H2M <-- --> HM- + H+
0.1__________0____0_
0.1-X________X____X_

Ka1 = 1.42*10^-3 = X^2 / (0.1-X)

=> X = [H+] = 0.0120

=> pH = 1.92

=> [H2M] = 0.1-X = 0.088M

***
[H+] = (Ka1*Ka2)^(1/2) = 5.34*10^-5

PH = 4.27

[H2M] = 0.1 * [H+]^2 / ([H+]^2 + Ka1*[H+] + Ka1*ka2) = 3.52*10^-3M

***
M-- + H2O <-- --> HM- + OH-
0.1______________0_____0_
0.1-X____________X_____X_

Ki = kw/Ka2 = 4.98*10^-9 = X^2 / (0.1-X)

=> X = 2.23*10^-5 = [OH-]

pOH = 4.65

pH = 9.35

=> [H+] = 10^-9.35

e [H2M] = 0.1 * [H+]^2 / ([H+]^2 + Ka1*[H+] + Ka1*ka2) = 7.04*10^-12M