Titration
Buffers Calculations
Buffers
Solubility
100
The point in a titration at which the number of mole of the acid = the number of mole of the base
equivalence point
100
pH=pKa + log([base]/[acid])
What is the Henderson–Hasselbalch equation?
100
A solution that resists the change in pH upon adding a small amount of strong acid or strong base
Buffer
100
The solubility product expression for tin(II) hydroxide, Sn(OH)2, is
[Sn2+][OH-]2
200
What type of titration results in a pH < 7 at equivalence point?
weak base - strong acid titration
200
What is the net ionic equation for NH4+ and NaOH?
OH- + NH4+ --> NH3 + H2O ?
200
This is what a buffer is made of.
weak acid/base and its conjugate
200
A common ion will decrease the molar solubility.
True or False
True
300
What type of acid is used in this titration?
diprotic acid
300
This is the pH of 50.00 mL buffer solution which is 2.00M in HCl2H3O2 and 2M in NaC2H3O2. Ka of acetic acid=1.8x10-5.
What is What is 4.74?
pH = -log(1.85×10-5) + log(2.00 / 2.00)
pH = -log(1.85×10-5) + 0
pH = 4.74
300
You would add this to a solution of ammonia to make it a buffer.
ammonium?
300
The higher the Ksp, the more soluble the substance is.
False
False
400
0.200 M of acetic acid (Ka = 1.8x10-5) is titrated with 0.200 M NaOH.
What is the pH at half-equivalence point?
4.74
400
What reagent can be used to prepare a buffer that has hydrofluoric acid? and how much?
strong base, smaller amount of moles than HF.
400
Given two buffers:
A) 1000 mL of 5.00 M acetic acid and 5.00 M sodium acetate
B) 500 mL of 3.00 M acetic acid and 3.00 M sodium acetate
Does buffer A have a higher, lower or the same pH as buffer B?
The same
400
To increase the molar solubility of a salt, we can ____ the pH
decrease
500
Which titration curve belongs to the strongest acid?
the bottom curve
500
What reagent can be used to prepare a buffer that has sodium nitrite? and how much?
strong acid and a smaller amount of moles than nitrite
500
Given two buffers:
A) 1000 mL of 5.00 M acetic acid and 5.00 M sodium acetate
B) 500 mL of 3.00 M acetic acid and 3.00 M sodium acetate
Does buffer A have a higher, lower or the same resistance as buffer B?
higher
500
What is the Ksp expression for Ca3(PO4)2 in terms of x?
432x7