Neco Model Questions Vol1 2019 Chemistry Question 4
Practice practical question 4 from the 2019 Neco Model Questions Vol1 Chemistry examination. This question covers Mole Concept, Gravimetric Analysis, Purity Determination .
A student performed a gravimetric analysis to determine the purity of an impure sample of copper(II) carbonate (CuCO₃). The procedure was as follows: 1. Accurately weigh 1.500 g of the impure sample and record the mass. 2. Dissolve the sample in dilute hydrochloric acid, precipitating copper(II) carbonate. 3. Filter the precipitate, wash it with de‑ionised water and dry it. 4. Transfer the dried precipitate to a crucible and heat strongly in a muffle furnace until a constant mass is obtained. The heating converts CuCO₃ to copper(II) oxide (CuO) according to: CuCO₃ → CuO + CO₂. 5. The final constant mass of CuO obtained is 0.845 g. Using the data above, answer the following questions.
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This is Neco Model Questions Vol1 2019 Chemistry Question 4. It is one of the practical questions from the 2019 Neco Model Questions Vol1 Chemistry examination.
The question covers Mole Concept, Gravimetric Analysis, Purity Determination .
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