Question

Five solutions $A,B,C,D$ and $E$ when tested with universal indicator showed pH as $4,1,11,7$ and $9$, respectively. Which solution is:

(b) strongly alkaline?
(c) strongly acidic?
(d) weakly acidic?
(e) weakly alkaline?

Arrange the pH in increasing order of hydrogen-ion concentration.

Answer 1

a) $D$ is neutral, as its $pH$ value is equal to 7

b) $C$ is strongly alkaline, as its $pH$ value is 11.

c) $B$ is strongly acidic, as its $pH$ value is equal to 1

d) $A$ is weakly acidic, as its $pH$ value is equal to 4 and more than solution $B$.

e) $E$ is weakly alkaline, as its $pH$ value is equal to 9 and less than $C$.

$pH$ value of the given solution in increasing order of hydrogen-ion concentration: $11<9<7<4<1$