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Chem

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calculate pH of the buffer solution prepared by mixing 10 mL of 1.5 M HCl with 100 mL of 0.1 M K2CO3 solution. For H2CO3: Ka1= 4.46 e^-7, Ka2= 4.69e^-11

  • Chem -

    pH = pKa + log(B/A)
    mols K2CO3 = M x L.
    mols HCl = M x L.
    Calculate mols K2CO3 initially.
    Calculate mols HCl initially.
    I think you will find that one H ion has been added to the CO3^=, and you are half way between CO3^= and H2CO3 meaning that CO3^= and H2CO3 are the same.
    Therefore, log B/A = log 1 = 0 and pH = pKa1.
    Post any work if you have questions.

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