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  1. Tardigrade
  2. Question
  3. Chemistry
  4. A 2.0g sample of a mixture containing Na2CO3,NaHCO3andNa2SO4 is gently heated till the evolution of CO2 stops. The evolved CO2 has volume of 123.9mL measured at 750mmHg pressure and 298K . 1.5g of the same sample is completely neutralised by 150mL of 0.1MHCl . The percentage composition of textNa2 textSO4 in the original mixture is:

Q. A sample of a mixture containing is gently heated till the evolution of stops. The evolved has volume of measured at pressure and .
of the same sample is completely neutralised by of . The percentage composition of in the original mixture is:

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Solution:

In 2g sample CO2 Liberated
Moles of CO2
= 5 x 10-3
moles = 5 mM of NaHCO3 in mixture
Moles of NaHCO3 in 2g sample = 2 x 5 x 10 mM
1.5g sample of HCl
2.0g sample
20 mM HCl will be utilised by
10 mM


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