Determine the pH change when 0.089 mol KOH is added to 1.00 L of
a buffer solution that is 0.343 M in HCN and 0.386 M in CN-. pH
after addition − pH before addition = pH change =
Determine the pH change when
0.093 mol HCl is added to
1.00 L of a buffer solution that is
0.497 M in HNO2 and
0.311 M in
NO2-.
pH after addition − pH before addition = pH change
= ___________________
Determine the pH change when
0.115 mol KOH is added to
1.00 L of a buffer solution that is
0.457 M in HNO2 and
0.256 M in
NO2-.
pH after addition − pH before addition = pH change
=_____________
Calculate the change in pH when 0.334 mol H+ is added to 1.00 L
of each of the following buffers.
a 0.580 M solution of pyridine (py) containing 0.500
M pyH+
a 0.580 M solution of aniline (an) containing 0.900
M anH+
Calculate the change in ph when 0.24 mol H+ is added to 1.00 L
of each of the following buffers:
a) a 0.58 M solution of pyridine (py) containing 0.52 M pyH+
b) a 0.60 M solution of aniline (an) containing 0.88 M anH+
Calculate the change in pH when 0.28 mol H+ is added to 1.00 L
of each of the following buffers:
(a) A 0.58 M solution of pyridine (py) containing 0.52 M
pyH+
(b) A 0.60 M solution of aniline (an) containing 0.92 M anH+
Calculate the
change in pH when 0.32 mol H+
is added to
1.00 L of each of the following buffer
(a) a 0.56 M
solution of pyridine (py) containing 0.50 MpyH+
Number....
(b) a 0.58 M
solution of aniline (an) containing 0.88 M anH+
Number......
What is the change in pH when 10.0 mL of 0.250 M KOH
(aq) is added to 100.0 mL of a buffer that is 0.150 M in
HCOOH (aq) and 0.100 M in HCOO– (aq)?
pKa = 3.75 for HCOOH (aq).
Select one:
a. –0.26 pH unit
b. +0.18 pH unit
c. +0.00 pH unit
d. –0.81 pH unit
QUESTION 2
What is the molarity of an aqueous barium hydroxide solution if
it takes 59.9 mL of 0.100 M HCl...
What is the pH of a 1.00 L buffer solution that is 0.80 mol
L-1 NH3 and 1.00 mol L-1
NH4Cl after the addition of 0.070 mol of NaOH(s)?
Kb(NH3) = 1.76 ? 10?5
Calculate the change in pH that occurs when 0.00100 mol of
gaseous HCl is added to a buffer solution that is prepared by
dissolving:
A) 4.92g of sodium acetate (molar mass = 82.03g/mol) in 250 mL
of 0.150 mol/L of acetic acid solution?
B) 0.492g of sodium acetate (molar mass = 82.03g/mol) in 250 mL
of 0.0150 mol/L of acetic acid solution?
Assume no change in volume upon addition of either the sodium
acetate or HCl. (Ka for acetic acid...
calculate the change in pH that occurs when 0.00100 mol of
gaseous HCL is added to a buffer solution that is prepared by
dissolving 4.92 g of sodium acetate in 250 ml of 0.150 mol L^-1 of
acetic acid solution? Assume no change in volume upon addition of
either sodium acetate of HCL (Ka=1.8x10^-5)