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1) Many household cleaning products contain oxalic acid H2C2O4, , a diprotic acid with the following dissociation constants: Ka1=5.9E-2 and Ka2=6.4E-5 Calculate the equilibrium concentration of C2O4^2- in a 0.20 M solution of oxalic acid. 2) A cetain weak acid, HA, has a Ka value of 1.4E-7 A) Calculate the percent ionization of HA in a 0.10 M solution. B) Calculate the percent ionization of HA in a 0.010 M solution. 3) A particular sample of vinegar has a PH of 3.20: If acetic acid is the only acid that vinegar contains (Ka=1.8E-5) , calculate the concentration of acetic acid (HC2H3O2) in the vinegar.

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