Answer: if I want to use hard water for my textile dye processing fristy we need hardness of water.
water hardness are two type:
1)temporary hardness: temporary hardness is removed by boiling water and chemical reaction.
2)parmanent hardness: parmanent hardness is removed by only chemical reaction.
I given reaction of temporary hardness and parmanent hardness in the below:
Temporary hardness:
1. Ca(HCO3)2 + Ca(OH)2 → 2CaCO3 ↓ +2H2O
2. Mg(HCO3)2 + 2Ca(OH)2 → 2MgCO3 +2H2O
MgCO3 + Ca(OH)2 → Mg(OH)2 + CaCO3
Permanent Hardness:
- CaSO4 + Na2CO3 → CaCO3+ Na2SO4
2. MgSO
4 + Na
2CO
3 → MgCO
3+ Na
2SO
4 MgCO3 + Ca(OH)2 → Mg(OH)2 + CaCO3