Gce Model Questions Vol1 2019 Chemistry Question 4

Practice essay / theory question 4 from the 2019 Gce Model Questions Vol1 Chemistry examination. This question covers mole concept, stoichiometry, coordination chemistry .

Gce Model Questions Vol1 2019 Chemistry Essay / Theory
Topics: mole concept stoichiometry coordination chemistry
Question 4 GCE_MODEL_QUESTIONS_VOL1 • 2019 • CHEMISTRY • essay
Gce Model Questions Vol1 2019 Chemistry Question 4 diagram

The diagram shows the structural formula of the coordination compound [Co(NH₃)₅Cl]Cl₂·H₂O. The sample is dissolved in water and the solution is diluted to a final volume of 250.0 mL. Answer the following questions.

Question Parts

( a )
Write the correct empirical formula for the compound and state the oxidation state of the cobalt ion.
( b )
Calculate the molar mass of the compound (to three significant figures).
( c )
A 2.50 g sample of the compound is dissolved and diluted as described. Calculate:
( ) The number of moles of cobalt present in the solution.
( ) The concentration of chloride ions (free outer‑sphere chloride only) in the solution.
( d )
The solution is titrated with a standard AgNO₃ solution (0.200 mol L⁻¹) to precipitate all free chloride ions. If 25.0 mL of the AgNO₃ solution is required, calculate the percentage purity of the original 2.50 g sample with respect to the compound (assume any impurity does not contain chloride).

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About This Question

This is Gce Model Questions Vol1 2019 Chemistry Question 4. It is one of the essay questions from the 2019 Gce Model Questions Vol1 Chemistry examination.

The question covers mole concept, stoichiometry, coordination chemistry .

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