Answer:
To find the pOH of a solution, we need to use the formula:
pOH = -log[OH-]
where [OH-] is the hydroxide ion concentration in mol/L.
In this case, the hydroxide ion concentration is given as 9.45x10^-12 M for KOH. Therefore:
pOH = -log(9.45x10^-12) = 11.0255
Rounding to 4 significant figures:
pOH = 11.03
To determine whether the solution is acidic or basic, we can use the relationship between pH, pOH, and the neutral point:
pH + pOH = 14
At 25°C, a neutral solution has a pH of 7. If the pOH is greater than 7, the solution is acidic. If the pOH is less than 7, the solution is basic.
In this case, the pOH is 11.03, which is greater than 7. Therefore, the solution is acidic.