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Temporary Hardness and Removal

Give formula ...

Question

Give formula for lime stone, baking soda, milk of lime, plaster of paris, common salt and similar items

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Solution

Limestone - CaCO₃
Baking Soda - NaHCO₃
Milk of Lime - Ca(OH)₂
Plaster of Paris - CaSO₄.1/2H₂O
Common salt - NaCl

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Question 47
Write the formulae for the following and calculate the molecular mass for each one of them

(a) Caustic potash

(b) Baking powder

(c) Lime Stone

(d) Caustic soda

(e) Ethanol

(f) Common salt

Q. Common salt besides being used in kitchen can also be used as the raw material for making:
(i) washing soda
(ii) bleaching powder
(iii) baking soda
(iv) slaked lime

Q. The correct order of increasing

p H

values of the aqueous solutions of baking soda, rock salt, washing soda and slaked lime is:

Q. Fill in the following blanks:
(a) Common salt is obtained from sea-water by the process of.............
(b) Rock salt is mined just like ......................
(c) Chemical formula of washing soda is ..................
(d) Sodium hydrogen carbonate is .................. soda whereas sodium carbonate is ................. soda.
(e) The chemical formula of plaster of Paris is ............

Q. Match the following and identify the correct option.

(a)	Baking soda	(i)	$C a (O H)_{2}$
(b)	Slaked lime	(ii)	$C a O$
(c)	Quick lime	(iii)	$N a_{2} C O_{3}$
(d)	Soda ash	(iv)	$N a H C O_{3}$

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