(i)Name the compound which is obtained from baking soda and is used to remove permanent hardness of water. (ii) Write its chemical formula (iii) What happens when it is re-crystallized from its aqueous solution? 

1) Washing soda used to remove permenant hardness of water is obtained from baking soda 2) Chemical Formula - Na2CO3.10H2O 3) Anhydrous Sodium carbonate becomes hydrated when it is re crystallised from its aqueous solution . Hope it helps . Cheers!!

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a. washing soda
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b. Na2CO3 .10H2O
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  1. Washing soda is used for removing permanent hardness of water and obtained by recrystillisation of baking soda
  2. Na2CO3.10H2O
  3. Washing soda will be produced.
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i) Washing soda
ii) Na2CO3.10H2O
iii)Na2COis formed
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washing soda na2co3.10h2o
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