At 40 °C, the ion-product constant of water is . A student dissolves 5.00 g of (molar…

CHEMISTRY · Single correct · CBSE · Chemistry · Equilibrium · Equilibrium

Problem

At 40 °C, the ion-product constant of water is

K_w = 2.92 \times 10^{-14}

. A student dissolves 5.00 g of

\mathrm{KOH}

(molar mass 56.11 g mol

^{-1}

) in enough water to make 750.0 mL of solution at this temperature. Assuming complete dissociation, what is the pH of the solution at 40 °C? (a)

13.08

(b)

12.49

(c)

12.61

(d)

12.95