COLLEGE BRONX COMMUNITY May 26, 2017 Thomas Brennan nr. 5. Given the following c

Question

COLLEGE BRONX COMMUNITY May 26, 2017 Thomas Brennan nr. 5. Given the following choices, determine which description best describes the solution resulting from the mixing of 10 ml of each of the solutions below. A) strongly acid B strongly basic Co acid buffer D) basic buffer E) pl of NaHCO3 acid due F) neutral no hydrolysis G) basic due to hydrolysis b) 0.1 M HAc 0,1 M NaOH a) 0.1 M HAe 0.05 M NaoH c) 0.05 M HAc t 0.1 M NaOH e) 0.1 M H2CO3 +0.1 M NaoH d) 0.1 M H2CO3 0.05 M NaoH g) 0.1 M H2co3 0.2 M NaoH 0.1 M H2Co3 0,15 M NaOH h) 0.1 M H2CO3 0.25 M NaoH HAc Ht Ac- Ka 1.8 x 10 5 pka 4.74 6.34 K1 4.7 x 107 pK1 pK2 10.36 H2003 K2- 4,4 x 10-11 Hco3- H+ co3-2 Note: In order to help answer the above questions sketch the two titration curves (pH vs. [NaoHD Curve 1 for a), b), and c) for HAc NaoH, and Curve 2 d), e), f, g), and h) for H2co3 NaoH. for Curve 1: Curve 2:

Explanation / Answer

Q5

a)

0.10 M of HAC + 0.05 M of NaOH = produces a buffer, which is acidic, choose C

b)

0.10 HAc + 0.1 of NaOH = neutralization, then there will be hydrolysis, which increases pH; choose G

c)

there is excess base, so this will be strongly basic

d)

this will be a buffer formation, since HCO3- and H2CO3 are present, this is acidic buffer

e)

this is neutrailzation of the first, point, pH = 1/2*(pKa + pKa2) = this is basic due to hydrolysis; i.e. pH of NaHCO3

f)

this is a buiffer, it is the second point, so tehre will be a bassic buffer

g)

this is total neutralization so expect a very acid due to hdyrolyos

h)

this is excess of base, so choose strongly basic

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