March 29, 2017

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Calculate the pH, to one decimal place, of the solution made by mixing 21.0 mL of 0.33 M HNO3 with 121.0 mL of 0.32 M formic acid (HCOOH)

  • Chemistry - ,

    HNO3 is a strong acid.
    HCOOH is a weak acid.
    Therefore, the final H^+ concn will be that of HNO3 + that from HCOOH.

    You know the H^+ from HNO3 since that is a strong acid. That H^+ will act as a common ion to HCOOH.
    HCOOH ==> H^+ + HCOO^-
    Ka = (H^+)(HCOO^-)/(HCOOH)
    Set up an ICE chart for HCOOH and calculate the (HCOO^-) remembering that the concn of the H^+ to plug into that equation is 0.33M x (21 mL/(21mL + 121 mL) = ??
    Then total H^+ is the sum of H^+ from HNO3 + (COO^-) from HCOOH.
    Post your work if you get stuck.

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