Device for determining dissociation constant of weak electrolyte

A testing device and technology for dissociation constants, which are applied in the direction of chemical analysis by titration method, and can solve the problems such as complicated operation and inaccurate measurement results of devices and methods for dissociation constants of weak electrolytes.

Inactive Publication Date: 2012-06-20
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The commonly used devices and methods for measuring the dissociation constant of weak electrolytes are cumbersome to operate, and the measurement results may not be accurate enough

Method used

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  • Device for determining dissociation constant of weak electrolyte
  • Device for determining dissociation constant of weak electrolyte

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Embodiment Construction

[0012] A test device for the dissociation constant of a weak electrolyte, which consists of a pH meter, a magnetic stirrer, a titration cup, a liquid feeding pump and a constant temperature circulating water area. Between the layer and the outer layer is a constant temperature circulating water channel, which is connected to the constant temperature circulating device; the titration cup is placed on the integrated box of the magnetic stirrer and the pH meter; the delivery pipe of the liquid feeding pump extends into the titration inside the cup.

[0013] Preferably, the titration cup is fixed above the magnetic stirrer with iron clips, and can also be removed for cleaning and storage.

[0014] The pH meter is inserted into the sample solution to be tested so that the glass liquid film is immersed below the liquid surface, and is used for real-time determination of the pH value of the sample solution to be tested in the titration cup, and the measurement range is 0-14.

[0015...

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Abstract

The invention relates to a device for determining dissociation constant of weak electrolyte. The device consists of a pH meter, a magnetic stirrer, a titration cup, a liquid feed pump and a constant-temperature circulating bath, wherein the titration cup is a double-layer glass cup; a constant-temperature circulating water passage is formed between the inner layer and the outer layer of the glass cup, and is connected with a constant-temperature circulating device; the titration cup is placed on a box integrated with the magnetic stirrer and the pH value; and two feed pipes of the liquid feed pump extends into the titration cup, one for feeding a to-be-detected sample solution to the titration cup and the other one for adding a titrant into the titration cup slowly by adjusting flow rate of the liquid feed pump. The device provided by the invention can accurately, conveniently and rapidly determine dissociation constant of acidic or alkaline weak electrolyte solution, and can determine dissociation constants of a to-be-detected sample at different temperature by adjusting temperature of the constant-temperature circulating bath.

Description

technical field [0001] The invention relates to a test device for the dissociation constant of a weak electrolyte. Background technique [0002] The dissociation constant of weak electrolytes is an important physical and chemical property, and dissociation may affect the adsorption of chemicals to soil and sediment and the adsorption of chemicals to biological cells. Therefore, obtaining the dissociation constant of a chemical substance is very important for evaluating its impact on the environment and health. The commonly used devices and methods for measuring the dissociation constant of weak electrolytes are cumbersome to operate, and the measurement results may not be accurate enough. Contents of the invention [0003] In order to solve the above-mentioned technical problems, the present invention provides a test device for the dissociation constant of weak electrolytes, which is simple and fast in operation, accurate in measurement results and good in repeatability, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
Inventor 张宏哲张帆董国胜王慧欣张金梅王亚琴
Owner CHINA PETROLEUM & CHEM CORP
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