Question

What will be the colour of litmus in an aqueous solution of ammonium chloride salt?

Answer 1

Blue litmus turns red. The NH₄Cl is formed from a weak base, ammonium hydroxide (NH₄OH), and a strong acid, hydrochloric acid (HCl). So, when dissolved in water, NH₄Cl will hydrolyse to form more H⁺ ions than OH⁻ ions, making it acidic.