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A method for measuring acidity of copper-containing ferric sulfuric acid solution

A technology of sulfuric acid solution and measurement method, which is applied in chemical analysis by titration, material analysis by observing the influence on chemical indicators, and analysis by making materials undergo chemical reactions, etc., which can solve the problem of inaccurate determination of acidity and 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: 2016-08-17
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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  • A method for measuring acidity of copper-containing ferric sulfuric acid solution
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  • A method for measuring acidity of copper-containing ferric sulfuric acid solution

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Embodiment 1

[0016] Embodiment 1: A method for measuring the acidity of copper-iron sulfuric acid solution, first calculate the acidity when the content of copper and iron ions in the solution is 0 g / 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) 0.1...

Embodiment 2

[0036] Embodiment 2: A method for measuring the acidity of a copper-iron 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 / L sodium hydro...

Embodiment 3

[0056] Embodiment three: the mensuration method of copper-containing iron sulfuric acid solution acidity, method is the same as embodiment two, but used test solution is different during mensuration: 0g / Lin test solution 5g / 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 than w...

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Abstract

The invention relates to a method for measuring the acidity of copper-containing iron sulfuric acid solution. The method comprises pipetting the sulfuric acid solution containing copper and iron in a conical flask, adding deionized water, then adding an appropriate amount of potassium oxalate, shaking well to fully dissolve the potassium oxalate, adding 6-10 drops of bromocresol green-methyl red Mix indicator, titrate with sodium hydroxide standard solution; when the sulfuric acid solution changes from dark red to dark green during the titration process, add two drops of sodium hydroxide standard solution in excess to be the end point; according to the acid-base titration formula, calculate The acidity of this copper-containing ferric sulfuric acid solution is obtained. The invention can well solve the problem that the end point does not change significantly in the original acid-base measuring method, and the solution does not produce precipitation during the titration process; the titration end point is easier to judge, and the measured acidity is more 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 Patents(China)
IPC IPC(8): G01N31/16G01N21/79
Inventor 侯晓英张杰陈淑盼任航
Owner HENAN GONGXIN ENVIRONMENTAL PROTECTION & TECH CO LTD
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