Chemistry

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Calculate the [H3O+] and pH of each polyprotic acid solution.
(b) 0.116 M H3C6H5O7

I did part (a) just fine, but for some reason can't figure (b) out. Can someone help me with just the [H3O+] part to get me started?
I already got 9.3e-3 and 1.4e-3 without success and only have one try left.
The Ka values according to the appendix given are Ka1=7.4x10-4, Ka2=1.7x10-5, Ka3=4.0x10-7.

Thank you so much.

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