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Reaction of Acids with Metal Carbonates and Bicarbonates

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Question

The chemical X is a hydroxide of a divalent metal. On treating this hydroxide with $C O_{2}$ , a milky white precipitate of Y is formed. The precipitate turns to colourless solution by the excess passage of $C O_{2}$ . This colourless solution again gives milky white precipitate 'Y' on heating. Identify X and Y and also give necessary equations.

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Solution

X is $C a {(O H)}_{2}$ and Y is $C a {C O}_{3}$
$C a {(O H)}_{2} {C O}_{2} - - \to C a {C O}_{3} + H_{2} O$ (insoluble)
X Y
$Y {C O}_{2} - --- \to E x c e s s C a {({H C O}_{3})}_{2}$ (soluble)

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Similar questions

16.8 g

X

4.4 g

(A)

that turned lime water milky was driven of together with

1.8 g

(B)

which condensed to a colourless liquid the solid that remained

(Y)

dissolved in water to give an alkaline solution, which with excess of

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(Z)

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Q. Read the following statements:
(i) A white amorphous powder (A) on strongly heating gives a colourless non-combustile gas (B) and solid (C).
(ii) The gas (B) turns lime water milky and turbidity disappear with the passage of excess of gas.
(iii) The solution (C) in dilute HCl gives a white precipitate with an aqueous solution of

K_{4} [F e (C N)_{6}]

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(iv) The solution of (A) gives a white precipitate (D) on pasiing

H_{2} S

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Compound (A) to (D) are identified as:
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Z n C O_{3}

C O_{2}

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If true enter 1, else enter 0.

20.02

g of white solid (X) was heated,

4.4

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1.8

g if a gas (B) which condenses to a colourless liquid. The solid (Y) that remained is dissolved in water to give an alkaline solution, with which excess barium chloride solution gave a white precipitate (Z). The precipitate effervesced with acid giving off carbon dioxide. Compound (A), (B) and (Y) are identified as:

C O_{2}

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If true enter 1, else enter 0.

A white amorphous powder (A) when heated gives a colourless gas (B), which turns lime water milky and the residue (C) which is yellow when hot but white when cold. The residue (C) dissolves in dilute HCl and the resulting solution gives a white precipitate on addition of potassium ferrocyanide solution. (A) dissolves in dilute HCl with the evolution of a gas which is identical in all respects with (B). The solution of (A) as obtained above gives a white precipitate (D) on addition of excess of

N H_{4} O H

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Q. A gas X is passed through water to form a saturated solution. The aqueous solution on treatment with silver nitrate gives a white precipitate. The saturated aqueous solution also dissolves magnesium ribbon with evolution of a colourless gas Y. Identify X and Y :

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