Answer to Question #92442 in Chemistry for Tj

Question

What is the pH of a sodium hydroxide solution at 25 oC in which the hydroxide ion concentration is 0.0026 mol/L? Is the solution acidic or basic?

Answer 1

According to the pH concept:

pOH = -log[OH^-]

As [OH^-] = 0.0026 mol/L:

pOH = -log[0.0026] = 2.585

As pH + pOH = 14:

pH = 14 - pOH = 14 - 2.585 = 11.415 - the solution is basic as its pH is >7.

Answer: 11.415