B-L Acids and Bases
What is the conjugate base of HNO2?
K > 1 means equilibrium is shifted
to the right
The larger the Ka, the _____ the acid
stronger
An acid donates this
a proton
Buffered solutions contain a mixture of...
A weak acid and its conjugate base OR
a weak base and its conjugate acid
What is the conjugate acid of HSO4-?
H2SO4
How can you change the value of Keq?
Change temperature
How are Ka and Kb related?
Ka * Kb = Kw
Name the acid: HNO3
Nitric acid
What does a buffer do?
resists change in pH
What is the conjugate base of H2O?
OH-
HA + B- <----> A- + HB
If K < 1, what base is weaker?
B-
Kw can vary depending on this
temperature
Name the acid: HClO4
Perchloric acid
Suggest a salt that could be combined with acetic acid, CH3COOH(aq) to form a buffer.
Answers may vary
(ie. sodium acetate)
When NaClO is added to water, which ion is basic? which ion acts as a spectator?
Na+ spectator
ClO- base
HA + B- <----> A- + HB
If K > 1, what acid is stronger?
HA
What is Kw equal to at 25 degrees C?
1 X 10-14
Who is the QB for the San Francisco 49ers?
Calculate the pH of a mixture containing 0.100 M HC3H5O2 and 0.100M NaC3H5O2.
pH = 4.89
What is the conjugate acid of ammonia, NH3?
NH4+
HA + B- <----> A- + HB
How would increasing the concentration of B- shift equilibrium?
Shift to the right to drive off excess concentration
What is Ka equal to when Kb = 1.0 X 10-5?
1.0 X 10-9
What is the date of your AP Chem test?
May 7
The Ka for four acids are: H2SO3 1.4x10-2, H2S 8.9x10-8, HF 6.3x10-4, C6H8O6 9.1x10-5.
The pH's of 0.75 mol/L of each solution of these acids were measured. List the acids in order from the highest pH to the lowest pH.
H2S
C6H8O6
HF
H2SO3