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

HCl, with a pH of 1, imparts a red colour when treated with a universal indicator. As the pH value decreases from 7, the acidity increases, as there is an increase in the concentration of hydrogen ions (H⁺). So, the given acid is very strong.