Chemical testing for ions
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OCR SCIENCE – UNIT 1 BEST PRACTICE. Chemical testing for Ions. Prior learning Chemicals can react together and change colour Key words React, precipitate, colour change, identify, Cations, Anions. OCR SCIENCE – UNIT 1 BEST PRACTICE.

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Chemical testing for Ions

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Chemical testing for ions

OCR SCIENCE – UNIT 1 BEST PRACTICE

Chemical testing for Ions

  • Prior learning

  • Chemicals can react together and change colour

  • Key words

  • React, precipitate, colour change, identify, Cations, Anions


Chemical testing for ions

OCR SCIENCE – UNIT 1 BEST PRACTICE

I am learning to: identify cations and anions in different solutions by their colour change

I will be successful if I can:

  • Describe the term cation and anion and explain the test to be carried out

  • Carry out a practical activity safely (having completed a risk assessment) to confirm the presence of different cations an anions

  • Complete a table to show results of practical tests

  • Conclude, Evaluate and comment on reliability of the test

    Outcome: I can identify unknown ions in a given solution.

    TO ACHIEVE A MERIT:

  • Add DETAIL to your report by explaining what is happening in each step using the guidance sheets.

  • Relate the results of the test back to the scenario of students becoming ill having played on the playing fields.

  • Complete an aim, prediction and method in handwritten form to add to your testing notes.

    Any of these can be completed at home or with Ms C’s help at break, lunch or after school.


Introduction what are ions

I am learning to:identify cations and anions in different solutions by their colour change

Introduction: what are ions?

  • Ions are charged particles.

  • Positively charged particles are called CATIONS (because they are attracted to the negative electrode called the cathode which are usually metals)

  • Negative Ions are called ANIONS because they are attracted to the anode these are usually non-metals

CuSO4

Cu 2+

SO4-


Reference

I am learning to:identify cations and anions in different solutions by their colour change

Ion

Test

Result

Chloride

Add Silver nitrate Solution

White precipitate

Sulphate

Add acidified Barium chloride solution

White precipitate

Carbonate

Add dilute acid and test gas with limewater

Milky white precipitate

Copper (Cu++)

Add Sodium hydroxide solution

Blue precipitate

Iron

Add Sodium hydroxide solution

Brown precipitate

Reference


Reference1

I am learning to:identify cations and anions in different solutions by their colour change

Reference

Copper Cations

Sodium hydroxide

Iron Cations


Reference2

I am learning to:identify cations and anions in different solutions by their colour change

Reference

Carbonate Anions

Acid

Chloride Anions

Silver Nitrate


Reference3

I am learning to:identify cations and anions in different solutions by their colour change

Reference

Sulphate Anions

Barium Chloride


Risk assessment

I am learning to:identify cations and anions in different solutions by their colour change

Risk Assessment

What is the overall level of risk?(Tick appropriate box – if risk is high further steps must be taken to

minimum the risk of the procedure)

x


Results

I am learning to:identify cations and anions in different solutions by their colour change

Test

Samples

Add Silver nitrate solution

Add acidified Barium chloride solution

Add dilute acid and bubble gas through limewater

Add Sodium hydroxide

Sample ion

Results

A

B

C

Soil

Water


Results1

I am learning to:identify cations and anions in different solutions by their colour change

Results


Conclusion of findings

I am learning to:identify cations and anions in different solutions by their colour change

Conclusion of findings

  • Conclusion of findings:

    ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________


Reliability

I am learning to:identify cations and anions in different solutions by their colour change

Reliability

  • Do qualitative tests tell you how much of a substance is present?

    No, just if the substance is present

    2. If the test substance is a mixture will one get clear results?

    No more than one result may show

    3. Will the tests work if the substance is insoluble?

    no

    4. Is there an amount of substance needed to get a positive test?

    Small amounts of each substance should work

    5. Can your test substances be contaminated?

    Yes if clean pipettes are not used


Homework

I am learning to: view samples using a microscope and test samples for metals using flame tests

HOMEWORK

Complete the associated worksheet on Chemical tests

Approx. 10mins


Chemical testing for ions

OCR SCIENCE – UNIT 1 BEST PRACTICE

I am learning to: identify cations and anions in different solutions by their colour change

I will be successful if I can:

  • Describe the term cation and anion

  • Carry out a practical activity safely to confirm the presence of different cations an anions

  • Complete a table to show results of practical tests

    Outcome: I can identify unknown ions in a given solution.


Summary draw the colour changes of each test on plain paper

I am learning to:identify cations and anions in different solutions by their colour change

Summary – draw the colour changes of each test on plain paper

Copper Cations

Sodium hydroxide

Iron Cations


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