Co(H2O)6^+3 ==> [Co(H2O)5(OH^-)]^+2 + H^+
Write the Ka expression.
Substitute x for H^+ and the Co compound on the right and 0.21-x for the Co compound on the left. Solve for x which will be (H^+), then convert to pH.
Calculate the pH of a 0.21 M CoCl3 solution. The Ka value for Co(H2O)63+ is 1.0 10-5.
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