Question

Based on my reults Calculate [HIn]equil for each phenolphthalein sample:

Sample:

8.6

8.8

9.0

9.2

9.4

9.6

Unknown

(I know it is initial minus the [In-]equil but i am not sure which value in considered the initial?)

4. Calculate [H,0 ]inir from measured pH for each phenolphthalein. sa Sample 2.0 2 x IO 8.8 9.6 5. Calculate [In lequil from measured Asso using Beer's law for each pl coefficient for phenolphthalein (A 550 nm) 29,300 M cm nn lava Sample 8.8 9.0 9.6 6. Calculate [In from measured A using Beer's law for unkno 550 nm) 29,300 M cm for phenolphthalein (A Sample 73 x IO sample 7. Calculate [HInloqui for each phenolphthalein sample: Sample 8.6 8.8 9.2 9.4 9.6 8. Calculate [HInloquil for unknown sample: Sample

Answer 1

with the assumption that your calculations are correct, I have given the calculation of [HIn]eq for these samples.

with the assumption that your calculations are correct, I have given the calculation of [HIn]eq for these samples. H_in is the protonated from of phenolphinalium in is its conjugate base the solution a.b is so basic that any phenolphithaqlium is the form of HI_n is neglected and can be assumed that it is extremely I_n^- [I_n^-]_eqn = [HI_n]_0 = 1.08 times 10^-5 fpor 0.1 per solution ,we can calculate [HI_n]_eqn by, [HI_n]_eqn = [HIn]_0 - [I_n^-]eqn hope this helps