Unknown Acid Lab!

Unknown Acid Lab

Last week, we worked on another titration lab that is pretty much identical to the previous titration lab (Acetic Acid lab). The only thing that's changed is that we're not using acetic acid, rather an unknown acid. We still titrated the unknown acid with NaOH, just like the acetic acid lab. Another thing that's been added to this lab is that we have to heat the solution as the unknown acid does not dissolve as easily as acetic acid. It's pretty neat seeing the solution turn into a mini tornado when the magnetic thingamajig is added to the flask and spins due to the magnet in the heater.
One frustrating thing about this lab is that we can't seem to get a good percent error like last lab where we got less than 1% error! The first trial of this lab gave us a 14% error, which is definitely not preferred, and the second trial gave us a 7% error, however when we re-did the experiment the following day, we were able to get a less than 1% error like the first lab.

Solution being stirred