Question

write the ph value of zinc sulphate?

Answer 1

Zinc Sulfate doesn't have a pH, and it's clear by the question that you don't understand the concept of pH. No acid (or base) “has a pH”. pH is a measure of the concentration of Hydrogen ions in solution, so to find pH you need a concentration of your acid (or base). To calculate pH you take the negative log of the molarity (for a monoprotic acid) of the acid. For example, the pH of 1M HCl is 0, for sulfuric acid a molarity of ~.5M would give a pH of 0. This is only true for Bronstead/Lowry Acids/bases.