ChemistryChemical combinationJAMB
4 g of sodium hydroxide is dissolved in water to make 500 cm³ of solution. Find its concentration. (Na = 23, O = 16, H = 1)
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Answer: B. 0.2 mol/dm³
4/40 = 0.1 mol in 0.5 dm³; 0.1 ÷ 0.5 = 0.2 mol/dm³.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.