Question

Titration Lab Procedure: Name Part 1 : Take the titration lab data and graph each data set for Ph vs. Vol NaOH. The biggest changes in ph vs. vol NaOH indicate endpoints. Use your notes to write down the net ionic equations and ph indicators for each titration. Report the three graphs for HCl + NaOH, H,PO, and NaOH, and CHCOOH and NaOH. Part 2 Pka Estimation. Once you have found each endpoint, find the volume that it corresponds to. Go to half that volume and go find the ph. This ph is the pka. For diprotic acids, find the endpoint as before, and go to the halfway point between the first endpoint and that one. Use the pka data given to find the percent error in each pka. Do not find the Pka for the HCl and NaOH data. Part 3: Draw the Setup given and give the ph indicators used in each titration. Be sure to give a conclusion from your lab data on the graphs and pka's. You may want to discuss acid strength vs. ending ph.

pls answer part 1,2,3 pls need help

Answer 1

The data of the degrees are graphed:

HCI V NaOH PH 11,5 2,3 4,22 4,4 5,1 5,7 5,81 6 21,2 22 25 26 27,5 28,2 8,5 11,9 12,2 12,4 12,5 12,7 12,8 13 0 5 10 15 20 25 30 35 40 45 50 47

Malonic Acid V NaOH Грн 0 1,8 2,3 2,6 2,7 2,75 2,8 GE 3 4,2 5 165 5,85 6,6 100 150 200 250

There are the equivalence points in each case:

HCl: Veq = 27 mL

CH3COOH: Veq1 = 90 mL

Veq2 = 160 mL

H3PO3: Veq1 = 50 mL

Veq2 = 100 mL

We have the equivalence midpoints and pKa:

HCl: Veq / 2 = 13.5 mL

pKa = 4.6

CH3COOH: Veq1 / 2 = 45 mL

pKa1 = 2.8

Veq2 / 2 = 125 mL

pKa2 = 4.5

H3PO3: Veq1 / 2 = 25 mL

pKa1 = 2

Veq2 / 2 = 75 mL

pKa2 = 6.2

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