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Introduction to Acid, Base and Salts

Which of the ...

Question

Which of the following substances can be used to soften a sample of hard water?
(a) soap
(b) washing soda
(c) lime
(d) calcium carbonate

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Solution

(b) washing soda

Hard water can be softened by treating it with washing soda or sodium carbonate.

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Similar questions

Q. Consider the following statements.

(a) Potassium carbonate can be synthesised by Solvay process.

(b) Washing soda is used in softening of hard water.

(c) Crystals of sodium hydroxide are deliquescent.

The incorrect statement(s) is/are:`

Q. Assertion :Permanent hardness of water can be removed by using washing soda Reason: Washing soda reacts with soluble calcium and magnesium chlorides and sulphates in hard water to form insoluble carbonates

Q. Washing soda is used to soften hard water.

Q. Washing soda

(N a_{2} C O_{3} .10 H_{2} O)

is widely used in softening of hard water. If

1

L of hard water requires

0.0286

g of washing soda, the hardness of

C a C O_{3}

Q. Washing soda

(N a_{2} C O_{3} .10 H_{2} O)

is widely used in softening of hard water. If 1L of hard water requires 0.0143 g of washing soda, what is hardness of water in terms of ppm of

C a C O_{3}

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