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Skills Worksheet
Math Skills
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Determining pH
After you study each sample problem and solution, work out the practice problems on
a separate sheet of paper. Write your answers in the spaces provided.
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PROBLEM
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What is the ptl of 4 0.001 M solution of the strong acid HI dissolved in water?
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SOLUTION
Step
1:
List the given and unknown values.
Given:
r*
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,t
str
M
Unknown: pH
.qi
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'It
concentration of HI in solution: 0.001
Step
2:
illlr
Determine the molar concentration of hydroxide ions.
concentration of HI in solution: 0.001 M
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HI is a strong acid,
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so the concentration
of hydroxide ions in the solution
is equal to the concentration of HI
concentration of H3O* ions
Step
3:
: concentration HI: 0.001 M:
1
x i0-3 M
Convert the H:O* concentration to pH
pH: the negative of the power of ten used to describe the concentration
of H3O* ions
concentration of H3O* ions =
pH: -(-3) :
1
x
10-3
M
3
PRACTICE
1.
A sfrong acid, HBr, has been dissolved into a beaker of water. If the solution is
known to be 0.000 001 M, what is the pH of the solution?
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2. Tetrafluoroboric acid, IIBFa, is dissolved into a 1 x 10-2 M solution. Since
tetrafluoroboric acid is a strong acid, what is the pH of the solution?
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3. What is the pH of a 0.001 M solution of HI, a strong acid, dissolved in
solution?
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Origioal content C.opyright O by Holt, Rinebart md Winston. Additions and chaages to the origilal @nteDt tre tle responsibility of rhe instuctor
Holt Science Spectrum
15
Acids, Bases, and Salts
Name
Math Skills continued
4. What is the pH of a 0.000
001 M solution of HCl, a strong
acid?
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Periodic acid, HIOa, rs,a strong
acid. If periodic acid is dissolved
in a
1 x 10-5 M solution, what
is the pH of the solution?
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6.AgivensolutionhasFINo3,nikicacid,di,,otu.dffi
0.001 M solution, what
i, i;; pHt
7. What is rhe pHof a 0'000
5
t
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fi'#;:::iiti$".roa,
--
0i M solution of the strong u"id, hydrobromic
u"iat
is dissolved in a
Ix
r0_2
N4m
PROBLEM
:
It:
A solution with a pH of 4 consists
of the strong acid surfuric acid,
or Hzsoq,
dissolved in water. What is the
moia"ity of the solution?
Step 1: List the given and
unknown values
Given: pH of solution:4
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Step
2:
s:
Unknown: molarity
Convert the pH to II3O* concentration.
'pH: the negative of the power of ten used to d.."rib" the concentration
of hydronium ions
concenkation of
H3O*: 1 I
16-0rD 14
H3O*: I x
10-4
PH:4
concenhation of
step
3:
M
convert the H3o* concentration to
acid concentration.
HzSO+ is a shong acid, H3o*
concentration: H2So4 concentation
i,t
flsU concentration=
1x l0{M
HzSO+ concenhation: 1 x
10+ M:0.0001 M
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original content copyrieht
@
bv Hdq Rinehart and
winslo''
Additjons and changes to the
originar content are the responsibility
ofthe instructor.
v
Name
Math Skills continued
PRACTICE
9. Chloric acid, HC1O3, is a sfrong acid. What is the concentration of a chloric
acid solution with apH of 2?
L+l.l --lo ?H = \D-'
10. What is the concentration
of a hydrochloric aci
solution with a pH
of
5? Hydrochloric acid is a strong acid.
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1
1.
A solution is composed of the strong acid nitric acid, HNO3, dissolved in
water. If the solution has a pH of 3, what is the concentration of the solution?
O.
12.
\\
A permanganic acid (HMnOa) solution
t[ permanganic
Gtven that
of 5. Given
has a pH ot
acid is a strong acid, what is the concentration of the solution?
O.c:CO O\ M
13.
Hydrobromic acid is a strong acid. A hydrobromic acid solution has a pH of
What is the concentration of hydrobromic acid in the solution?
14. What is the concentration
strong acid.
of an HBF4 solution that has
a
3.
pH of 6? HBFa is a
o. coooo\ M
15. HIO4, or periodic acid, is a sfrong acid. What is the concentration
acid in a solution whose PH is
of periodic
1?
MIXED PRACTICE
16. What is the
pH of a
Ix
10+ solution that contains dissolved HC1O3, a strong
acid?
17.
What is the concentration of a solution with
acid HI, or hydroiodic acid?
18. What is the
a
pH of 3, if it contains the strong
pH of a 0.01 M permanganic acid solution? Permanganic acid is a
strong acid.
of the instructor'
Original contat Copyright O by Holt, Rinehart and Winston. Additions and chonges to the orighal mtent 3re the responsibility
Holt Science Spectrum
17
Acids, Bases, and Salts
Math Skills continued
19.
sulfuric acid is a strong acid. A sulfuric acid solution has a pH of 6.
the concenhation of the solution?
,O3
3? Hydrochloric acid is a strong acid.
21. Calculate the pH of a
Ix
10-5 solution
of HCIO3, a strong acid.
,;\
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original contcot copyright
@
by Holt, Rinehart aod winsion. Additions and changes to the original
conteot are &e tcsponsibility ofthe inskuctor.
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