Solution A contains the compound [Cu(H2O)6]Cl2 - AQA - A-Level Chemistry - Question 7 - 2017 - Paper 1
Question 7
Solution A contains the compound [Cu(H2O)6]Cl2.
1. State the type of bonding between the oxygen and hydrogen in this compound.
2. State why the chloride ions in th... show full transcript
Worked Solution & Example Answer:Solution A contains the compound [Cu(H2O)6]Cl2 - AQA - A-Level Chemistry - Question 7 - 2017 - Paper 1
Step 1
State the type of bonding between the oxygen and hydrogen in this compound.
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Answer
The type of bonding between the oxygen and hydrogen in the compound [Cu(H2O)6]Cl2 is covalent.
Step 2
State why the chloride ions in this compound are not considered to be ligands.
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Answer
Chloride ions are not considered to be ligands because they do not donate a lone pair for coordinate bonding with the copper ion.
Step 3
Write an ionic equation for the reaction that occurs when solution A is converted into solution B and state the colour of solution B.
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Step 4
Identify the blue-green solid C.
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Answer
The blue-green solid C is copper carbonate (CuCO3).
Step 5
Identify reagent D and write an ionic equation for the reaction that occurs when the yellow-green solution is formed from solution A.
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Step 6
Explain why colorimetry cannot be used to determine the concentration of solutions containing [CuCl2].
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Answer
Colorimetry cannot be used because [CuCl2] is colourless and cannot absorb frequencies of visible light. Its electron configuration does not allow for any d-d transitions, which are necessary for color absorption.
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