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6 (a) 3.14g of solid copper sulfate was dissolved in water and made up to 250 cm³ of solution - Edexcel - GCSE Chemistry - Question 6 - 2022 - Paper 1
Question 6
6 (a) 3.14g of solid copper sulfate was dissolved in water and made up to 250 cm³ of solution. Calculate the concentration of this copper sulfate solution in g dm⁻³... show full transcript
Worked Solution & Example Answer:6 (a) 3.14g of solid copper sulfate was dissolved in water and made up to 250 cm³ of solution - Edexcel - GCSE Chemistry - Question 6 - 2022 - Paper 1
Step 1
Calculate the concentration of this copper sulfate solution in g dm⁻³.
Answer
To find the concentration, we use the formula:
ext{concentration (g dm}^{-3} ext{)} = rac{ ext{mass of solid (g)}}{ ext{volume of solution (dm}^{3} ext{)} }Here, the mass of solid copper sulfate is 3.14 g and the volume of the solution is 250 cm³, which is equivalent to 0.250 dm³.
Plugging in the values:
ext{concentration} = rac{3.14 ext{ g}}{0.250 ext{ dm}^3} = 12.56 ext{ g dm}^{-3}Step 2
Step 3
Step 4
Describe how to obtain a pure, dry sample of the precipitate of copper hydroxide from the reaction mixture.
Answer
To obtain a pure, dry sample of copper hydroxide, follow these steps:
- Filter the mixture to separate the blue precipitate of copper hydroxide from the sodium sulfate solution.
- Rinse the precipitate with distilled water to remove impurities.
- Allow the filter paper with the precipitate to dry in air or place it in a warm oven to expedite the drying process.
- Once dry, carefully remove the copper hydroxide from the filter paper to obtain a pure sample.