Answered: A buffer is prepared using lactic acid…

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter4: Reactions In Aqueous Solution

Section: Chapter Questions

Problem 78QAP: When 85.0 mL of 0.250 M Ba(OH)2 solution is added to 85.00 mL of 0.250 M Al (NO3)3 solution, a white...

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1. A buffer is prepared using lactic acid (HLac) and sodium lactate (NaLac). 0.300 dm3 of the
0.500 mol·dm–3 HLac solution is mixed with 0.300 dm3 of the 0.300 mol·dm–3 NaLac solution
to prepare the buffer. Ka for lactic acid (HLac) is 1.4 x 10^-4

What will the pH of the above solution be after 5.0 cm3 of 0.200 mol·dm–3 NaOH has
been added to only 100.0 cm3 of this buffer?

2. Data in the table below were collected at 25°C for the following reaction:
2 I
–
(aq) + S2O8
2–
(aq) I2 (aq) + 2 SO4
2-
(aq)

a) Determine the rate law for the reaction.
b) Calculate the rate constant, giving the correct units for k.

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