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Characteristics of Chemical Equilibrium

A balanced eq...

Question

A balanced equation for the conversion of magnesium to magnesium hydroxide is given by :

A

{M g}^{2 +} + C a O + H_{2} O \to {C a}^{2 +} + M g {(O H)}_{2}

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B

2 {M g}^{2 +} + C a O + H_{2} O \to {C a}^{2 +} + 2 M g {(O H)}_{2}

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C

{M g}^{2 +} + C a O + 2 H_{2} O \to {C a}^{2 +} + 2 M g {(O H)}_{2}

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D

{M g}^{2 +} + 2 C a O + H_{2} O \to 2 {C a}^{2 +} + M g {(O H)}_{2}

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Solution

The correct option is A ${M g}^{2 +} + C a O + H_{2} O \to {C a}^{2 +} + M g {(O H)}_{2}$
${M g}^{2 +} + C a O + H_{2} O \to {C a}^{2 +} + M g {(O H)}_{2}$

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Similar questions

Q. Temporary hardness is due to

H C O_{3}^{-}

M g^{2 +}

C a^{2 +}

. It is removed by addition of

C a O

C a (H C O_{3})_{2} + C a O ⟶ 2 C a C O_{3} + H_{2} O

C a O

required to precipitate

2

C a C O_{3}

Q. Temporary hardness is due to bicarbonates of

M g^{2 +}

C a^{2 +}

. It is removed by addition of CaO as follows:

C a (H C O_{3})_{2} + C a O \to 2 C a C O_{3} + H_{2} O

Mass of CaO required to precipitate

2 g C a C O_{3}

Q. Temporary hardness is due to bicarbonates of

M g^{2 +}

C a^{2 +}

. It is removed by addition of CaO as follows:

C a (H C O_{3})_{2} + C a O \to 2 C a C O_{3} + H_{2} O

Mass of CaO required to precipitate

2 g C a C O_{3}

Q. Temporary hardness is due to

H C O_{3}^{-}

M g^{2 +}

C a^{2 +}

. It is removed by addition of

C a O

.

C a (H C O_{3})_{2} + C a O \to 2 C a C O_{3} + H_{2} O

C a O

(in g) required to produce

2

C a C O_{3}

precipitate is:

Following reaction is used to remove temporary hardness which is due to dissolved bicarbonates of

C a^{2 +}

M g^{2 +}

C a (H C O_{3})_{2} + C a (O H)_{2} \to 2 C a C O_{3} ↓ + 2 H_{2} O

Actually lime (

C a O

) is added which in

H_{2} O

C a (O H)_{2}

and precipitates

C a C O_{3}

C a O + H_{2} O \to C a (O H)_{2}

10

L of hard water requires

0.56

C a O

, temporary hardness of

C a C O_{3}

x \times 10^{2}

x

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