Write balanced chemical equations for the following:
Water is added to Sodium aluminate and heated

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Solution

Part A: Writing Given reaction
The reaction of a compound with water is known as hydrolysis.
On hydrolysis of Sodium aluminate ( $N a A l O_{2}$ ) in presence of heat, we get a precipitate of Aluminium hydroxide $(A l {(O H)}_{3})$ and Sodium hydroxide ( $NaOH$ ).
$N a A l O_{2} + H_{2} O ⟶ A l (O H)_{3} + N a O H S o d i u m A l u m i n i u m S o d i u m A l u m i n a t e H y d r o x i d e H y d r o x i d e$
Part B: Balancing Given reaction
Step 1 : Balancing the $H$ and $O$ atoms
The above equation is not balanced. Since there are four $H$ atoms on the product side and only two on the reactant side. Similarly, there are three oxygen atoms on the reactant side and four on the product so we write two before . $H_{2} O$ .
$N a A l O_{2} + 2 H_{2} O ⟶ A l (O H)_{3} + N a O H$
Step 2 : Balanced equation
Therefore, the balanced equation is:
$N a A l O_{2} + 2 H_{2} O ⟶ A l (O H)_{3} + N a O H$

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