a. 25.0ml of a solution of sodium hydroxide solution required 21.50ml of 0.100 mol sulphuric acid for neutralisation.
Find the concentration of the sodium hydroxide solution in mol/.

H₂SO₄aq+2 NaOH{aq}-----> Na₂SO₄{aq}+2 H₂O{l}

b. Find the volume of 1.2 mol/I hydrochloric acid that reacts with 25.00 cm³ of 1.50 mol /dm³ sodium hydroxide.

HCl{aq}+NaOH{aq} ------>NaCl{aq}+H₂O{l})

c. What volume of 0.040 mol/I calcium hydroxide just neutralises 25.0 ml of 0.100 mol/I nitric acid?
Ca(OH)₂(aq)+2 HNO₃{aq}------> Ca(NO3)₂{aq}+2 H₂O{l}