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Q.

A sample of pure sodium carbonate 0.318 g is dissolved in water and titrated with HCI solution. A volume of 60 mL is required to reach the methyl orange end point. Calculate the molarity of the acid.

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a

0.4 M

b

0.2 M

c

0.1 M

d

None of these

answer is A.

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Detailed Solution

Na2CO3+2HCl⟶2NaCl+H2O+CO2

At the equivalent point m.mole of HCl 

=2 x m.mole of Na2CO3

60×M=2×0.318106×1000Mw of Na2CO3=106M=0.1

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A sample of pure sodium carbonate 0.318 g is dissolved in water and titrated with HCI solution. A volume of 60 mL is required to reach the methyl orange end point. Calculate the molarity of the acid.