Question

A beaker of concentrated hydrochloric acid has a pH of 1. What colour will full range universal indicator turn if it is added to this beaker? Is it a strong or a weak acid?

Answer 1

A beaker of concentrated hydrochloric acid with a pH = 1 is highly acidic. Therefore, when a full-range universal indicator is added, it will turn red. Hydrochloric acid (HCl) is a strong acid because it ionises almost completely in water to produce hydrogen ions (H⁺).