Question

A) For 480.0 mL of pure water, calculate the initial pH and the final pH after adding 0.010 mol of HCl. Express your answers using two decimal places separated by a comma.

B) For 480.0 mL of a buffer solution that is 0.150 *M* in
HC2H3O2 and 0.135 *M* in NaC2H3O2, calculate the initial pH
and the final pH after adding 0.010 mol of HCl.

Express your answers using two decimal places separated by a comma.

C) For 480.0 mL of a buffer solution that is 0.185 *M* in
CH3CH2NH2 and 0.170 *M* in CH3CH2NH3Cl, calculate the
initial pH and the final pH after adding 0.010 mol of HCl.

Express your answers using two decimal places separated by a comma.

Answer #1

**A) pH of pure water is 7, meaning the [H+] = [OH-], by
adding 0.01 moles of HCl to the 0.48L water, you create a 0.01moles
/ 0.48L = 0.021M solution of HCl, which gives you a [H+] of
0.021M
pH = -log[H+] = -log[0.021M] = 1.67**

**C)**

**Kb of ethylammine = 4.3 x 10^-4
pKb = 3.37
pOH = 3.37 + log 0.17 / 0.185 = 3.33
pH = 14 - 3.33 =10.67 ( initial pH)
moles CH3CH2NH3+ = 0.17 x 0.480 L=0.0816
moles CH3CH2NH2 = 0.185 x 0.480 L=0.0888
CH3CH2NH2 + H+ = CH3CH2NH3+
moles CH3CH2NH3+ = 0.0816 + 0.010 =0.0916
moles CH3CH2NH2 = 0.0888 - 0.010 =0.0788
concentration CH3CH2NH3+ = 0.0916 / 0.480 =0.191 M
concentration CH3CH2NH2 = 0.0788 / 0.480=0.164 M
pOH = 3.37 + log 0.191 / 0.164=3.43
pH = 10.57**

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 0.010 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 0.0100 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 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...

Exercise 16.50
For each of the following solutions, calculate the initial pH
and the final pH after adding 0.0200 mol of NaOH.
Part A
For 300.0 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.
pHinitial, pHfinal =
7.00,12.82
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Correct
Part B
For 300.0 mL of a buffer solution that is 0.210 M in
HCHO2 and 0.310...

For 460.0 mL of a buffer solution that is 0.150 M in CH3CH2NH2
and 0.135 M in CH3CH2NH3Cl. Calculate the inital pH and the final
pH after adding 0.020 mol of HCl.
Express your answer using two decimal places separated by a
comma.

Part A For 550.0 mL of pure water, calculate the initial pH and
the final pH after adding 0.010 mol of HCl .
Part B For 550.0 mL of a buffer solution that is 0.155 M in HC 2
H 3 O 2 and 0.140 M in NaC 2 H 3 O 2 , calculate the initial pH and
the final pH after adding 0.010 mol of HCl .
Part C For 550.0 mL of a buffer solution that is...

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 solution, calculate the initial pH and the final pH
after adding 0.020 mol of HCl.
B.) 520.0 mL of a buffer solution that is 0.120 M in HC2H3O2 and
0.100 M in NaC2H3O2
pHinitial =
pHfinal =
C.) 520.0 mL of a buffer solution that is 0.150 M in CH3CH2NH2
and 0.130 M in CH3CH2NH3Cl
pHinitial =
pHfinal =

For each of the following solutions, calculate the initial pH
and the final pH after adding 0.010 mol of NaOH.
For 300.0mL of pure water, calculate the initial pH and the
final pH after adding 0.010 mol of NaOH.
For 300.0mL of a buffer solution that is 0.240M in
HCHO2 and 0.280M in KCHO2, calculate the initial pH and
the final pHafter adding 0.010 mol of NaOH.
For 300.0mL of a buffer solution that is 0.305M in
CH3CH2NH2 and 0.285M...

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