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A sample of H 2 S O 4 (density 1.787 g m L - 1 ) is labelled as 86% by weight. What volume (in mL) of this acid has to be used to make 1 L of 0.2 M H 2 S O 4 ? [Report your answer upto two decimal places.]

Correct answer

12.75

Step-by-step solution

H 2 S O 4 is 86% by weight So weight of H 2 S O 4 = 86 g Weight of solution = 100 g So volume of solution = 100 1.787 m L = 100 1.787 × 1000 L M H 2 S O 4 = 86 98 × 100 1.787 × 1000 = 15.68 Let V mL of this H 2 S O 4 are used to prepare 1 L of 0.2 M H 2 S O 4 . So mmoles of concentrated H 2 S O 4 = mmoles of dilute H 2 S O 4 So V × 15.68 = 1000 × 0.2 So V = 12.75 mL.

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