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Hardness of Water and Treatment

The reaction ...

Question

The reaction that takes place in the Clarke's process is

Ca(HCO₃)₂→CaCO₃ + H₂O + CO₂

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2Ca(OH)₂ +Mg(HCO₃)₂→2CaCO₃ + Mg(OH)₂ + 2H₂O

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Na₂Si₂O₈ + CaCl₂→ CaSi₂O₈ + 2NaCl

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2RCOOH + MgCl₂→(RCOO)₂Mg + 2HCl

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Solution

The correct option is B
2Ca(OH)₂ +Mg(HCO₃)₂→2CaCO₃ + Mg(OH)₂ + 2H₂O

Calculated amount of Ca( $O H$ ) $_{2}$ is used in clarke's process

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Calcium carbonate reacts with aqueous HCl to give CaCl₂and CO₂according to the reaction, CaCO₃+ 2HCl --> CaCl₂+ H₂O

What mass of CaCO3 is required to react completely with 25mL of 0.75 HCl?

C a C O_{3} + 2 H C l \to C a C l_{2} + H_{2} O + C O_{2}

4.0

C a C O_{3}

C O_{2}

10

[C a (H C O_{3})_{2}]

0.56

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

C a C O_{3}

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