12.0 1 10.0 pH of solution in flask 8.0 Equivalence Point 6.0 4.0 2.0 5 10 15 20 25 30 35 40 45 mL of 0.115 M NAOH added to flask A 50.0 mL sample of a solution of an unknown compound is titrated with a 0.115 M NaOH solution. The titration curve above was obtained. a). What would be the molar mass of the unknown acid if the density of the solution is 1.00g/mL and mass concentration of the acid is 3.00 g/L. Molar Mass = g/mole Please use 3 sig figs for the ans, just provide the value no need for units). (Note: use the plot to estimate the volume needed to reach the equivalence point) ɔ). What would be the pKa of the unknown acid? pka = (please use two sig igs for the ans) (use the plot above to estimate) c). What would be the concentration of the HA and conjugate A- when 9.00 mL of 0.115 M NaOH is used for the titration. (please use 3 sig figs for the ans and just imput the units) (Hint: use the mmoles of HA estimated from part a) O OO O

12.0 1 10.0 pH of solution in flask 8.0 Equivalence Point 6.0 4.0 2.0 5 10 15 20 25 30 35 40 45 mL of 0.115 M NAOH added to flask A 50.0 mL sample of a solution of an unknown compound is titrated with a 0.115 M NaOH solution. The titration curve above was obtained. a). What would be the molar mass of the unknown acid if the density of the solution is 1.00g/mL and mass concentration of the acid is 3.00 g/L. Molar Mass = g/mole Please use 3 sig figs for the ans, just provide the value no need for units). (Note: use the plot to estimate the volume needed to reach the equivalence point) ɔ). What would be the pKa of the unknown acid? pka = (please use two sig igs for the ans) (use the plot above to estimate) c). What would be the concentration of the HA and conjugate A- when 9.00 mL of 0.115 M NaOH is used for the titration. (please use 3 sig figs for the ans and just imput the units) (Hint: use the mmoles of HA estimated from part a) O OO O

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter15: Additional Aqueous Equilibria

Section: Chapter Questions

Problem 110QRT: Consider the nanoscale-level representations for Question 110 of the titration of the aqueous weak...

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Consider the nanoscale-level representations for Question 110 of the titration of the aqueous weak acid HX with aqueous NaOH, the titrant. Water molecules and Na+ ions are omitted for clarity. Which diagram corresponds to the situation: After a very small volume of titrant has been added to the initial HX solution? When enough titrant has been added to take the solution just past the equivalence point? Halfway to the equivalence point? At the equivalence point? Nanoscale representations for Question 110.
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