calculate the poh of a 0.0200 m solution of hbr at 25.0 °c.

Explanation:

Step1: Identify $H^+$ concentration

HBr is a strong - acid, so $[H^+]=0.0200\ M$.

Step2: Calculate pH

$pH =-\log[H^+]=-\log(0.0200)= 1.70$.

Step3: Calculate pOH

At $25^{\circ}C$, $pH + pOH=14$. So $pOH = 14 - pH$. Substitute $pH = 1.70$ into the equation: $pOH=14 - 1.70 = 12.30$.

Answer:

$12.30$