Question

Which of the following has the highest $pH$?

• A. Distilled water
• B. $1MN{H}_3$
• C. $1MNaOH$
• D. Water saturated with chlorine

Answer 1

The correct option is C

$1MNaOH$

Explanation of correct option:

Option C:

• We know that the $pH$ works at the temperature of $25°C$.
• The Sodium hydroxide$\left(NaOH\right)$ has the highest $pH$ because it is the strongest base among all the given solutions.
• It completely dissolves in the aqueous solution and produces more Hydroxide ion ($O{H}^{-}$) which is responsible for its alkaline nature of $NaOH$.
• Its $pH$ is closer to $14$ at $25°C$.

Explanation of incorrect option:

Option A:

• Almost neutral behavior is produced by the distilled water. So, its $pH$ can't be highest.

Option B:

• Ammonia$\left(N{H}_3\right)$ is weak base so its $pH$ can't be as high as $NaOH$.

Option D:

• Saturated water with chlorine is acidic in nature so its $pH$ will be less than $7$.

Hence option C is correct