Question

What Will be the effect of these salts using either blue or red litmus paper on hydrolysis?
Copper chloride (CUCl2)
Copper sulphate (CUSO4)
Barium chloride (Bacl2)
Ammonium chloride (NH4Cl)

Answer 1

consider how they were formed and the reverse equilibrium reaction:
Cu(OH)2 + 2HCl >> CuCl2 + 2H2O The reverse reaction will be strong acid, weak base, so litmus will be red
Cu(OH)2 + H2SO4>>CuSO4 + 2H2O... reverse reaction produces strong acid, weak base, litmus red.
NH4 (OH) + HCl >>NH4CL + H2O reverse, acid.

Answer 2

https://www.jiskha.com/questions/1795599/What-will-be-the-effect-of-these-salts-using-either-blue-or-red-litmus-paper-on-hydrolysis