Question

Three solutions P, Q and R have pH value of 3.5, 5.2 and 12.2 respectively. Which one of these is a:

1. Weak acid?
2. Strong alkali?

Answer 1

1. On a pH scale, acids have a pH less than 7, whereas weak acids have a pH closer to 7. Therefore, Q is a weak acid with a pH of 5.2.
2. On a pH scale, acids have pH less than 7 whereas weak acids have pH towards 7. Hence, Q will be a weak acid with pH 5.2.