Question:

Na2CO3 is prepared by Solvay process but K2CO3 can not be prepared by the same because

Updated On: Apr 11, 2025
  • K2CO3 is highly soluble in H2O
  • KHCO3 is slightly soluble
  • KHCO3 is appreciably soluble 
  • KHCO3 decomposes
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The Correct Option is C

Solution and Explanation

The correct answer is option (C): KHCO3 is appreciably soluble

Explanation: 

KHCO3 (Potassium bicarbonate) is more soluble than NaHCO3 (Sodium bicarbonate). This is because:

  • The electropositive character increases as we move down the group in the periodic table.
  • This leads to an increase in the stability and solubility of the bicarbonates.

NaHCO3 is prepared by saturating a solution of sodium carbonate with carbon dioxide:

$\text{Na}_2\text{CO}_3 + \text{H}_2\text{O} + \text{CO}_2 \rightarrow 2\text{NaHCO}_3$

The white crystalline powder of NaHCO3 separates out because it is less soluble than KHCO3.

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Concepts Used:

Haloalkanes and Haloarenes - Chemical Reactions

Chemical Reactions go with the breaking and bonding of covalent bonds which involve of exchange of electrons. The functional groups of Organic compounds play a consequential role in the process. Based on the above theory, reactions can be classified into five main groups:

Rearrangement Reactions are the type of reactions in which products get formed simply by the rearrangement of atoms and electrons in the reactant molecules.

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NH4CNO → NH2 –C – NH2

Substitution Reactions are the reactions in which an atom or group of atoms is replaced by some other atom or group of atoms without any change in the structure of the remaining part of the molecule.

CH3Br + KOH (aqueous) → CH3OH + KBr

Addition Reactions are the reactions in which products get formed by the addition of some reagent to an unsaturated compound.

CH2 = CH2 + HCl → CH5Cl

  • Electrophilic Addition Reactions
  • Nucleophilic Addition Reactions
  • Free Radical Addition Reactions

Elimination Reactions are the reactions in which the products get formed by the loss of simple molecules like HX from the reactant molecules.

C2H5OH → C2H4

  • EN1 (Nucleophilic Elimination Unimolecular)
  • EN2 (Nucleophilic Elimination Bimolecular)

A polymerization Reaction is the union of two or more molecules of a substance that form a single molecule with higher molecular weight.

n (CH = CH2) → (-CH2 – CH2 -) n