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Acidity testing method for sulfuric acid solution containing copper and iron

A technology of sulfuric acid solution and determination method, which is applied in chemical analysis by titration, material analysis by observing the influence of chemical indicators, and analysis by chemical reaction of materials, etc., can solve the problem of inaccurate determination of acidity, titration The end point is not easy to judge and other problems, to achieve the effect of easy judgment and accurate acidity

Active Publication Date: 2014-12-17
HENAN GONGXIN ENVIRONMENTAL PROTECTION & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention: in order to solve the existing problems such as difficult judgment of titration end point and inaccurate acidity measurement in the acidity measurement process in the prior art, a kind of copper-containing iron sulfuric acid solution with easy judgment of titration end point and relatively accurate acidity measurement is provided Method for Determination of Acidity

Method used

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  • Acidity testing method for sulfuric acid solution containing copper and iron
  • Acidity testing method for sulfuric acid solution containing copper and iron
  • Acidity testing method for sulfuric acid solution containing copper and iron

Examples

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Embodiment 1

[0016] Embodiment one: A method for measuring the acidity of a copper-iron sulfuric acid solution, first calculating the acidity when the copper-iron ion content in the solution is 0g / L.

[0017] 1. Measurement method

[0018] Pipette 1ml of sulfuric acid solution containing copper and iron into a 250ml Erlenmeyer flask, add 75ml~100ml of deionized water, add 0.5g of potassium oxalate, shake well to fully dissolve, add 6~10 drops of bromocresol green-methyl red Mix indicator and titrate with sodium hydroxide standard solution. During the titration, when the sulfuric acid solution changes from dark red to dark green, add two drops in excess, which is the end point.

[0019] 2. Instruments and reagents used

[0020] Acid-base universal burette: 50ml; conical flask: 250ml; single-marked pipette: 1ml;

[0021] Sodium hydroxide: superior grade; Potassium oxalate: analytical grade; bromocresol green-methyl red mixed indicator.

[0022] 3. Solution preparation

[0023] (1) 0.1m...

Embodiment 2

[0036] Embodiment two: A method for measuring the acidity of copper-containing ferric sulfuric acid solution, when in the solution to be tested: 0g / L<copper ion content<5g / L, 0g / L<iron ion content<5g / L;

[0037] 1. Measurement method

[0038] Pipette 1ml of sulfuric acid solution containing copper and iron into a 250ml Erlenmeyer flask, add 75ml~100ml of deionized water, add 0.5g of potassium oxalate, shake well to fully dissolve, add 6~10 drops of bromocresol green-methyl red Mix the indicator and titrate with sodium hydroxide standard solution. When the sulfuric acid solution changes from dark red to dark green, add two drops in excess, which is the end point.

[0039] 2. Instruments and reagents used

[0040] Acid-base universal burette: 50ml; conical flask: 250ml; single-marked pipette: 1ml;

[0041] Sodium hydroxide: superior grade; Potassium oxalate: analytical grade; bromocresol green-methyl red mixed indicator.

[0042] 3. Solution preparation

[0043] (1) 0.1mol...

Embodiment 3

[0056] Embodiment three: The assay method of copper-containing ferric sulfuric acid solution acidity, method is the same as embodiment two, but used test solution is different during mensuration: in test solution 0g / L5g / L ,

[0057] Use methyl red indicator and bromocresol green-methyl red indicator respectively to measure the acidity of the solution; the solution with methyl red as indicator has turbidity, and the end color of the solution is yellow; The terminal color of the solution with phenol green-methyl red as indicator is bright green; the amount and acidity value of the sodium hydroxide standard solution consumed are as shown in Table 3, and the pH value of deionized water is 6.65.

[0058]

[0059] As can be seen from Table 3, when 0g / L5g / L in the solution, it can be seen from the volume, acidity value, and terminal pH value of the sodium hydroxide standard solution consumed : When methyl red is used as indicator, the acidity measurement result is larger tha...

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Abstract

The invention relates to an acidity testing method for a sulfuric acid solution containing copper and iron. The method includes transferring the sulfuric acid solution containing the copper and the iron into a conical bottle, adding deionzied water into the bottle, then adding appropriate potassium oxalate, shaking the bottle up to enable the potassium oxalate to be dissolved completely, dropping 6-10 drops of bromocresol green-methyl red mixed indicator into the bottle, conducting titration through a sodium hydroxide standard solution, dropping two drops of sodium hydroxide standard solution in an excessive mode to reach the terminal point when the sulfuric solution changes from dark red to dark green in the titration process and acquiring the acidity of the sulfuric acid solution containing the copper and the iron according to an acid-base titration formula. The method can well solve the problem that the terminal point is not obvious in change in the original acid-base testing method, no solution precipitation is produced in the titration process, the titration terminal point is easy to judge, and the measured acidity is accurate.

Description

technical field [0001] The invention relates to a method for measuring acidity, in particular to a method for measuring the acidity of copper-containing iron sulfuric acid solution. Background technique [0002] Acidity measurement is a commonly used operation in chemical experiments and production. The current acidity measurement uses methyl red as an indicator. The standard alkali solution is added dropwise to the acid solution, and the acid-base methyl red indicator is used to judge the titration end point. Record Lower the volume of the standard alkaline solution consumed last, and finally calculate the pH of the solution according to the relevant formula. [0003] For the determination of the acidity of copper-containing ferric sulfuric acid solution, the above method can also be used. The existing problem is that when the content of iron and copper in the solution is low, the copper is covered by potassium oxalate, and the color of the solution changes from red to yel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79G01N31/16
Inventor 侯晓英张杰陈淑盼任航
Owner HENAN GONGXIN ENVIRONMENTAL PROTECTION & TECH CO LTD
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