Question

50mL of potassium hydroxide (KOH) solution contains 7 grams of potassium hydroxide.
What is the molarity (mol/L) of the potassium hydroxide solution?
Given the atomic masses:
K = 39, O = 16 and H = 1

Answer 1

Answer:
Number of moles of potassium hydroxide = mass/ MW = 7g / 56 g/mole = 0.125 moles
Molarity of the solution = Number of moles of potassium hydroxide / Volume of solution = 0.125 moles / 0.05 L = 2.5 mol/L