Waec Model Questions Vol1 2019 Chemistry Question 4

Practice essay / theory question 4 from the 2019 Waec Model Questions Vol1 Chemistry examination. This question covers Mole concept, Stoichiometry, Empirical formula, Percent composition, Transition metal colour .

Waec Model Questions Vol1 2019 Chemistry Essay / Theory
Topics: Mole concept Stoichiometry Empirical formula Percent composition Transition metal colour
Question 4 WAEC_MODEL_QUESTIONS_VOL1 • 2019 • CHEMISTRY • essay

The diagram shows the crystal structure of a hydrated copper(II) sulfate compound.

Question Parts

( a )
Write the correct molecular formula of the compound shown in the diagram.
( b )
A 2.00 g sample of the compound is dissolved in water and titrated with 0.100 M EDTA solution. The equivalence point is reached after 80.0 mL of EDTA. Calculate the mass percent of copper in the compound.
( c )
Using the mass percent of copper obtained in part (b) and the atomic mass of copper (63.55 g mol⁻¹), determine the formula mass of the compound and comment on whether it agrees with the formula you wrote in part (a).
( d )
Explain, with reference to the structure in the diagram, why the compound exhibits a characteristic blue colour.

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About This Question

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

The question covers Mole concept, Stoichiometry, Empirical formula, Percent composition, Transition metal colour .

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