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WorksheetsGrade 12 - Equilibria
Total questions: 15
Worksheet time: 14mins
The equilibrium constant, Kc, for the reaction to form ethyl ethanoate from ethanol and ethanoic acid,
C2H5OH + CH3CO2H → CH3CO2C2H5 + H2O,
at 60oC is 4.00.
When 1.00 mol each of ethanol and ethanoic acid are allowed to reach equilibrium at 60oC, what is the number of moles of ethyl ethanoate formed?
31
32
41
43
Which of the following could act as buffer solutions?
NaHCO3 and Na2CO3
CH3CO2H and NaCl
HNO3 and NaNO3
Ba(OH)2 and BaCl2
Which of the following can act as a Bronsted-Lowry acid?
H3O+
OH-
CH3COO-
NH2-
The pH of a 1.0 mol dm-3 solution of a weak monobasic acid is 4. What is the dissociation constant of the weak acid?
1.0 x 10-2 mol dm-3
1.0 x 10-4 mol dm-3
1.0 x 10-7 mol dm-3
1.0 x 10-8 mol dm-3
An acidified solution containing 0.10 mol dm-3 of zinc sulphate and 0.10 mol dm-3 of copper(II) sulphate is saturated with hydrogen sulphide at 15oC. The concentration of S2-(aq) in the solution is then 10-35 mol dm-3.
The solubility product of zinc sulphide at 15oC is 10-24 mol2 dm-6 and of copper(II) sulphide is 10-40 mol2 dm-6.
Which statement describes what happens in the solution?
No precipitate is formed
Copper(II) sulphide only is precipitated
Copper(II) sulphide is precipitated first, followed by zinc sulphide
Zinc sulphide is precipitated first, followed by copper(II) sulphide
Stomach juices have a pH of 1.0. aspirin is a monobasic acid represented by HA (Ka = 10-4 mol dm-3) which dissociation into ions H+ and A-. What are the relative concentrations of H+, A- and HA when aspirin from a tablet enters the stomach?
[H+] > [HA] > [A-]
[HA] > [H+] = [A-]
[H+] > [A-] > [HA]
[H+] = [A-] > [HA]
Which one of the following acid solution can be used to give an effective buffer solution at a pH < 7 by partial neutralization with aqueous NaOH?
0.01 mol dm-3 CH3CO2H
0.1 mol dm-3 HI
0.01 mol dm-3 HCl
0.1 mol dm-3 HNO3
Which statement explains the observation that magnesium hydroxide dissolves in aqueous ammonium chloride, but not in aqueous sodium chloride?
ionic radius of the NH4+ ion is similar to that of Mg2+ but not that of Na+
NH4Cl dissociates less fully than NaCl.
The ions Na+ and Mg2+ are isoelectronic (have the same number of electrons).
The ion NH4+ acts as an acid.
Why is ethanoic acid a stronger acid in liquid ammonia than in its aqueous solution
ammonia is a stronger base than water
ammonium ethanoate is completely ionized in aqueous solution
ammonium ethanoate is strongly acidic in aqueous solution
liquid ammonia is a more polar solvent than water
Which of the following shows the correct dissolution reaction for BaCl2?
Given that the molar solubility of Sn(OH)2 is "s".
The correct mathematical expression for solubility product constant of Sn(OH)2 is:
2s2 = Ksp
2s3 = Ksp
4s3 = Ksp
8s3 = Ksp
Precipitation of silver chloride , AgCl will occur when
Qsp = Ksp
Qsp > Ksp
Qsp < Ksp
Removing O2(g) will
Changes in pressure in equilibrium reaction will only affect substances that are in the __________ state.
gaseous
liquid
solid
plasma
