Question

Calculate the final concentrations of the following aqueous solutions after each has been diltuted to a final volume of 25.0 mL:

a) 1.00 mL of .463 M Na+

b) 2.00 mL of 3.45 mM LiCl (in mM)

c) 5.00 mL of .0645 mM Zn2+ (in mM)

Answer #1

a) 1.00 mL of .463 M Na+

Millimoles of Na+ = 0.463 x 1 = 0.463 mmol

Final Volume = 25 mL

=> **Molarity = 0.463 / 25 = 0.01852 M or 18.52
mM**

b) 2.00 mL of 3.45 mM LiCl (in mM)

Millimoles of LiCl = 3.45 x 0.02 = 0.069 mmol

Final Volume = 25 mL

=> **Molarity = 0.069 / 25 = 2.76 x 10^-3 M = 2.76
mM**

c) 5.00 mL of .0645 mM Zn2+ (in mM)

Millimoles of Zn2+ = 0.0645 x 0.05 = 3.225 x 10^-3 mmol

Final Volume = 25 mL

=> **Molarity = 3.225 x 10^-3 / 25 =1.29 x 10^-4 M =
0.129 mM**

Calculate the final concentrations of the following aqueous
solutions after each has been diluted to a final volume of 25.0
mL:
1-1.00 mL of 0.458 M Na+
2-2.00 mL of 3.48 mM LiCl
3-5.00 mL of 5.55 mM Zn2

For each of the following solutions, calculate the initial pH
and the final pH after adding 0.010 mol of NaOH.
c) For 220.0 mL of a buffer solution that is 0.285 M in
CH3CH2NH2 and 0.255 M in CH3CH2NH3Cl, calculate the
initial pH and the final pH after adding 0.010 mol of NaOH.

For each of the following solutions, calculate the initial pH
and the final pH after adding 0.005 mol of NaOH.
For 260.0 mL of a buffer solution that is 0.265 M in
CH3CH2NH2 and 0.235 M in CH3CH2NH3Cl, calculate the
initial pH and the final pH after adding 0.005 mol of NaOH.

For each of the following solutions, calculate the initial pH
and the final pH after adding 0.010 mol of NaOH .
Part B
250.0 mL of a buffer solution that is 0.200 M in HCHO2 and 0.305
M in KCHO2
Part C
250.0 mL of a buffer solution that is 0.265 M in CH3CH2NH2 and
0.245 M in CH3CH2NH3Cl
Express your answers using two decimal places separated by a
comma.

For each of the following solutions, calculate the initial pH
and the final pH after adding 0.0150 mol of NaOH.
For 270.0 mL of pure water, calculate the initial pH and the
final pH after adding 0.0150 mol of NaOH.
For 270.0 mL of a buffer solution that is 0.240 M in
HCHO2 and 0.310 M in KCHO2, calculate the initial pH and
the final pH after adding 0.0150 mol of NaOH(Ka=1.8⋅10−4).
For 270.0 mL of a buffer solution that...

For each of the following solutions, calculate the initial pH
and the final pH after adding 0.010 mol of NaOH.
Part A: For 270.0 mL of a buffer solution that is 0.205 M in
HCHO2 and 0.305 M in KCHO2, calculate the initial pH and the final
pH after adding 0.010 mol of NaOH. Express your answers using two
decimal places separated by a comma.
Part B: For 270.0 mL of a buffer solution that is 0.285 M in
CH3CH2NH2...

For each of the following solutions, calculate the initial pH
and the final pH after adding 0.0100 mol of NaOH.
Part A
For 300.0 mL of pure water, calculate the initial pH and the
final pH after adding 0.0100 mol of NaOH.
Express your answers using two decimal places separated by a
comma.
Part B
For 300.0 mL of a buffer solution that is 0.210 M in
HCHO2 and 0.280 M in KCHO2, calculate the initial pH and
the final...

For each of the following solutions, calculate the initial pHand
the final pH after adding 0.005 mol of NaOH.
260.0 mL of a buffer solution that is 0.225 M in HCHO2 and 0.315
M in KCHO
260.0 mL of pure water
260.0 mL of a buffer solution that is 0.275 M in CH3CH2NH2 and
0.245 M in CH3CH2NH3Cl

For each of the following solutions, calculate the
initial pH and the final pH after adding 0.0200 mol of
NaOH.
Part A
For 290.0 mL of pure water, calculate the initial pH and the
final pH after adding 0.0200 mol of NaOH.
Express your answers using two decimal places separated by a
comma.
Answer: pHinitial, pHfinal = 7.00,12.84
Part B
For 290.0 mL of a buffer solution that is 0.200 M in
HCHO2 and 0.310 M in KCHO2, calculate the...

The acetic acid and sodium acetate solutions will have
concentrations of 0.50 M.
1. Calculate Concentrations of acetic acid and sodium acetate in
the prepared buffer solutions in Part I as noted in the following
table:
Solution
Voluem of Acetic Acid (mL)
Volume of Sodium Acetate (mL)
A
25
25
B
45
5
C
5
45
W
0
0
2. Calculate Theoretical pH of prepared buffer solutions

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