While I can't find a specific pH value - it is certainly acidic - as it's used to 'neutralise' alkaline soil.
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The solution is acidic.
The two common ways to prepare ammonium sulphate are neutralizing ammonia gas with sulfuric acid or reacting ammonium hydroxide with sulfuric acid. In the first method, ammonia gas is bubbled through sulfuric acid to form ammonium sulphate. In the second method, ammonium hydroxide is slowly added to sulfuric acid to produce ammonium sulphate.
The chemical formula of ammonium sulfate is (NH4)2SO4.
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The pH of a saturated solution of calcium sulfate is 7.7.