A 0.500 M HNO3 solution was used to titrate a 21.15 mL KOH solution. The endpoint was reached after 22.30 mL of titrant were delivered. Find the molar concentration of KOH in the original solution.

Answer 1

To solve for the molar concentration of KOH in the original solution, we can use the neutralization equation and the formula for moles and molar concentration.

Neutralization Equation:
HNO3 + KOH → KNO3 + H2O

Moles of HNO3 in titration = Moles of KOH in the original solution
(0.500 mol/L HNO3) * (0.0223 L HNO3) = moles of KOH
0.01115 mol = moles of KOH

Now we can find the molar concentration of KOH using its moles and the volume of the original solution (21.15 mL):
Molarity of KOH = moles of KOH / volume of KOH solution in L
Molarity of KOH = 0.01115 mol / 0.02115 L = 0.527 mol/L

So the molar concentration of KOH in the original solution is 0.527 mol/L.