acid base ch 16 comprehensive

7/26/2019 Acid Base Ch 16 Comprehensive

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Acid, Base, Equilibrium (Chapter 16) Worksheet

Calculating Ka or Kb gien Concentrations

1.Given that the Kavalue for acetic acid is 1.8 x 10-5and the Kavalue for hypochlorous acid is 3.5 x 10

-8,

which is the stronger ase, !"l-or "#$3!#-% &level 1'

!"l-

#. (dentify the )ewis acid and the )ewis ase in each of the following reactions. &level 1'

a. *&!$'3&aq'+ $#!&l'*&!$'-&a'+ $

+&a'

. g+&a'+ #/$3&a'g&/$3'#+

&a'

c. *3&g'+ -&a'*

-&a'

a. *&!$'3, acid $#0, ase

. g+, acid /$3, ase

c. *3, acid -, ase

3. 2ould you expect e3+or e#+to e the stronger )ewis acid% xplain.

e3+

ecause it is s4aller with a greater positive charge, e3+

will e 4ore strongly attracted to a lone pairof electrons fro4 a )ewis ase

. 10.0-4) sa4ple of an $"l solution has a p$ of #.000. 2hat volu4e of water 4ust e added to

change the p$ to .000% &level #'

0 4) $#!

5. )actic acid &$"3$503', which is present in sour 4il6, also gives sauer6raut its tartness. (t is a

4onoprotic acid. (n a 0.100 7 solution of lactic acid, the p$ is #. at #5 ". "alculate the Ka and pKa for

lactic acid at this te4perature. &level 1'

Ka 1. x 109-, p6a 3.85

:. 7ethyla4ine, "$3/$#is a wea6 ase and one of several sustances that give herring rine its pungentodor. (n 0.100 7 "$3/$#, only :.; of the ase has undergone ioni


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&c' KaK

w

Ka

=1.0 10

14

1.58 1010

:.3310-5

!iprotic"#ol$portic Acid !issociation

8. Ehe overall dissociation of oxalic acid, $#"#!, is represented elow. Ehe overall dissociation constantis also indicatedA

$#"#!&a' B # $+&a' + "#!

#-&a' Keq 3.=8 x 10-:

a. Give the net ionic euations representing the first and second dissociations of oxalic acid.

"alculate the value of the first dissociation constant, Ka1, for oxalic acid if the value of the second

dissociation constant of oxalic acid, Ka2, is :.0 x 10-5.

. irst acid dissociation euation

>econd acid dissociation euationA

"alculation of Ka1A

c. Eo a 0.015-4olar solution of oxalic acid, a strong acid is added until the p$ is 0.5 &at

euiliriu4'. "alculate the ?"#!#-@ in the resulting solution. ssu4e the change in volu4e when

the strong acid is added is negligile.

d. "alculate the value of the euiliriu4 constant, Kb, for the reaction that occurs after solid

/a#"#!has dissolved in water. ssu4e only one hydrolysis reaction occurs.

&a' 5.00F10D3 4ol oxalic acid 2 mol H

+

1 mol oxalic acid

1 mol OH

1 mol H+

1000. mL NaOH

0.400 mol NaOH #5.0 4)

/a!$

&' $#"#!B $++ $"#!

D

$"#!DB $++ "#!

#D

K K1K2

K1K

K2

3.78 10

6

6.40 105

5.1F10D#

&c' X a4t. ioni


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10. typical vita4in " talet &containing pure ascoric acid, $#":$:!:' weighs 500. 4g. !ne vita4in "

talet is dissolved in enough water to 4a6e #00.0 4) of solution. "alculate the p$ of this solution.

scoric acid is a diprotic acid.

3.00

Calculating p%"concentration gien Ka or Kb

11. student planned an experi4ent that would use 0.10 7 propionic acid, $"3$5!#. "alculate the

values of ?$+@ and p$ for this solution. or propionic acid, Ka 1. x 109-5 &level #'

nsA ?$+@ 1.# x 109-3 7, p$ #.#

1#. "alculate the p$ of a #.07 $#>!solution.

D0.30

13. solution of hydra


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1=. 2ill an aueous solution that is 0.#0 7 /$ e acidic, asic, or neutral% &level 1'

cidic

18. l&/!3'3 K#"!3 /a$>! /$"l

&a' redict whether a 0.10 4olar solution of each of the salts aove is acidic, neutral or asic. &level 1'

(b) or each of the solutions that is not neutral, write a alanced che4ical euation for a reaction

occurring with water that supports your prediction. &level #'

&a' l&/!3'3D acidic K #"!3D asic

/a$>!D acidic /$"l D acidic

&' l3++ $#! l&!$'#++ $+

l&$#!':3++ $#! ?l&$#!'5!$@

#++ $3!+

l3++ 3 $#! l&!$'3+ 3 $+

"!3#D+ $#! $"!3

D+ !$D

$>!D+ $#! >!

#D+ $3!+

/$++ $#! /$3+ $3!

+

1. 2hat is the p$ of a 0.10 7 solution of /a!"l% or $!"l, Ka 3.0x109-8 &level #'p$ 10.#:

#0. 2hat is the p$ of a 0.#0 7 solution of hydra

acid base ch 16 comprehensive

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