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HCl + NaOH ― NaCl + H2O
nNaOH = c*v
= 0.01470 * 23.74*10-3L
= 3.49*10-4 mol
1 mol HCl reacts with 1 mol NaOH
therefore
nHCl = 3.49*10-4mol
CHCL= nNaOH /VNaOH
= 3.49*10-4 / 25.00*10-3
= 13.96 * 10-3 mol.dm-3