What will be the pH
change when 20.0 mL of 0.100 M NaOH is added to 80.0 mL of a buffer
solution consisting of 0.169 M NH3 and
0.188 M NH4Cl? (Assume that there is no
change in total volume when the two solutions mix.)
pKa = 9.25
What is the pH change when 22.4 mL of .07 M NaOH is added to
63.6 mL of a buffer solution consisting of .124 M NH3 and 0.153 M
NH4Cl? (Ka for ammonium ion is 5.6x10^-10.)
What is the pH change when 22.4 mL of .07 M NaOH is added to
63.6 mL of a buffer solution consisting of .124 M NH3 and 0.153 M
NH4Cl? (Ka for ammonium ion is 5.6x10^-10.)
Calculate the expected pH when 0.5 mL of 0.1 M HCL is added to
30.0 mL pure water. Do the same calculation when the same amount of
HCl is added to 30.0 mL of your original .05M buffer. Compare the
calculated pH to the actual measured pH.
My buffer has a pH of 5.09 and I used acetic acid which has a
pKa of 4.76
2.
If you have 50 mL of .05M potassium phosphate buffer pH 7.0 and you...
Calculate the pH change when 10. mL of 3.0 M NaOH is added to
500. mL of the following:
(a) pure water
(b) 0.10 M CH3COO-
(c)0.10 M CH3COOH
(d)a solution that is 0.10 M CH3COO- and 0.10 M CH3COOH
calculate the change in pH when 3.00 ml of 0.1 M HCL
is added to 100 ml of a buffer solution that is 0.1 M in NH3 and
0.1 M in NH4Cl.
Calculate the change in pH when 3.00 ml of 0.1 M NaOH is added to
the original buffer solution.
a.) What volume (to the nearest 0.1 mL) of 4.50-M NaOH must be
added to 0.300 L of 0.150-M HNO2 to prepare a pH = 3.20 buffer?
______ mL
b.) What volume (to the nearest 0.1 mL) of 4.00-M HCl must be
added to 0.700 L of 0.350-M K2HPO4 to prepare
a pH = 7.50 buffer? _______ mL
Calculate the pH change that results when 11 mL of 5.8
M NaOH is added to 776 mL of each the following solutions.
(See the appendix.)
pKa = 9.25
Ka = 5.6e-10
(c) 0.10 M NH3