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10-11-2017
Chemistry

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Calculate the quotient [co32–]/[hco3–] at ph 10.75.

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21-11-2017

The chemical equation is:

HCO3^ -> H^+ + CO3^2-

We know that the formula for Ka is:
Ka = [H^+][CO3^2-]/[HCO3^-]

log Ka = log[H^+] + log[CO3^2-]/[HCO3^-]
pKa = pH - log[CO3^2-]/[HCO3^-]
log[CO3^2-]/[HCO3^-] = pH - pKa = 10.75 - 10.329 = 0.421
[CO3^2-]/[HCO3^-] = Antilog (0.421) = 2.636

Answer:

2.636

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