5(ii)
What would you say about the pH of a solution-
(a) in which the concentration of H+ ions is equal to concentration of OH- ions?
(b) which evolves hydrogen sulphide when added to ferrous sulphide?
(c) which produces a pungent smelling gas when heated with an ammonium salt?
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(a) The solution is neutral, so its pH = 7.
(b) The solution is an acid (an acid reacts with ferrous sulphide to give hydrogen sulphide), so its pH is less than 7.
(c) The solution is an alkali (an alkali on heating with an ammonium salt gives pungent-smelling ammonia gas), so its pH is greater than 7.