Question

you have weighed out 0.755g of an unknown monoprotic weak acid and titrated it with 0.497 M NaOH. You have monitored the progress of the reaction with a pH meter and obtained the following data.

mL pH mL pH 0 3.97 13 7.73 1 4.13 14 8.49 2 4.13 15 9.31 3 4.39 16 9.71 4 4.54 17 9.95 5 4.70 18 10.24 6 4.88 19 10.45 7 5.07 20 10.64 8 5.31 21 10.80 9 5.58 22 10.95 10 5.99 23 11.08 11 6.54 24 11.19 12 7.06 25 11.24
Using excel, construct a titration curve for the above data and print it out. Determine the equivalence point of the titration. Determine the molar mass of the unknown acid. Show calculations. Calculate the Ka value for the unknown acid. Show calculations.

Answer 1