AS 91162 Carry out procedures to identify ions present in solution
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Transcript of AS 91162 Carry out procedures to identify ions present in solution
• 3 credits internally assessed.• Practical component with written
answers.
This topic covers: Qualitative – definitions of solubilitySolubility rulesIdentifying ionsBalancing ionic equationsComplex ions Balancing complex ion equations
AS 91162 Carry out procedures to identify ions present in solution
Made up of +ve and -ve ions
+ve -ve
Cation Anion
Held together by the electrostatic attraction between the +ve and -ve charges.
Overall ionic compounds are neutral.
What are ions?
A liquid mixture of solute (solid) dissolved in solvent (liquid).
Note: Most of the H+ and OH- combine to form H2O.
What’s a solution?
Question: How do we know what ions are present in a solution?
So what’s the ‘solution’ to this problem?
1. Taste the chemicals?2. See the chemicals?3. Feel the chemicals?4. Try putting other chemicals to
see if it reacts?5. Or just ask whoever made the
chemicals?
This type of experiment is called Qualitative analysis which is about finding out what is there.
Qualitative – an analysis using qualities such as colour change, smell or precipitation (cloudiness)
Quantitative – an analysis using quantities like volume, mass or amount
Quality not quantity.
It turns out that many ions are colored (especially the metal ones) and is easily identifiable, now lets observe some chemicals and note down the color of them.
Practical