Answer to Question #1395 in Chemistry for tami

Question

What is the concentration of a solution of sodium hydroxide, 25.0 cm3 of which requires 20.0 cm3 of hydrochloric acid of concentration 0.100mol/dm3 for neutralization?

Answer 1

NaOH + HCl = NaCl + H₂O
M(HCl ) = 20x10^-3[dm³] * 0.1 [mol/dm³] = 20x10^-4 mol
M(NaOH) = M(HCl) = 20x10^-4 mol
N (NaOH) = 20x10^-4 mol / 25x10^-3 dm³ = 0.08 mol/dm³.