Chemistry Question on Acids and Bases

Question

Which among the following has highest pH?

Answer 1

Solution

The pH scale measures the acidity or alkalinity of a solution. A higher pH value indicates a more alkaline or basic solution, while a lower pH value indicates a more acidic solution. Among the options provided:
(A) 1 M H 2SO4: Sulfuric acid (H2SO4) is a strong acid and has a low pH. It is highly acidic.
(B) 1 M HCl: Hydrochloric acid (HCl) is also a strong acid and has a low pH. It is highly acidic.
(C) 0.1 M NaOH: Sodium hydroxide (NaOH) is a strong base and has a high pH. It is alkaline.
(D) 1 M NaOH: Sodium hydroxide (NaOH) is a strong base and has a high pH. It is alkaline.
Comparing options (C) and (D), both solutions contain the same base, sodium hydroxide (NaOH), but option (D) has a higher concentration (1 M) compared to option (C) (0.1 M). Since pH is a logarithmic scale, a higher concentration of a strong base will result in a higher pH value.
Therefore, option (D) 1 M NaOH has the highest pH among the given options.