The hydronium ion concentration of an aqueous solution of 04

The hydronium ion concentration of an aqueous solution of 0.405 M trimethylamine (a weak base with the formula (CH3)3N) is.. [H3O+] = .405 XM

Solution

                       (CH3)3N + H2O -----------> (CH3)3NH^+ (aq) + OH^- (aq)

I                        0.405                                        0                          0

C                        -x                                             +x                          +x

E                    0.405-x                                         +x                        +x

                         Kb   = [(CH3)3NH^+][OH^-]/[(CH3)3N]

                        6.4*10^-5   = x*x/0.405-x

                        6.4*10^-5 *(0.405-X) = X^2

                             X = 0.005

                   [OH^-]   = x   = 0.005M

                [H3O^+]    = Kw/[OH^-]

                                = 1*10^-14/0.005    = 2*10^-12M

HCOOH is formic acid

             HCOOH + H2O -------------> CH3COO^- + H3O^+

           Ka   = 1.8*10^-4

            Kb    = 1*10^-14/1.8*10^-4

                   = 5.6*10^-11

Ammonium chloride is acidic nature due to cationic hydrolysis PH less than 7

barium cyanide is basic nature due to anionic hydrolysis PH is greater than 7

calciul perchlorate is acidic nature due to cationic hydrolysis PH less than 7

sodium chlorite is basic nature due to anionic hydrolysis PH is greater than 7