CN203812474U - Experimental apparatus using freezing point lowering method to determine solute molar mass - Google Patents
Experimental apparatus using freezing point lowering method to determine solute molar mass Download PDFInfo
- Publication number
- CN203812474U CN203812474U CN201420172808.3U CN201420172808U CN203812474U CN 203812474 U CN203812474 U CN 203812474U CN 201420172808 U CN201420172808 U CN 201420172808U CN 203812474 U CN203812474 U CN 203812474U
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- China
- Prior art keywords
- experimental apparatus
- sample hose
- thermometer
- temperature sensor
- air
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- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000008014 freezing Effects 0.000 title abstract 2
- 238000007710 freezing Methods 0.000 title abstract 2
- 239000011521 glass Substances 0.000 claims abstract description 10
- 238000003760 magnetic stirring Methods 0.000 claims abstract description 5
- 238000007664 blowing Methods 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 238000005086 pumping Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000002904 solvent Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 238000004781 supercooling Methods 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- -1 when bigness scale Substances 0.000 description 1
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- Sampling And Sample Adjustment (AREA)
Abstract
The utility model relates to an experimental apparatus using a freezing point lowering method to determine solute molar mass. The experimental apparatus includes a sample tube; the bottom of the sample tube is arranged in an air bushing; the top of the sample tube is provided with a rubber stopper; holes are formed in the rubber stopper; a temperature sensor and a glass bent tube respectively extend into the sample tube from the holes; the temperature sensor is connected with a digital Backman thermometer; one end of the glass bent tube is connected with an air pumping ball; the air bushing is arranged in a thermostatic bath; the thermostatic bath is arranged on a magnetic stirring device; the top of the thermostatic bath is provided with an ice adding opening; and a thermometer and a stirrer are arranged in the bath. The experimental apparatus of the utility model has the advantages of simplicity, easiness in implementation, favorable reproducibility and accurate measured results.
Description
Technical field
The utility model relates to a kind of experimental provision of cryoscopic method mensuration solute molal weight.
Background technology
It is the Classic Experiments in physical chemistry and Scale Experimental Teaching of Inorganic Chemistry that cryoscopic method is measured the experiment of solute molal weight, its ultimate principle is to utilize the colligative properties of lean solution, containing the solidifying point of two component lean solutions of Nonvolatile solute (in the time that solvent and solute do not generate solid solution) by the solidifying point lower than neat solvent. when having specified after the kind and quantity of solvent, solidifying point reduction value depends on the molecule number of contained solute, i.e. the solidifying point of solvent reduction is directly proportional to the concentration of solution.The experimental provision that existing cryoscopic method is measured molal weight adopted cold process, by gradually cold one-tenth over-cooled solution of liquid, while making to separate out in large quantity of fluid self-dissolving liquid by stirring, make system temperature increase owing to emitting latent heat of solidification, in the time that heat release is equal with exothermic temperature, temperature no longer changes, and this temperature is the equilibrium temperature of solid-liquid two-phase, the solidifying point of ie in solution; In whole experimentation, need hand operated mixing to make whole solution system temperature even, but the solute molal weight that uses the method to calculate is always on the low side than theoretical value, and reappearance is not fine.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of experimental implementation simple, and favorable reproducibility records result solute molal weight determinator accurately.
For achieving the above object, the utility model adopts following scheme:
A kind of cryoscopic method is measured the experimental provision of solute molal weight, comprise sample hose, described sample hose bottom is positioned at casing air, sample hose top is provided with rubber plug, rubber plug perforate, temperature sensor and glass bend pipe stretch in sample hose from tapping respectively, and described temperature sensor is connected with numeric type Beckman thermometer, the other end of described glass bend pipe is connected with air-blowing ball, and described casing air is placed in calibration cell; Described calibration cell is placed on magnetic stirring apparatus, and the top of calibration cell is provided with on the rocks mouthful, is provided with thermometer and stirrer in groove.
The beneficial effects of the utility model are:
(1) replace large beaker with calibration cell, guarantee that cold agent temperature remains unchanged and to control the cold unlikely degree of supercooling of agent temperature serious as far as possible;
(2) adopt magnetic agitation to be connected the glass bend pipe two kinds of alr modes of blowing with air-blowing ball, wherein, magnetic force rapid stirring is conducive to form crystallization, and simultaneously stirring rate is even, there will not be due to manually up and down stirring cause that breathing phenomenon brings water vapor into;
(3) in casing air, can add appropriate water, by changing sample hose and the upper and lower relative position of casing air, realize the change of heat conduction velocity between them;
(4) due to cold agent temperature constant and stirring rate even, and the good airproof performance of system, experimentation can not introduced water vapor and volatile solvent, experimental result is reproducible.
Brief description of the drawings
Fig. 1 is the utility model structural representation.
Description of reference numerals:
1-sample hose; 2-casing air; 3-calibration cell; On the rocks mouthful of 4-; 5-thermometer; 6-numeric type Beckman thermometer; 7-glass bend pipe; 8-air-blowing ball; 9-magnetic stirring apparatus; 10-stirrer; 11-temperature sensor.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described, the utility model discloses a kind of cryoscopic method and measure the experimental provision of solute molal weight, comprise sample hose 1, described sample hose 1 bottom is positioned at casing air 2, sample hose 1 top is provided with rubber plug, rubber plug perforate, temperature sensor 11 and glass bend pipe 7 stretch in sample hose 1 from tapping respectively, described temperature sensor 11 is connected with numeric type Beckman thermometer 6, the other end of described glass bend pipe 7 is connected with air-blowing ball 8, and described casing air 2 is placed in calibration cell 3; Described calibration cell 3 is placed on magnetic stirring apparatus 9, and the top of calibration cell 3 is provided with on the rocks mouthful 4, is provided with thermometer 5 and stirrer 10 in groove.
The course of work is: in calibration cell, pass into 4 DEG C of thermostatted waters, guarantee that cold agent temperature remains unchanged as far as possible, in casing air, add in advance 20mL water, when bigness scale, sample hose need not take out from casing air, its bottom is directly immersed in the water of casing air bottom, observe the variation of Beckman thermometer. when accurate measurement, first sample hose is shifted out to casing air, use hand warm liquid, after treating that solid all melts, sample hose is resetted in (water of bottom ingress of air sleeve bottom). in the time that temperature is down to higher than 0.5 DEG C, bigness scale solidifying point, promoting immediately sample hose makes its bottom just contact with water, bottom is crossed comparatively fast cold like this, more abundant, thereby can easily produce in advance nucleus, avoid large area cooling, cause crystallization too much to cause that the solidifying point of solution is on the low side. meet the requirement of the system that degree of supercooling is had relatively high expectations to primary crystallization forming core temperature.
By reference to the accompanying drawings embodiment of the present utility model is described although above-mentioned; but the not restriction to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendments that creative work can make or distortion still in protection domain of the present utility model.
Claims (1)
1. the experimental provision of a cryoscopic method mensuration solute molal weight, it is characterized in that, comprise sample hose, described sample hose bottom is positioned at casing air, and sample hose top is provided with rubber plug, rubber plug perforate, temperature sensor and glass bend pipe stretch in sample hose from tapping respectively, described temperature sensor is connected with numeric type Beckman thermometer, and the other end of described glass bend pipe is connected with air-blowing ball, and described casing air is placed in calibration cell; Described calibration cell is placed on magnetic stirring apparatus, and the top of calibration cell is provided with on the rocks mouthful, is provided with thermometer and stirrer in groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420172808.3U CN203812474U (en) | 2014-04-11 | 2014-04-11 | Experimental apparatus using freezing point lowering method to determine solute molar mass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420172808.3U CN203812474U (en) | 2014-04-11 | 2014-04-11 | Experimental apparatus using freezing point lowering method to determine solute molar mass |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203812474U true CN203812474U (en) | 2014-09-03 |
Family
ID=51451199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420172808.3U Expired - Fee Related CN203812474U (en) | 2014-04-11 | 2014-04-11 | Experimental apparatus using freezing point lowering method to determine solute molar mass |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203812474U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106814099A (en) * | 2017-01-04 | 2017-06-09 | 中国工程物理研究院化工材料研究所 | Freezing point, fusing point or crystalline temperature automatization test system |
| CN109459462A (en) * | 2018-10-31 | 2019-03-12 | 泉州市全通光电科技有限公司 | A kind of automatic freezing point apparatus and its test method |
-
2014
- 2014-04-11 CN CN201420172808.3U patent/CN203812474U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106814099A (en) * | 2017-01-04 | 2017-06-09 | 中国工程物理研究院化工材料研究所 | Freezing point, fusing point or crystalline temperature automatization test system |
| CN109459462A (en) * | 2018-10-31 | 2019-03-12 | 泉州市全通光电科技有限公司 | A kind of automatic freezing point apparatus and its test method |
| CN109459462B (en) * | 2018-10-31 | 2021-03-19 | 泉州市全通光电科技有限公司 | Automatic freezing point tester and testing method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140903 Termination date: 20150411 |
|
| EXPY | Termination of patent right or utility model |