Question

What do you mean by strength of an acid? How can the strength of the two acids be compared?

Answer 1

Strength of an acid depends on its pH value. If the pH value of acid is more than the other its a stronger acid. Strong acids has more reactivity power.

Answer 2

it is the capacity to get ionised into H+ ions when added to water. this is known as pH value. if it is more, then we call that those acids are strong. strength of two acids can be compared by comparing their pH values