CH 302 Worksheet 10
1.
NaH
2
PO4 (conc.
= C
NaH2PO4
) is dissolved in water.
Write the mass balance equation for this system.
2.
Write the charge balance equation for the solution in question 1.
3.
Write the charge balance equation for a solution containing all of the following ions: H
+
, OH

, Na
+
, Ba
2+
,
PO
4
3
, Ag
3+
, SO
4
2
, and COOH

.
4.
NaH
2
PO
4
, LiHCO
3
, HCl, NaCl, and LiOH are all dissolved in water.
How many equations are needed
to completely describe this system?
5.
Write a charge balance equation for the system described in question 4.
6.
Write the mass balance equation for H
2
CO
3
(conc. = C
H2CO3
) in water.
7.
Find the pH of 10
8
M HCl like you would have for the last two quizzes.
Then find it using the exact
expression, [H
+
]
2
– [H
+
]C
HCl
– K
w
= 0.
Compare the two answers.
8.
Repeat the same thing as in question 7, this time for 10
2
M HCl.
9.
Assuming an appropriate C
HCl
, derive the approximate equation for a strong acid, [H
+
] = C
a
, from the
expression given in question 6.
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 Spring '10
 Laude
 pH, charge balance equation

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