Question
Write a short note on washing soda $\left( Na _2 CO _3 \cdot 10 H _2 O \right)$.
✓
Answer
- Sodium carbonate is obtained by heating baking soda. Recrystallisation of sodium carbonate forms washing soda.
- $2 NaHCO _3 \xrightarrow[\rightarrow]{\text { heat }} Na _2 CO _3+ H _2 O + CO _2$
- Sodium carbonate
- $Na _2 CO _3+10 H _2 O \underset{\rightarrow}{\text { Recrystallisation }} Na _2 CO _3 .10 H _2 O$
- Washing soda
- Washing soda is a basic salt.
- Uses:
- $(1)$ It is useful in the manufacture of glass, soap.
- $(2)$ It is used in the manufacture of sodium compounds such as borax.
- $(3)$ It is used as a cleansing agent for domestic purposes.
- $(4)$ It is used for removing permanent hardness of water.
- $(5)$ In paper and textile industries.
- $(6)$ As a reagent in laboratory.
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