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Acids, bases and salt
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05/09/2021 11:15 am
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When a piece of limestone reacts with dilute HCl, a gas X is produced. When gas X is passed through lime water then a white precipitate Y is formed. On passing excess of gas X, the white precipitate dissolves forming a soluble compound Z.
(a) What are X, Y and Z?
(b) Write equations for the reactions which take place :
- when limestone reacts with dilute HCl
- when gas X reacts with lime water to form white precipitate Y
- when excess of gas X dissolves white precipitate Y to form a soluble compound Z.
1 Answer
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05/09/2021 11:20 am
(a) X is carbon dioxide; Y is calcium carbonate; Z is calcium hydrogen carbonate.
(b) 1. CaCO3 + 2HCl → CaCl2 + H2O + CO2
2. Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)
3. CaCO3(s) + CO2(g) + H2O(l) → Ca(HCO3)2(aq)