Waec 2023 Chemistry Question 4

Practice essay / theory question 4 from the 2023 Waec Chemistry examination. This question covers General .

Waec 2023 Chemistry Essay / Theory
Topic: General
Question 4 WAEC • 2023 • CHEMISTRY • essay

Starting with calcium chloride, describe briefly how a solid sample of calcium trioxocarbonate (IV) can be prepared in the laboratory.

Question Parts

( a )
(b) With relevant equations outline the procedure for the purification of impure copper.
( c )
(i) Copper reacts with concentrated trioxonitrate (V) acid: write a balanced chemical equation for the reaction; (ii) state what would be observed in the reaction; (iii) state why the copper is oxidized; (iv) an excess of copper is added to 25.0 cm³ of 16.0 mol dm⁻³ NHO₃. Calculate the volume of the gas formed at s.t.p. [H=1.0, N=14.0, O=16.0, Cu=63.0; Molar volume of gas at s.t.p. =22.4 cm³]
( d )
(i) Pure HNO₃ is a colourless liquid but when exposed to air, it turns yellow-ish-brown in colour. Explain briefly this observation. (ii) Write a balanced equation for the laboratory preparation of hydrogen trioxonitrate (V) acid.

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About This Question

This is Waec 2023 Chemistry Question 4. It is one of the essay questions from the 2023 Waec Chemistry examination.

The question covers General .

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