Question

Which of the following sentences is true for a basic solution?

• A. For basic solution, \([\text{H}_3\text{O}^+] = [\text{OH}^-]\)
• B. In basic solution, the excess of \(\text{OH}^-\) ions are present.
• C. In the basic solution, there is excess of \(\text{H}_3\text{O}^+\) ions.
• D. The pOH of a basic solution can be calculated by pOH = \(-log[\text{H}^+]\)

Hint:

A basic solution has more hydroxide ions than hydronium ions.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Acidic, neutral and basic solutions are told apart by comparing \([\text{H}_3\text{O}^+]\) with \([\text{OH}^-]\).

Step 2: Check statement (A).
\([\text{H}_3\text{O}^+] = [\text{OH}^-]\) describes a neutral solution, such as pure water at 25 degrees C. So (A) is FALSE.

Step 3: Check statement (B).
In a basic solution \([\text{OH}^-] > [\text{H}_3\text{O}^+]\), so excess hydroxide ions are present. So (B) is TRUE.

Step 4: Check statement (C).
Excess \(\text{H}_3\text{O}^+\) is the definition of an acidic solution. So (C) is FALSE.

Step 5: Check statement (D).
The correct relation is \(\text{pOH} = -\log[\text{OH}^-]\). The expression \(-\log[\text{H}^+]\) is pH, not pOH. So (D) is FALSE.

Final Answer:
Only statement (B) is correct for a basic solution. \[ \boxed{\text{(B)}} \]