Question

Calculate the concentration of bicarbonate ion, hco3-, in a 0. 010 m h2co3 solution that has the stepwise dissociation constants ka1 = 4. 3 × 10-7 and ka2 = 5. 6 × 10-11

Answer 1

The concentration of bicarbonate ions is mathematically given as

H2CO3^- =9.27*10^{-5}m

What is the concentration of bicarbonate ions?

Question Parameters:

HCO3-, in a 0. 010 m H2CO3 solution that has the stepwise dissociation constants

ka1 = 4. 3 × 10-7 and

ka2 = 5. 6 × 10-11

Generally, the equation for the Chemical Reaction is mathematically given as

H2CO3 ----><----HCO3^-+H+

Therefore

$Ka1=\frac{HCO3^- +H^+}{H2CO3}$

$Ka1=\frac{ca.ca}{c(1-a)}$

ca=HCO3^-

$ca=\sqrt{4.3*10^{-7}*0.02}$

HCO3^-=9.27*10^{-5}m

On the second ionization of carbon

H2CO3 ----><----CO3^2-(aq) + H+(aq)

Where

1-a=1+a=1

In conclusion, the concentration of bicarbonate ions is

H2CO3^- =9.27*10^{-5}m

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