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Grade: 12
        
PH of solution containing 0.2M H2CO3 and 0.1M CO2- is 
(for  H2CO3  k1 =4*10-7and k2=4*10-11.)
 
one month ago

Answers : (1)

Vikas TU
8729 Points
							
Dear student 
Dissociation constant of n acid is the rati of its molar concentrations 
[H+][A-]/[HA]=Ka
On the case of your question,
[H+][CO3^2-]/[HCO3-]=4×10^(-7) , so
[H+]=([HCO3-]/[CO3^2-])×4×10^(-7)=2.0×4×10^(-7)=8×10^(-7) .
pH=-log([H+])=-log(8.0×10^(-7)) => aproximately equal to 6.40
one month ago
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