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Standard X

Chemistry

Family of Salts

A compound A ...

Question

A compound A is strongly heated to get compound B and gas C .When compond B reacted with water ,compound D is obtained .When C is passed through D,white ppt of compound A is formed again.When more of C is passed through aqueous solution of compound A,it dissolves to form compound E .Identify the compond A ,it dissolves to form compound E.
Identify the compounds A,B,C,D,E

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Solution

Compound A is calcium carbonate. When it is heated following compounds are formed:
$C a C O_{3} \overset{∆}{\to} C a O + C O 2 (g) (A) (B) (C)$

Calcium oxide (B) forms calcium hydroxide (D) when reacted with water.
$C a O + H_{2} O \to C a (O H)_{2} (C) (D)$

When CO₂ (C) is passed through calcium hydroxide (D), calcium carbonate is formed (A).
$C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O (D) (C) (A)$

When more of CO₂ (C) is passed through aqueous solution of CaCO₃ (A), it dissolves to form calcium bicarbonate, Ca(HCO₃)₂ (E )
$C O_{2} + C a (O H)_{2} \to C a C O_{3} + H_{2} O C a C O_{3} + H_{2} O + C O_{2} \to C a (H C O_{3})_{2} (E)$

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