the guide pipe (4) is a hard plastic pipe with the inner diameter of 1.5 mm.
Furthermore, the fixing hole (5) is vertical to the end face of the rubber plug, and the diameter of the fixing hole is the same as the outer diameter of the temperature sensor (6).
Furthermore, the guide ring (7) is made of stainless steel wires with the diameter of 1 mm.
Through increasing effective stirring ring quantity to the supporting stand pipe of double-pull rod draws and send the stirring ring, reinforce the coaxial and fastening of plug and test tube with the test tube, set up effective measures such as spacing ring on the pull rod, show the stirring ability that has improved the test tube, avoided stirring and pipe wall, temperature sensor's collision, stop the breakage of glass test tube, the experiment proves, this test tube is more practical than current test tube.
Drawings
FIG. 1 is a schematic view of a detector tube.
FIG. 2 is a schematic view of the stirrer in the detection tube.
In fig. 1 and 2: 1 test tube, 2 rubber plugs, 3 stirrers, 4 guide tubes, 5 fixing holes, 6 temperature sensors, 7 guide rings, 11 test tube upper parts, 12 test tube lower parts, 31 stirring rings, 32 pull rods, 33 limiting rings, 34 directional rods, 311 large rings, 312 middle rings, 313 small rings
Detailed Description
The utility model provides a detection tube for freezing point depression method survey material molar mass, by test tube (1), plug (2), stirring (3), stand pipe (4), fixed orifices (5), temperature sensor (6), guide ring (7) are constituteed, stand pipe (4), guide ring (7) are vertical to be fixed on plug (2), fixed orifices (5) are vertical to be beaten in plug (2) center department, upper portion (11) at the test tube are fixed in plug (2), plug (2) are passed through guide tube (4) in pull rod (32) of stirring (3), guide ring (7) lower extreme annulet is passed in orientation bar (34) of stirring (3), temperature sensor (6) are fastened on plug (2) through fixed orifices (5).
Furthermore, the test tube (1) is made of glass, the upper part (11) of the test tube is in an inverted round table shape, the upper inner diameter and the lower inner diameter are 40mm and 38mm respectively, the height is 15mm, the cross section of the lower part (12) of the test tube is in a round shape, the inner diameter is 33mm, and the length is 120 mm.
Furthermore, the rubber plug (2) is a No. 9 rubber plug, the upper diameter and the lower diameter of the rubber plug are 46mm and 38mm respectively, and the height of the rubber plug is 30 mm.
Furthermore, the stirrer (3) is made of stainless steel wires with the diameter of 1mm and comprises a stirring ring (31), a pull rod (32), a limiting ring (33) and a directional rod (34), wherein the stirring ring (31) comprises three coaxial stirring rings with different diameters, the diameters of a large ring (311), a middle ring (312) and a small ring (313) are 23mm, 19mm and 15mm respectively, the pull rod (32) is formed by extending the stainless steel wires of the large ring (311), the directional rod (34) is formed by extending the stainless steel wires of the small ring (313), and the limiting ring (33) is formed by directly screwing and fixing the stainless steel wires (32) with the diameter of 1 mm.
Furthermore, the guide pipe (4) is a hard plastic pipe with the inner diameter of 1.5 mm.
Furthermore, the fixing hole (5) is vertical to the end face of the rubber plug, and the diameter of the fixing hole is the same as the outer diameter of the temperature sensor (6).
Furthermore, the guide ring (7) is made of stainless steel wires with the diameter of 1 mm.
Utilize the utility model discloses detect the test solution freezing point
Pouring the test solution into a test tube (1), and fastening a rubber plug (2) attached with a stirrer (3), a temperature sensor (6) and a guide ring (7) on the upper part (11) of the test tube;
initial measured freezing point: placing a detection tube in a cold agent, pulling a stirrer (3) at a speed of 1 time/second, when the solution reaches an expected supercooling temperature, rapidly pulling the stirrer (3) at a speed of 3-5 times/second, when the temperature rises, pulling the stirrer (3) at a speed of 1 time/second until the temperature is stable, recording the temperature, wherein the temperature is an initial detection solidification point, and microcrystals appear at the moment;
the freezing point was measured accurately: taking out the detection tube, holding the tube with hands, placing the detection tube in a cold agent after the ice in the tube to be detected is completely melted, quickly taking out the detection tube when the temperature of the test solution is reduced to 0.2 ℃ higher than the initial detection freezing point temperature, wiping the tube dry, inserting the tube into an air sleeve, and pulling the stirrer (3) at the speed of 1 time/second to uniformly reduce the temperature. When the temperature is lower than the initial measurement freezing point, the stirrer (3) is rapidly pulled at the speed of 3-5 times/second, when the temperature starts to rise, the stirrer (3) is pulled at the speed of 1 time/second until the temperature is stable and unchanged, the temperature is recorded, the temperature is the accurately measured freezing point, and at the moment, microcrystals appear.
Claims (7)
1. A detecting tube for determining the molar mass of a substance by a freezing point depression method is characterized in that: it is by test tube (1), plug (2), stirring (3), stand pipe (4), fixed orifices (5), temperature sensor (6), guide ring (7) are constituteed, stand pipe (4), guide ring (7) are vertical to be fixed on plug (2), fixed orifices (5) are vertical to be beaten in plug (2) center department, upper portion (11) at the test tube are fixed in plug (2), plug (2) are passed through stand pipe (4) in pull rod (32) of stirring (3), guide ring (7) lower extreme annulet is passed in directional pole (34) of stirring (3), temperature sensor (6) are fastened on plug (2) through fixed orifices (5).
2. The tube according to claim 1, wherein the tube (1) is made of glass, and has an upper portion (11) in the shape of an inverted truncated cone with an upper and lower inner diameter of 40mm and 38mm, respectively, a height of 15mm, and a lower portion (12) in the shape of a circle in cross section, an inner diameter of 33mm, and a length of 120 mm.
3. The detecting tube for the freezing point depression method to determine the molar mass of substances according to claim 1, characterized in that the rubber plug (2) is No. 9 rubber plug, the diameters of the upper and lower ends are 46mm and 38mm respectively, and the height is 30 mm.
4. The tube according to claim 1, wherein the stirrer (3) is made of stainless steel wire with a diameter of 1mm, and comprises a stirring ring (31), a pull rod (32), a limiting ring (33) and a directional rod (34), the stirring ring (31) comprises three coaxial stirring rings with different diameters, the diameters of the large ring (311), the middle ring (312) and the small ring (313) are 23mm, 19mm and 15mm respectively, the pull rod (32) is formed by extending the stainless steel wire of the large ring (311), the directional rod (34) is formed by extending the stainless steel wire of the small ring (313), and the limiting ring (33) is formed by directly screwing the copper wire with a diameter of 1mm on the pull rod (32).
5. The tube for measuring the molar mass of substances by the freezing point depression method according to claim 1, characterized in that the guide tube (4) is a rigid plastic tube with an inner diameter of 1.5 mm.
6. The detecting tube for freezing point depression method to determine the molar mass of substances according to claim 1, characterized in that the fixing hole (5) is perpendicular to the end face of the rubber plug and has the same diameter as the outer diameter of the temperature sensor (6).
7. The tube according to claim 1, wherein the guide ring (7) is made of stainless steel wire with a diameter of 1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023327174.9U CN214749900U (en) | 2020-12-31 | 2020-12-31 | Detection tube for determining molar mass of substance by freezing point depression method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023327174.9U CN214749900U (en) | 2020-12-31 | 2020-12-31 | Detection tube for determining molar mass of substance by freezing point depression method |
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| Publication Number | Publication Date |
|---|---|
| CN214749900U true CN214749900U (en) | 2021-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023327174.9U Expired - Fee Related CN214749900U (en) | 2020-12-31 | 2020-12-31 | Detection tube for determining molar mass of substance by freezing point depression method |
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| CN (1) | CN214749900U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666202A (en) * | 2020-12-16 | 2021-04-16 | 武汉理工大学 | Device and method for measuring alloy solidification behaviors at different cooling speeds |
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2020
- 2020-12-31 CN CN202023327174.9U patent/CN214749900U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666202A (en) * | 2020-12-16 | 2021-04-16 | 武汉理工大学 | Device and method for measuring alloy solidification behaviors at different cooling speeds |
| CN112666202B (en) * | 2020-12-16 | 2023-11-24 | 武汉理工大学 | Device and method for measuring alloy solidification behavior under different cooling speeds |
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211116 |