The point of this experiment was to find the concentration of KOH.
1) Label and fill two beakers with KOH and HCl.
2) Pour a little bit of HCl into the burette to rinse it.
3) Fill the burette up to 0 with HCl and make sure there are no air bubbles.
4) Use the pipette to take 10cm3 of KOH and put it into a conical flask.
5) Add 2 drops of indicator into the conical flask filled with KOH.
6) Run the solution from the burette into the conical flask, swirling the flask all the time. .
7) Stop when the KOH turns a lighter pink and note the volume run in from the burette.
8) Empty and rinse the conical flask and dilute it with water.
9) Then re-zero the burette.
10) Then repeat steps 4,5,6, and 7 again to get a 2nd trials results. .
11) Then repeat step 10 three more times.
Results:.
1st Trial 2nd Trial 3rd Trial 4th Trial 5th Trial.
Final Reading 92.9 ml 93 ml 93.1 92.9 ml 93.2 ml.
Initial Reading 0 ml 0 ml 0 ml 0 ml 0 ml.
Volume Added 7.1 ml 7 ml 6.9 ml 7.1 ml 6.8 ml.
Analysis:.
HCl = .75 M.
KOH = 10cm-3.
KOH + HCl KCl + H2O.
1 : 1.
Average = 7.1 + 7 + 6.9 + 7.1 + 6.8 = 34.9/5 = 6.98.
M = N/V.
75 = N (6.98/1000).
(6.98/1000) .75 = N.
N = .005mols.
M = N/V.
M = .005 (10/1000).
M = .54 M .
KOH + HCl KCl + H2O.
Conclusion:.
After doing this experiment I got .54 M as the concentration for KOH. This means that you need around .54 molars of KOH as well as around 6.98 ml of HCl for this experiment to succeed. One knows when the experiment has worked because the KOH with the indicator in the conical flask will turn clear from its original color purple. Throughout the experiment there could have been some sources of error. One source of error could have been that we added a little to much HCl to the KOH with the indicator in it. This could have been a problem because the solution may have gone neutral before and could have made our volume added wrong. Another source of error could have been that the equipment wasnt as clean as it could have been making our results slightly wrong.
