pka

  1. I

    pKa of an unknown acid

    I titrated 10 mL an unknown weak acid with a strong base (.0755 M) and found the equivalence point to be 12.745 mL of base. To find the molarity of the unknown weak acid solution, I used the equivalence 12.745 to find the moles of NaOH which will equal the moles of acid (which ended up being...
  2. B

    HELP - titration, graphs, pKa, acids >.<

    In my lab I titrated sodium hydroxide to 3 different types of acids. The first acid was hydrochloric acid, 2nd acid (monoprotic) acetic acid, and the 3rd (polyprotic) maleic acid. I'm told to find the pH at the equivalence points(s) and the pKa. How do I find equivalence points on a graph...
  3. C

    Why is pka -log in this problem?

    Starting with 22.85 mL of 0.260 M nitrous acid, HNO2: a. How many milliliters of 0.155 M potassium nitrite, KNO2, would you need to add to produce a buffer with pH 3.60? I have the answer just wanting to know the mechanics. When you do the hensell hasselback equ. pH=-log(pka)+log(nNO2/nHNO2-)...
  4. I

    Calculating pH from pKa

    I am stuck on the following question and would be really grateful if someone could tell me where I am going wrong Calculate the pH of 0.05 M Tranylcypromine Sulphate (pKa=8.20) This is what I have done to calculate it pKa = -log(ka) => ka=6.31x10^-9 Then I had to find the concentration of...