ChemistryChemical combinationJAMB
What mass of sodium hydroxide is needed to prepare 250 cm³ of a 0.2 mol/dm³ solution? [Na = 23, O = 16, H = 1]
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Answer: A. 2.0 g
Moles = 0.25 × 0.2 = 0.05; mass = 0.05 × 40 = 2.0 g.
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