10 g of a sample of conc. hydrochloric acid (HCI) solution diluted with water, was added to a piece of marble (CaCO3) weighing 7.0 g. After completion of the reaction, 2.8 g of marble remained unreacted. What was the percentage strength of the conc. acid ? (H = 1; Cl = 35.5; Ca = 40; C = 12; 0 = 16)
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30.66 percent this is the answer
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