Titration Curve Question

Question

Hi!

I have done a titration lab and drew a chart to represent the values I got. However, my chart turned out to be something strange. I will try to paste the picture in a comment below, since it won't let me do so in the description box.

I wonder why there is like a little "bump" or "pause" near pH= 6. Shouldnt it be only a steep curve there? What did I do wrong in the lab that could give me something like that?

If relevant to know, I measured pH after every added cubic centimeter of NaOH up to 25.

Thanks in advance for help!

Answer 1

Well, this certainly is a dilemma. Not knowing anything about the titration, it's difficult to even "guess" at what is amiss. Did you titrate a strong acid with a strong base (or vice versa). Or was a weak acid or weak base involved. This makes a difference in the anticipated pH at equivalence. Also, if an acid it titrated, is it a monoprotic acid? Are the reagents all pure? An impurity could cause a fluctuation in the ideal titration curve. There could be other variables also, but I'd need more information.