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What is the dilution formula?
M1V1=M2V2
Which of the following acids (listed with pKa values) and their conjugate base would form a buffer
with a pH of 8.10?
A) HClO, pKa = 7.54
B) HNO2, pKa = 3.34
C) HC2H3O2, pKa = 4.74
D) H2SO3, pKa = 1.77
E) HIO, pKa = 10.64
HClO
Which of the following titration mixtures will produce an equivalence point pH which is less than 7?
1: KOH + HClO3
2: HF + LiOH
3: HCl + NH3
4: HBr + Ba(OH)2
NH3+ HCl
Write the Ksp of the following compound:
Ca3(PO4)2
Ksp= [Ca+2 ]3 + [PO4-3]2
Find the concentration of NaCl in the resulting solution if 25.00 mL of 0.100 M NaCl are combined with 25.00 mL of 0.100 KI
0.0500 M
Calculate the pH of a solution containing 0.090 M nitrous acid (HNO2, Ka = 4.5 x 10-4) and 0.20 M potassium nitrite
(KNO2)
3.70
Which of the following will produce an equivalence pH point of 7?
1: NaOH +HCl
2: NH3 + HCl
3: HF + LiOH
NaOH + HCl
A saturated solution of MgF2 is prepared @ 27C. The concentration of Mg ions in the solution is 1.2 x 10-3. What is the Ksp for MgF2?
6.9 x 10-9
The Ka of benzoic acid is 6.30 × 10-5. The pH of a buffer prepared by combining 50.0 mL of 1.00 M
potassium benzoate and 50.0 mL of 1.00 M benzoic acid is
4.201
Calculate the pH of a buffer composed of 0.20 M benzoic acid and 0.50 M sodium benzoate using an ice chart
Ka benzoic acid= 6.3 x 10-5
4.60
Will the pH of a titration curve of a strong base being titrated with a strong acid begin above 7 or below?
Above 7
The Ksp for Cu(N3)2 is 6.3 x 10-10. What is the solubility of Cu(N3)2 in g/L?
The molar mass of Cu(N3)2 is147.6 g/mol
8.0 x 10-2 g/L
Which one of the following pairs cannot be mixed together to form a buffer solution?
A) RbF, HF
B) H2SO3, KHSO3
C) NaCl, HCl
D) HONH2, HONH3Cl
E) KNO2, HNO2
NaCl, HCl
What chemicals would be the best choice for a buffer with a pH close to 4?
1: Nitrous acid Ka= 5.6 x 10-4
2: Formic acid Ka= 1.8 x 10 -4
3: Hypochlorous acid Ka= 4.0 x 10-8
Formic acid and its conjugate base
A 20.00 mL sample of 0.200 HBr is titrated with 0.200 M Ca(OH)2. Calculate the pH of the solution after the following volumes of base have been added:
1: 7.0 mL
2: 9.6 mL
1: 1.02
2: 1.15
Which is the least soluble?
Compound Ksp
AgCl 1.8 x 10-10
AgI 1.5 x 10-16
Ag2CrO4 9.0 x 10-12
AgI
The pH of a solution prepared by mixing 50.0 mL of 0.125 M KOH and 50.0 mL of 0.125 M HCl is
7
The pH of a solution prepared by dissolving 0.350 mol of solid methylamine hydrochloride
(CH3NH3Cl) in 1.00 L of 1.10 M methylamine (CH3NH2) is ________. The Kb for methylamine is
4.40 × 10-4. (Assume the final volume is 1.00 L.)
11.14
The value of the Ksp for cerium hydroxide Ce(OH)3 is 1.5 x 10-20. What is the solubility in
a) pure water
b) 0.10 NaOH
a: 4.9 x 10-6 M
b: 1.5 x 10-7 M