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 this compound are not considered to be ligands. 3. An excess of ammonia was added to a sample of solution A to form solution B. Write an ionic equation for the reaction that occurs when solution A is converted into solution B and state the colour of solution B. Equation Colour 4. Aqueous sodium carbonate was added to another sample of solution A to form a blue-green solid C. Identify the blue-green solid C. 5. Reagent D was added to another sample of solution A to form a yellow-green solution. Identify reagent D and write an ionic equation for the reaction that occurs when the yellow-green solution is formed from solution A. Identify of reagent D Equation 6. Explain why colorimetry cannot be used to determine the concentration of solutions containing [CuCl2]. In your answer refer to the electron configuration of the metal ion.

A-Level AQA Chemistry Types of Bonding & Properties: Solution A contains the compound

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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Answer

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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Answer

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.

Solution A contains the compound [Cu(H2O)6]Cl2 - AQA - A-Level Chemistry - Question 7 - 2017 - Paper 1

Worked Solution & Example Answer:Solution A contains the compound [Cu(H2O)6]Cl2 - AQA - A-Level Chemistry - Question 7 - 2017 - Paper 1

State the type of bonding between the oxygen and hydrogen in this compound.

State why the chloride ions in this compound are not considered to be ligands.

Write an ionic equation for the reaction that occurs when solution A is converted into solution B and state the colour of solution B.

Identify the blue-green solid C.

Identify reagent D and write an ionic equation for the reaction that occurs when the yellow-green solution is formed from solution A.

Explain why colorimetry cannot be used to determine the concentration of solutions containing [CuCl2].

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