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Preparations and Uses of Caustic Soda

Which of the ...

Question

Which of the following pairs of substances cannot exist together in solution ?

N a_{2} C O_{3} + N a O H

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N a H C O_{3} + N a_{2} C O_{3}

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N a H C O_{3} + N a O H

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N a O H + N a C l

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Solution

The correct option is B $N a H C O_{3} + N a O H$
$N a H C O_{3}$ is a soluble salt of a weak acid, while $N a O H$ is a strong base so, they react and cannot exist together in a solution.
$N a H C O_{3} + N a O H \to N a_{2} C O_{3} + H_{2} O$

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\begin{matrix} 20 ml (1M) 30 ml (1M) H C l + N a O H ⟶ N a C l (P) + H_{2} O & (1) N=1/5 N a_{2} C O_{3} (Q) + H C l ⟶ N a C l (R) + H_{2} O & (2) M=2/5 N a H C O_{3} (S) + H C l ⟶ N a C l + H_{2} O + C O_{2} & (3) N=3/5 (4) NA \end{matrix}

N a_{2} C O_{3}

N a_{2} C O_{3} B a s e + H C l A c i d \to N a H C O_{3} + N a C l

2 N a C l + C a C O_{3} \to N a_{2} C O_{3} + C a C l_{2}

C a C O_{3} Δ - \to [A] + [B]

N a C l + N H_{3} + [B] + H_{2} O \to [C] + [D]

2 [C] \to N a_{2} C O_{3} + H_{2} O + [B]

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