So we prepared 100mL of .1M solutions of these solutions, and found the pH and H+ contents:

Question

So we prepared 100mL of .1M solutions of these solutions, and found the pH and H+ contents:
                 pH     H+
HCl:            .57    .270
HNO3:           .58   .260
H2SO4:          1.29  .051
HC2H3O2:        2.44 .0036
H2C2O4:        .84    .145
HKC6H4(CO2)2: 4.13    7.41

Now I'm stuck on this question. What conclusions can be drawn from this data? (Hnt: Write a chemical equation expressing the reaction that occurs when the acids are dissolved in water. COnsidering that all the solutions were about .1M what would the expected pH be for each solution? Which solutions attained this value and which didn't? What might be the reason for some solutions not attaining this value?)

Please help!