A compound x is a constitutent of baking powder. it is used as an antaacid . where x is heated it gives out a gas Y which when passed through lime water turns it milky and salt Z is formed which isthe main constitutent of washing powder . Identify the X Y Z write balanced chemiccal equations for the reactions involved.

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Solution

Compound X is sodium bicarbonate, NaHCO₃

on heating sodium bicarbonate forms sodium carbonate, water and carbondioxide

the equation is as follows...

1.NaHCO₃-------> Na₂ CO ₃+ H₂O + CO₂

therefore Z is sodium carbonate and the gas Y evolved is carbondioxide.

Sodium carbonate after recrystallization gives sodium washing soda which is used to remove hardness of water. The equation can be written as follows..

2. Na₂CO₃+10H₂O --------------> Na₂CO₃.10H₂O

When carbondioxide(gas Y) Is passed though lime water it turns milky the equation can be written as follows..

3.Ca(OH)₂ + CO₂ ---------> CaCO₃+H₂O

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