Question

(a) What is produced if an acid is added to a base?

(b) Why does dry HCl gas not change the color of dry litmus paper?

(c) What color does phenolphthalein indicator turn when added to an alkali (such as sodium hydroxide)?

Answer 1

(a) When acid is added to base there occurs neutralization reaction in which the products are salt and base.

(b) Dry HCl gas does not ionize to produce $H^{+}$ ions. hence, it does not show acidic properties and therefore does not change the color of dry litmus paper.

(c) Phenolphthalein in a basic medium exists in pink color.