ChemistryAcids, bases and saltsWAEC
25.0 cm³ of 0.10 mol/dm³ sodium hydroxide is exactly neutralised by 20.0 cm³ of hydrochloric acid. Find the concentration of the acid.
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Answer: D. 0.125 mol/dm³
Moles of NaOH = 0.025 × 0.10 = 0.0025; the acid reacts 1 : 1, so its concentration = 0.0025/0.020 = 0.125 mol/dm³.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.