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A standard solution of potassium hydroxide 0.050 mol dm-3 was used to determine the concentration of a hydrochloric acid solution. 25.00 cm3 of the acid reacted with 37.50 cm3 of the potassium hydroxide solution. Calculate the concentration of the hydrochloric acid. Suggested method: Write the balanced equation for the reaction Note the mole ratio of the two reactants Calculate the number of moles of potassium hydroxide in the titre (37.50 cm3 ) Consider the mole ratio and determine the number of moles of hydrochloric acid present in 25.00 cm3 and then the number of moles in 1000 cm3 which is the concentration of hydrochloric acid in mol dm-3
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