Advertisements
Advertisements
प्रश्न
Both temporary & permanent hardness in water can be removed by addition of washing soda. Give balanced equations for the same.
Advertisements
उत्तर
Using washing soda, removal of:
(i) Temporary hardness
\[\ce{\underset{\text{washinng soda}}{Na2CO3} +\underset{\text{temporary hardness}}{Ca(HCO3)2} -> CaCO3↓ + 2NaHCO3}\]
\[\ce{\underset{\text{washinng soda}}{Na2CO3} +\underset{\text{temporary hardness}}{ Mg(HCO3)2} -> MgCO3↓ + 2NaHCO3}\]
(i) Permanent hardness
\[\ce{\underset{\text{washing soda}}{Na2CO3} +\underset{\text{permanent hardness}}{CaSO4} ->Na2SO4 +\underset{\text{insoluable}}{CaCO3↓}}\]
\[\ce{\underset{\text{washing soda}}{Na2CO3} +\underset{\text{permanent hardness}}{MgCL2} -> \underset{\text{insoluable}}{MgCO3↓} + 2NaCl}\]
APPEARS IN
संबंधित प्रश्न
What causes the temporary and permanent hardness of water?
What are the causes for:
Temporary hardness
Using given sample of temporary and permanent hard water, soft water, ordinary soap, detergent and washing soda how would you distinguish between temporary hard water and permanent hard water?
State what are synthetic detergents. Explain experimentally how you will determine the advantage of synthetic detergents over soap using a sample of hard water.
Select the correct answer from the choice given in the options.
A substance which causes hardness in water _____.
Give a reason for the following.
Hard water is not good for washing utensils.
The pleasant taste of drinking water is due to the presence of a dissolved substance which includes air, CO2, and minerals.
Which water is hard?
Which water is soft?
1000 g aqueous solution of CaCO3 contains 10 g of calcium carbonate. Concentration of the solution is ______.
