How to calculate pH value
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To adjust the pH of a certain water from 7.5 to 3.5, how many milliliters of 98% sulfuric acid are required? How to calculate it?
What kind of water is it? Is it simply pure water, or what type of water is it? The H+ concentration in it is very difficult to control; you can only adjust the pH by adding acid.
A pH value of 7.5 indicates weak alkalinity; when calculated as an alkali, at pH 7, the amount consumed is 10 to the power of minus 6.5 minus 10 to the power of minus 7, which equals 0.000000216. Starting from pH 7 and calculating as an acid, from pH 7 to 3.5, the amount required is 10 to the power of minus 3.5 minus 10 to the power of minus 7, which equals 0.0003161. Therefore, the total amount needed is 0.0003161 mol/L. For 1 liter of this solution, 0.031 grams of H2SO4 are required (0.0316 grams if using 98% concentrated acid)
The \"Sulfuric Acid Industry Manual\" includes calculations for adjusting the pH value of wastewater using lime milk. It can be used as a reference.