MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Silicates

How does Na2C...

Question

How does Na₂CO₃ help in removing hardness of water?

Open in App

Solution

Permanent hardness in water can be removed by adding washing soda. This removes the hardness creating chloride and sulphate of Ca and Mg.
$M g C l_{2} + N a_{2} C O_{3} \to M g C O_{3} + 2 N a C l C a C l_{2} + N a_{2} C O_{3} \to C a C O_{3} + 2 N a C l M g S O_{4} + N a_{2} C O_{3} \to M g C O_{3} + N a_{2} S O_{4}$
Thus the soluble chloride and sulphate of Ca or Mg is converted as precipitate and is filtered.

Suggest Corrections

thumbs-up

0

Similar questions

Q. Washing soda helps in removing the permanent hardness of water.

Q. Permanent hardness is due to

S O_{4}^{2 -}

C l^{-}

C a^{2 +}

M g^{2 +}

and is removed by the addition of

N a_{2} C O_{3}

.

C a S O_{4} + N a_{2} C O_{3} ⟶ C a C O_{3} + N a_{2} S O_{4}

C a C l_{2} + N a_{2} C O_{3} ⟶ C a C O_{3} + 2 N a C l

100

C a C O_{3}

N a_{2} C O_{3}

required to soften

10

L of hard water is :

Q. What mass of

N a_{2} C O_{3}

is required to remove hardness in above problem.

10

L of hard water required

0.56

(C a O)

for removing hardness. Hence, temporary hardness in ppm of

C a C O_{3}

C a S O_{4}

causes permanent hardness in water. It can be removed by precipitating it as

C a C O_{3}

N a_{2} C O_{3}

. If the amount of

N a_{2} C O_{3}

required to soften 100 L of hard water, which is 200 ppm

C a C O_{3}

x

g, then value of

x

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Silicates

CHEMISTRY

Watch in App

explore_more_icon

Explore more

Standard XII Chemistry

Join BYJU'S Learning Program

CrossIcon