Name the compound whose one formula unit is associated with 10 water molecules how is it prepared? Give two examples uses of this compounds
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Answer:
washing soda Na2CO3. 10H2O
Preparation:
when baking soda is heated sodium carbonate, water and carbon dioxide are produced Sodium carbonate formed is dissolved in water and crystallized
washing soda uses are as follows
used for cleaning laundry
softening of hard water
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Answer: The compound is washing soda (Na2CO3.10H2O)
Explanation: washing soda is prepared in three steps
1) NaCl+H2O+CO2+NH3 = NH4Cl + NaHCO3
From products NaHCO3 is taken and then
2) 2NaHCO3 (on heating) = Na2CO3+H2O+CO2
3) Na2CO3 + 10H2O = Na2CO3. 10H2O
USES OF WASHING SODA-
1) It is used for removing permanent hardness of water.
2) It is used for manufacture of sodium compounds such as borax.
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