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In: Chemistry

Calculate the concentration of all species in a 0.135 M solution of H2CO3. Enter your answers...

Calculate the concentration of all species in a 0.135 M solution of H2CO3. Enter your answers numerically separated by commas. Express your answer using two significant figures.

Expert Solution

H2CO3 --------> H+ + HCO3-

intial 0.135 0 0

at equli (0.135 - x) x x

Ka = [H+] [HCO3 -] / [H2CO3]

Ka = (x) *(x) / (0.135 - x) = 4.35 * 10^-7

x = 2.421 * 10^-4 = [H+] = [HCO3-]

HCO3 - ----------> H+ + CO3 2-

initi (2.4321 * 10^-4) 0 0

at equi ((2.4321 * 10^-4) - x) x x

Ka = [H+] [CO3 2-] / [HCO3-]

Ka = (x)*(x) / ((2.4321 * 10^-4) - x) = 4.7 * 10^-11

x = 1.0689 * 10^ -7 = [H+] = [CO3 2-]

concentration of H2CO3 = (0.135 - 2.421 * 10^-4) = 0.13

Concentration of H= = (2.421 * 10^-4) + (1.0689*10^-7) = 2.4 * 10^-4

Concetration of HCO3 - = (2.4231 * 10^-4 - 1.0689*10^-7) = 2.4 * 10^-4

Concentration of CO3 2- = 1.07 * 10^-7

queen_honey_blossom answered 2 years ago

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