Q.

2.5 g of a mixture containing CaCO3,CaHCO32 and NaCl was dissolved in 100 mL water and its 10 mLportion required 10 mL 0.05 M H2SO4 solution to reach the phenolphthalein end Point Another 10 mL portion of the same stock solution required 32.35 mL of the same acid solution reach the methyl orange end point. Determine mass percentage ratio of CaCO3 and CaHCO3)2in the original mixture.

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Detailed Solution

Here,

For phenolphthalein end point,

2CaCO31+H2SO410×0.05=0.5CaHCO32+CaSO4

For methyl orange end point

CaCO31+H2SO41 m molCaSO4+H2O+CO2

CaHCO32+H2SO4(32.35×0.051)=6.175×101CaSO4+2H2O+2CO2 Ratio =1×1006.175×101×162=1

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2.5 g of a mixture containing CaCO3,CaHCO32 and NaCl was dissolved in 100 mL water and its 10 mLportion required 10 mL 0.05 M H2SO4 solution to reach the phenolphthalein end Point Another 10 mL portion of the same stock solution required 32.35 mL of the same acid solution reach the methyl orange end point. Determine mass percentage ratio of CaCO3 and CaHCO3)2in the original mixture.