2019 - Q3
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Which of the following metal carbonates has the highest molar solubility?
A. Calcium carbonate
B. Copper(II) carbonate
C. Iron(II) carbonate
D. Lead(II) carbonate
2019 - Q11
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A saturated solution of barium carbonate was stored in a flask. Solid barium carbonate containing radioactive carbon-14 was added to the solution. The mixture was allowed to stand for several days and was then filtered.
Radioactivity could reasonably be expected to be found in
A. the filtrate only.
B. the residue only.
C. both residue and filtrate.
D. neither residue nor filtrate.
2021 - Q27 (6 marks)
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An experiment is carried out to determine the K sp value for lithium phosphate (Li3PO4). Five samples of Li+ ion solution were prepared, and a different solution of PO4 3− was added to each of them. Columns 2 and 3 of the table show the values before any reaction occurs.
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(a) Calculate the range within which the Ksp value of lithium phosphate lies.
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(b) Justify ONE way in which the procedure of this investigation could be improved to increase the accuracy of the calculated result.
2019 - Q17
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A student makes a solution with a final volume of 200 mL by mixing 100 mL of 0.0500 mol/ L barium nitrate solution with 100 mL of 0.100 mol/L sodium hydroxide solution.
Which row of the table correctly identifies if a precipitate will form under these conditions and the reason?
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2022 - Q35 (5 marks)
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A precipitate of strontium hydroxide Sr(OH)2, (MM = 121.63 g mol−1) was produced when 80.0 mL of 1.50 mol L−1 strontium nitrate solution was mixed with 80.0 mL of 0.855 mol L−1 sodium hydroxide solution. The mass of the dried precipitate was 3.93 g.
What is the Ksp of strontium hydroxide?
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2020 - Q11
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Equal volumes of two 0.04 mol L−1 solutions were mixed together. Which pair of solutions would give the greatest mass of precipitate?
A. Ba(OH)2 and MgCl2
B. Ba(OH)2 and MgSO4
C. Ba(OH)2 and NaCl
D. Ba(OH)2 and Na2SO4
2020 - Q17
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The following apparatus was set up in a temperature-controlled laboratory.
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Excess solid sodium hydroxide is added to the beaker.
Which row of the table correctly identifies the change in the CuSO4(s) mass and the colour of the solution after several days?
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2020 - Q20
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The graph shows the concentration of silver and chromate ions which can exist in a saturated solution of silver chromate.
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Based on the information provided, what is the Ksp for silver chromate?
A. 1.1 × 10^−8
B. 2.2 × 10^−8
C. 1.1 × 10^−12
D. 4.4 × 10^−12
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2021 - Q2
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2021 - Q20
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2021 - Q17​
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A 2.0 g sample of silver carbonate (MM = 275.81 g mol−1) was added to 100.0 mL of water in a beaker. The solubility of silver carbonate at this temperature is 1.2 × 10−4 mol L−1. It was then diluted by adding another 100.0 mL of water.
What is the ratio of the concentration of silver ions in solution before and after dilution?
A. 1 : 1
B. 1 : 2
C. 2 : 1
D. 4 : 1
2022 - Q19
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What is the molar solubility of iron(II) hydroxide?
A. 2.3 × 10−6 mol L−1
B. 2.9 × 10−6 mol L−1
C. 3.7 × 10−6 mol L−1
D. 4.9 × 10−9 mol L−1​