Friday
October 24, 2014

Homework Help: Chemistry

Posted by Lindsey on Monday, February 16, 2009 at 2:45pm.

i need help.
Calculate the pH of a 0.24 M CoCl3 solution. The Ka value for Co(H2O)63+ is 1.0 10-5.

how do u do these with like the Cl there?


Responses


Chemistry - DrBob222, Monday, February 16, 2009 at 12:35am
Just ignore the Cl^-.
Co(H2O)6Cl3 ==> Co(H2O)6^+3 + 3Cl^-
Then the hexaaquocobalt(III) ion ionizes as (and I will write this a funny way to help you see it).
Co(H2O)6^+3 ==>Co(H2O)5(H2O)^+3==> Co(H2O)5(OH)^+2 + H^+.
Then you write the Ka expression for that last part and solve for H^+ after doing an ICE chart.




i did wat dr. bob said to do and i got a pH of 1.31

what did i do wrong?

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Chemistry - i need help. Calculate the pH of a 0.24 M CoCl3 solution. The Ka ...
CHEm 1442 - Calculate the pH of a 0.21 M CoCl3 solution. The Ka value for Co(H2O...
AP Chemistry - calculate the ph of a 0.10 M CoCl3 solution. The ka value for Co(...
Chemistry 102 - For a question like “calculate the pH of an aq.solution that is ...
chemistry - A sample containing 0.0500mol of Fe2(SO4)3 is dissolved in enough ...
general chemistry - I've been trying to solve these for while now, and i keep ...
Chemistry - Determine the boiling point elevation of H2O in the following ...
chemistry - Calculate the value of [H3O+] in a 0.01 M HOBr solution. Ka = 2.5E-9...
AP Chemistry - A 1.2M NaOCl solution is prepared by dissolving solid NaOCL in ...
chemistry - Calculate the volume (mL) of the solute (CH3)2CO and the volume (L) ...

Search
Members