Chemistry
Related Questions
Complete and balance the equations:
Hard and Soft water a. Formation of temporary hard water CaCO3 + H2O + CO2 ⟶ ……………
MgCO3 + H2O + CO2 ⟶ ……………b. Removal of temporary hardness in water
- by boilingCa(HCO3)2 ⟶ …………… ↓ + …………… + …………… [g]
Mg(HCO3)2 ⟶ …………… ↓ + …………… + …………… [g]c. Removal of temporary hardness in water
- by addition of washing soda [Na2CO3]Na2CO3 + Ca(HCO3)2 ⟶ …………… ↓ + …………… d. Removal of permanent hardness in water
- by addition of washing soda [Na2CO3]Na2CO3 + CaSO4 ⟶ …………… ↓ + …………… How does an increase in temperature affect :
(i) the solubility of NaCl
(ii) the solubility of CaSO4 in water ?Give reasons for the following :
(i) table salt becomes moist and sticky during the rainy season.
(ii) a white powder forms on the surface of washing soda crystals which are left exposed to the air.
Why is anhydrous CaCl2 used in a desiccator. Name one substance which is 'efflorescent'.