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  4. Excess of carbon dioxide is passed through 50 mL of 0.5 M calcium hydroxide solution. After the completion of the reaction, the solution was evaporated to dryness. The solid calcium carbonate was completely neutralised with 0.1 N Hydrochloric acid. The volume of Hydrochloric acid required is (At. mass of calcium = 40)

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Q. Excess of carbon dioxide is passed through $50 \,mL$ of $0.5\, M$ calcium hydroxide solution. After the completion of the reaction, the solution was evaporated to dryness. The solid calcium carbonate was completely neutralised with $0.1\, N$ Hydrochloric acid. The volume of Hydrochloric acid required is (At. mass of calcium = $40$)

KCETKCET 2009Some Basic Concepts of Chemistry

Solution:

No. of millimoles of $Ca ( OH )_{2}=50 \times 0.5=25$

No. of millimoles of $CaCO _{3}=25$

No. of milliequivalents of $CaCO _{3}=50$

$\therefore $ Volume of $0.1 \,N HCl =\frac{50}{0.1}=500 \,cm ^{3}$