Which of the following relation(s) is/are true for alkaline solution? — Ionic Equilibrium Chemistry Question

💡 Solution & Explanation

For an alkaline solution, the concentration of hydroxide ions is greater than that of hydrogen ions ($[\text{OH}^-] > [\text{H}^+]$), which means $\text{pOH} < \text{pH}$. Thus, Option B is true and Option D is false. Since $\text{pH} + \text{pOH} = pK_w$, substituting $\text{pOH} < \text{pH}$ gives $2\text{pH} > pK_w$, or $\text{pH} > \frac{pK_w}{2}$ (Option A is true). Similarly, substituting $\text{pH} > \text{pOH}$ gives $2\text{pOH} < pK_w$, or $\text{pOH} < \frac{pK_w}{2}$ (Option C is true). Therefore, correct answer is A,B,C.