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Calcium nitrate solution reacts with sodium carbonate solution - Edexcel - GCSE Chemistry - Question 4 - 2013 - Paper 1
Question 4
Calcium nitrate solution reacts with sodium carbonate solution. The products are calcium carbonate and another salt. Write the word equation for this reaction. (b... show full transcript
Worked Solution & Example Answer:Calcium nitrate solution reacts with sodium carbonate solution - Edexcel - GCSE Chemistry - Question 4 - 2013 - Paper 1
Step 1
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Step 3
Describe how a flame test is carried out on a solid.
Answer
To carry out a flame test on a solid, follow these steps:
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Clean the Wire: Use a clean wire for the flame test, ideally made of platinum or nichrome. Clean it with hydrochloric acid to remove any impurities.
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Sample the Solid: Dip the clean wire into the solid sample of the material to be tested.
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Test in Flame: Hold the wire in the Bunsen burner flame. Observe the color produced in the flame.
Step 4
Calculate the percentage yield of carbon dioxide in this reaction.
Answer
To calculate the percentage yield of carbon dioxide, use the formula:
ext{Percentage yield} = rac{ ext{actual yield}}{ ext{theoretical yield}} imes 100
Given: Actual yield = 40 g, Theoretical yield = 44 g
Plugging the values in:
ext{Percentage yield} = rac{40g}{44g} imes 100 \\ = 90.9\%
Step 5
Suggest a reason why only 40 g of carbon dioxide was formed in the experiment.
Answer
A possible reason for only producing 40 g of carbon dioxide could be that the reaction was incomplete, or that not all of the calcium carbonate was heated adequately. Additionally, other factors such as gas escaping or not all carbon dioxide being collected could also contribute to the lower yield.
Step 6