Neco Model Questions Vol1 2023 Chemistry Question 4
Practice practical question 4 from the 2023 Neco Model Questions Vol1 Chemistry examination. This question covers Mole Concept .
A gravimetric analysis is carried out to determine the amount of calcium carbonate (CaCO₃) present in a sample of limestone. Procedure and data: 1. A 1.250 g portion of powdered limestone is accurately weighed. 2. The sample is dissolved in excess dilute HCl. 3. Excess ammonium oxalate solution is added, precipitating calcium oxalate, CaC₂O₄·H₂O. 4. The precipitate is filtered, washed with distilled water and dried at 110 °C to constant mass, giving 0.842 g of calcium oxalate. 5. The dried precipitate is then heated in a muffle furnace at 600 °C until conversion to calcium oxide (CaO) is complete. The final mass of CaO obtained is 0.456 g. Using the data above, answer the following questions:
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This is Neco Model Questions Vol1 2023 Chemistry Question 4. It is one of the practical questions from the 2023 Neco Model Questions Vol1 Chemistry examination.
The question covers Mole Concept .
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