4. (a) 3.14 g 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. (b) Sodium hydroxide solution was added to a solution of copper sulfate. A precipitate of copper hydroxide and a solution of sodium sulfate were formed. (i) State what would be seen in the reaction. (ii) Complete the balanced equation for the reaction by adding a number in front of NaOH. NaOH + CuSO₄ → Cu(OH)₂ + Na₂SO₄ (iii) Describe how to obtain a pure, dry sample of the precipitate of copper hydroxide from the reaction mixture.

GCSE Edexcel Chemistry Combined Science Reactions of acids: 4. (a) 3.14 g of solid copper su

4. (a) 3.14 g of solid copper sulfate was dissolved in water and made up to 250 cm³ of solution - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2022 - Paper 1

Question 4

4. (a) 3.14 g 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... show full transcript

Worked Solution & Example Answer:4. (a) 3.14 g of solid copper sulfate was dissolved in water and made up to 250 cm³ of solution - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2022 - Paper 1

Step 1

Calculate the concentration of copper sulfate solution in g dm⁻³

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Answer

To calculate the concentration, use the formula:

$\text{concentration (g dm}^{-3}) = \frac{\text{mass of solid (g)}}{\text{volume of solution (dm}^3)}$

First, convert the volume from cm³ to dm³:

$250 \text{ cm}^3 = 0.250 \text{ dm}^3$

Now, plug in the mass and volume:

$\text{concentration} = \frac{3.14 \text{ g}}{0.250 \text{ dm}^3} = 12.56 \text{ g dm}^{-3}$

Step 2

State what would be seen in the reaction

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Answer

A blue precipitate of copper hydroxide will form during the reaction.

Step 3

Complete the balanced equation for the reaction by adding a number in front of NaOH

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Answer

The balanced equation is:

$2 \text{NaOH} + \text{CuSO}_4 \rightarrow \text{Cu(OH)}_2 + \text{Na}_2\text{SO}_4$

Step 4

Describe how to obtain a pure, dry sample of the precipitate of copper hydroxide from the reaction mixture

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Answer

To obtain a pure, dry sample of copper hydroxide:

Filter the reaction mixture to separate the solid precipitate from the liquid solution.
Wash the residue with distilled water to remove any impurities.
Leave the precipitate in a warm place to dry, or use filter paper to pat it dry.

4. (a) 3.14 g of solid copper sulfate was dissolved in water and made up to 250 cm³ of solution - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2022 - Paper 1

Worked Solution & Example Answer:4. (a) 3.14 g of solid copper sulfate was dissolved in water and made up to 250 cm³ of solution - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2022 - Paper 1

Calculate the concentration of copper sulfate solution in g dm⁻³

State what would be seen in the reaction

Complete the balanced equation for the reaction by adding a number in front of NaOH

Describe how to obtain a pure, dry sample of the precipitate of copper hydroxide from the reaction mixture

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