What Can pH Titration Tell Us?
To determine the molecular weight of unknown acid “D” by adding 0.1 M drops
HCL acid at a time and recording observations of the reaction and the final pH.
By following the procedure, one should be able to determine the pH of the
solution by using a pH probe, that will then all you to create a plot graph. On the plot
graph you should be able to determine the equivalence point. With the equivalence point
found, the pH and the unknown molecular weight of the acid should be obtainable
through the appropriate calculations.
A buffer is basically a solution made up of an acid and its conjugate base
that try to keep the pH of the solution at a fairly constant. The way a buffer works, is by
reacting with either the acid or base. However, the buffer will react differently depending
on the strength, or lack there of, of the acid or base. When mixed with a strong base and a
strong acid, the pH will remain about 7. If it is mixed with a weak acid and a strong base,
the pH will rise above 7 becoming more acidic. Finally, if it is a combination of a strong
acid and a weak base the pH will drop below 7 becoming more of a base. Buffers are not
just something found in chemistry labs; no instead they have a very significant purpose in
the field of medicine. One good example of this would be the pH of urine. If the pH
increases too much the urine will be come very acidic and a person will have a lot of pain
when trying to urinate. A buffer can help maintain or re-obtain
a pleasant pH in the
Ph probe, HCL, NaOH, 100mL volumetric flask, volumetric pipets, buret,
magnet stir bar, and a stir plate.
Before starting the experiment you need to first gather all your materials
which include: Ph probe, HCL, NaOH, 100mL volumetric flask, volumetric pipets, buret,
magnet stir bar, and a stir plate. Now that all that all the materials are gathered take your
pH probe and calibrate it. To do this check to make sure that the pH probe is connected to
the amplifier box, if it is not then take the BNC connector of the electrode cable and plug
it into the mating connector on the pH Amplifier box and then turn the BNC connector to