Question

A sample of NaHCO3​+Na2​CO3​ required 20 ml of HCl using phenolphthalein as indicator and 35 ml more required if methyl orange is used as indicator. Then molar ratio of NaHCO3​ to Na2​CO3​ is?

Answer 1

A sample of NaHCO3+Na2CO3 required 20 ml of HClusing phenolphthalein as indicator and 35 ml more required if methyl orange is used as indicator. Then molar ratio of NaHCO3 to Na2CO3 is?

A .

21

B .

32

C .

43

D .

31

December 27, 2019Sourabh Madiraju

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ANSWER

Na2CO3+HCl⟶NaHCO3+Nacl(Phenolpthalein)

Let us assume, [HCl]=0.1M

Since, 1 mole of Na2CO3 react with one mole of HCl i.e., no. of moles of both will be same.

No. of moles of HCl=molarity×volume(L)

=0.1×100020

=0.1×0.02=0.002 moles

no. of moles of HCl=no. of moles of Na2

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