Worlcsheet 410
Chemis*y 12
Chemistry
-pH
and
pOH Calculations
12
Worksheet 4-5
H and oOH Calculations
Name
1. Find the pH of the
correct
following solutions. Make sure you express your answer inthe
pt\ --
\oS f
1
lls6a , pbq-_-\oqiOfF_
"
a) 0.0010 M HClo+ ..... 3. OO b) 2.3s x t0'3 M KoH ... \ \. 3+\
numberofsignificantdigits.(l2marks)
L
c) +.678x
10-5
M
In'lot..q-b2qq
e) 0.20 M Ba(oH)z
.
f oF\a "- 0,+o H
.$1[Q-
d) 12.0 M HCI ......:...........
D 4.30 M
t
HBr.
(tn+, t'.3
a
pH:
o.
Answer
3i2l6r(1 mark)
FtCto rq * tApo
Chemistry I 2 -Wortrs he et
,
a
'!lr$1
=
Answer
o'\5ct4
t
_rl"
xtO t
F4
o, qo Ft
ft\nl=-Ko
=
fatt-\
+ F{sct r cLo+
b&
4
Answer
t
[" \ *tCrf1
(yrrJ
b+ xIor-tt
F4
t,
_f-.,,^r-
[h\uil!
-pH
F4
r+30t1=
-r+
M
\.3t ,.fO
Answer [.. O?
6. Find the [OH-] in 0.150 M HCIO+ (2 marks)
LDF| J =
s?Sb
I
GPr{)
BAO-- Bft&* -t 0 e'
oe- * Huo * noi?$sH
.!-,t.^,
3
(1 mark)
in 0.45 M BaO (2 marks)
6E)
o' !5e
q
(2
4. Find the [H3O*] in a solution with
[HrOl
- O-]
H3o+.................:-0:-bE
+ !tro- + Br
marks)
Li ot\ + L. -t + 0*-L* 3o*] = K*\/Co trr1
t{:-o
!1 Br
3. Find the tH:o*] in 0.80 M LioH.
5. Find the
\
'
2. Find the [H3O*] in 0.00256 M
t#sct=
-
and pA H Calcalations
Page
I of2 Pages
Chenis*y 12
7. Find the [OH'] in a solution with a pH
a
P0\-\
:,\+-
fottl=
8"1\ ntt'M'
Answer
2.156 (1 mark)
(2 marks)
[*3ot]= o.rt b\
=- \(* /r*sof
fortt
pOHL
in solution in which
[H3O*]
and p O H C al cal ati o ns
*{
B.qr{o =- 5.06O
[O]fl in 0.87 M HNO3.
10. Find the
4-pH
: 8.940 (2 marks)
&tution with a pOH:
S.lfina tfre tOFrj in
9. Find the
lrs he e t 4,
Wor
a
Auswer
4.50. (zmarks)
the
\,\ x\o-rd't q
3-\b?-3 xto-s
f-ttfo! i K*/eo$a
Answer
3- )* x
I 1 . Solution A has a pH of 3.0 while soldtion B has a pH of 7.0.
5t
a) Which solution is more acidic?
tlt
b) The tH3O.l in solution
(l mark)
e is \ @0O
jk-
A
ro-to {
S.
,times as high as it is in solution
ev{g pI\ \<.ile \ :
to
B
C- (1
+.^D D,,W
t)
mark). 0 O
x dn,ang< in f !tso+]
12. How much water should be added to 500.0 mL of a solution of HCI with a pH of 2.00 to
^bringthepH
to2.S1.showallyourwork. (3 marks)
pF\ = 9.
5D +*f
(,1!1 = L*J-
HEq:t_: 3
l{r=p.otoo)(5m,o)
\ bLZ x
:
ro-3 H
l.\x\U
aoH
po*Y \\-\ So - ).So )
(**
{t{aoH
Na
=
o
el s2
fo
6-
*1 :
59 \ $,+L
qrU --_@_Gti
ml--t)
13. What mass of NaOH should be added to 300.0 mL of water in order to prepare a
withapH: 11.50. Show all your work. (4 marks)
qN
?
1)
solution \ . o? t *
3. \bzb xto-3 t-{
,
tr^--)
3,\bAl* ro-3
d\
F-
0.036
x A,\IAOE x
Na
o*
\pd \
$ rrot.__
,
g
Chemistry l2-Worksheet
4-$-pH andpOH Calculations
Page 2 of2 Pages
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