5 Using the Cr value from the below graph find the concentra

5. Using the Cr value from the below graph find the concentrations of [HCO;]. ICO], [OH], and H at pH 7.5 and 11 by both from graph (no need to draw the graph) and from equations. (20 points) pH 0 23478D 10 11 12 13 1 H2CO HCO, IHCO, 1 IOH 10 12

Solution

PH=7.5

H⁺XOH^-=10^-14

H⁺=10^-7.5

OH^-=10^-14/10^-7.5

=10^-6.5

HCO^3-=10^(-11.24+pH)=10^(11.24+7.5)=10^(-3.74)

HCO3 ^- CO₃^-2 + H⁺

CO₃^2-=10^(-6.5)

PH=11

H⁺XOH^-=10^-14

H⁺=10^-11

OH^-=10^-14/10^-11

=10^-3

HCO^3-=10^(-11.24+pH)=10^(11.24+11)=10^(-0.24)

HCO3 ^- CO₃ ^-2 + H⁺

CO₃^2-=10^(-3)