Blue Salt
(NH4) 2SO4 is supposed to be a salt which is neutral, but how does it change the PAP red litmus blue?
(NH4) 2SO4 forms an acid solution with water. It should turn litmus paper red, not blue. The SO4 2 + ion is very acidic. Remember Thar Ammonia is a weak alkali, if the sulfate salt can be alkali
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