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Balanced Chemical Equation

Write a balan...

Question

Write a balanced chemical equation when sodium reacts with a hydrochloric acid to produce sodium chloride solution and water.

N a O H (a q) + H C l (a q) \to N a C l (a q) + H_{2} O (l)

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2 N a O H (a q) + H C l (a q) \to 2 N a C l (a q) + H_{2} O (l)

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N a O H (a q) + 2 H C l (a q) \to N a C l (a q) + 2 H_{2} O (l)

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N a C l (a q) + H C l (a q) \to N a C l (a q) + H_{2} O (l)

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Solution

The correct option is A $N a O H (a q) + H C l (a q) \to N a C l (a q) + H_{2} O (l)$
$H C l (g) w a t e r - -- \to H^{+} (a q) + {C l}^{-} (a q)$

As $H C l$ gives $H^{+}$ in water, it is an acid. (Arrhenius Theory)

$N a O H (s) w a t e r - -- \to {N a}^{+} (a q) + {O H}^{-} (a q)$

As $N a O H$ gives $O H^{-}$ in water, it is a base. (Arrhenius Theory)

Hence it is a neutralisation reaction.

$N e u t r a l i s a t i o n e q u a t i o n$ :
Acid + Base $\to$ Salt + water

The reaction is taking place in water. Hence, the physical state will be aqueous.
So, net equation will be:

$N a O H (a q) + H C l (a q) \to N a C l (a q) + H_{2} O (l)$

Hence, the option $(A)$ is correct.

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