Question

What do you understand by
(a) Soft water and Hard water-
c) Temporary Hard water (d) Permanent hard water.
. What are the causes for
(a) Temporary hardness (b) Permanent hardness
What are the advantages of (i) soft water (ii) hard water?
What are stalgmites and stalactites. How are they formed ?
Name the substances which make water (i) temporary hard
(ii) permanet hard.com
hard. Calcium
Give equations to show what happens when temporary hard
water is
bolledo Calot Hot con​

Answer 1

Answer:

option d is the correct answer

Answer 2

Answer:

1) [a]. The main difference between hard and soft water is the mineral content. Minerals commonly found in hard water are chalk, lime, calcium, and magnesium.

1)[b].Rain water is naturally soft but picks up these minerals as it runs through the ground.

1) [c].Temporary hard water is hard water that consists primarily of calcium (Ca2+) and bicarbonate (HCO3-) ions. Heating causes the bicarbonate ion in temporary hard water to decompose into carbonate ion (CO32-), carbon dioxide (CO2), and water (H2O).

1)[d]. Permanent hard water consists of high concentrations of anions, like the sulfate anion (SO42-). This type of hard water is referred to as "permanent" because, unlike temporary hard water, the hardness cannot be removed simply by boiling the water and thereby precipitating out the mineral ions.

2)[a]. Temporary hardness is a type of water hardness caused by the presence of dissolved bicarbonate minerals (calcium bicarbonate and magnesium bicarbonate). The presence of the metal cations makes the water hard.

2) [b]. Permanent hardness of water is caused when chlorides and sulfides of calcium and magnesium are dissolved in water. It is known as permanent hardness because it cannot be removed by boiling.

3)The advantages of soft water are that it feels soft to the touch and doesn't damage appliances as much as hard water, due to a low mineral composition, thereby extending the life of your plumbing. It's much better for your hair and skin, leading to a reduction in dryness and skin outbreaks.

4) Stalactites grow down from the cave ceiling, while stalagmites grow up from the cave floor. ... As the carbon dioxide is released, calcite is precipitated (redeposited) on cave walls, ceilings and floors. As the redeposited minerals build up after countless water drops, a stalactite is formed.

5) Hard water contains dissolved magnesium and calcium ions. These make it more difficult for the water to form a lather with soap. Temporary hardness is caused by dissolved calcium hydrogencarbonate (which is removed by boiling). Permanent hardness is caused by dissolved calcium sulfate (which is not removed by boiling).

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