Question

3 0.9 g ordinary sample of limestone is dissolved in 15 mL HCl which is prepared by diluting 10mL
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32% HCI with specific gravity 1.16 to 100mL. Calculate the percentage purity of limestone.
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(Ans: 84%)​

Answer 1

Answer:

0.5g of a sample of limestone was dissolved in 30mL of N/10 HCl and the solution diluted to 100mL. 25mL of this solution required 12.5mL of N/25 NaOH for complete neutralization. Calculate percentage of CaCO

3

in the example.