# Chemistry(Please help)

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Calculate the concentration of HCO3- in an aqueous solution of 0.0885 M carbonic acid, H2CO3 (aq).

I was going to set this up as 0.0885 -x = ? Am I suppose to use the Ka value for carbonic acid?

• Chemistry(Please help) -

Yes, k1 for carbonic acid.

• Chemistry(Please help) -

0.0885 - x = 4.2e-7

Then I added 0.0885 to the right side and got 8.85e-2. Would this be the concentration or do I need to do another step?

• Chemistry(Please help) -

You need another step.
H2CO3 --> H^+ + HCO3^-
.0885-x...x......x

k1 = (H^+)(HCO3^-)/(H2CO3)

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