Chemistry: Preparing a Soluble Salt + Practical Copper (II) sulfate

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4 Terms

1
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What must you do to prepare soluble salt from a insoluble reactant?

a reaction with an acid and an insoluble base.

2
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Describe the steps to prepare a soluble salt from a insoluble reactant.

  1. the insoluble reactant is added in excess to ensure that all of the acid has reacted

  2. filter out the excess reactant so only salt and water remain.

  3. gently heat the salt solution to concentrate it as water evaporates

  4. crystals will start to form.

Evaporating over a period of days allows for larger crystals.

3
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What are the steps in the practical to Prepare Copper(II) Sulfate starting from copper(II) oxide?

Add 50 cm3 dilute acid into a beaker and warm gently using a Bunsen burner

  1. Add the copper(II) oxide slowly to the hot dilute acid and stir until the base is in excess

  2. Filter the mixture into an evaporating basin to remove the excess base

  3. Gently heat the solution in a water bath or with an electric heater to evaporate the water and to make the solution saturated

  4. Check the solution is saturated by dipping a cold glass rod into the solution and seeing if crystals form on the end

  5. Leave the filtrate in a warm place to dry and crystallise

  6. Decant excess solution and allow the crystals to dry

<p>Add 50 cm<sup>3</sup>&nbsp;dilute acid into a beaker and warm gently using a Bunsen burner</p><ol><li><p>Add the copper(II) oxide slowly to the hot dilute acid and stir until the base is in excess</p></li><li><p>Filter the mixture into an evaporating basin to remove the excess base</p></li><li><p>Gently heat the solution in a water bath or with an electric heater to evaporate the water and to make the solution saturated</p></li><li><p>Check the solution is saturated by dipping a cold glass rod into the solution and seeing if crystals form on the end</p></li><li><p>Leave the filtrate in a warm place to dry and crystallise</p></li><li><p>Decant excess solution and allow the crystals to dry</p></li></ol><p></p>
4
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what do hydrated copper (II) sulfate crystals look like?

bright blue and regularly shaped