Question

What would be the resulting molarity of a solution made by dissolving 25.4 grams of KOH in enough water to make a 985-milliliter solution? Show all of the work needed to solve this problem.

Answer 1

Hey there !

Molar mass KOH = 56.1056 g/mol

1) Number of moles :

n = m / mm

n = 25.4 / 56.1056

n =0.452 moles

Volume in liters :

985 mL / 1000 => 0.985 L

Therefore:

M = n / V

M = 0.452 / 0.985

=> 0.458 M