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PART - 1 CH - 2 Acids, Bases and Salts — Science STD 10 — Question

Gujarat BoardEnglish MediumSTD 10SciencePART - 1 CH - 2 Acids, Bases and Salts4 Marks
Question
Write a short note on washing soda (Na2CO3.10H2O).
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Answer

Sodium carbonate is obtained by heating baking soda. Recrystallisation of sodium carbonate forms washing soda.
$2 NaHCO _3 \xrightarrow{\text { Heat }} \underset{\begin{array}{l}\text { Sodium } \\ \text { carbonate }\end{array}}{ Na _2 CO _3}+ H _2 O + CO _2$
$Na _2 CO _3+10 H _2 O \xrightarrow{\text { Recrystallisation }} \underset{\text { Washing soda }}{ Na _2 CO _3 \cdot 10 H _2 O }$
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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