Triple Chemistry revion on water testing, by Mimi
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Who checks the purity and the safety of our water? | Analytic chemists
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| What is qualitative analysis? | The investigation of the kind of substances present in a sample
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| What is quantitative analysis? | The measuring of the amount of each substance present in a sample
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| What are cations? | Positive ions
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| What are anions? | Negative ions
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| What are ionic compounds made of? | Cations and anions
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| What does water often contain? (dissolved) | Ionic compounds
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| How do analytic chemists indentify unknown ionic compounds? | By carrying out tests for each ion
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| What is needed to identify a compound? | Both the anion and the cation
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| What must an ion test give? | Positive results with only one type of ion
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| What can be used to detect some metal cations? | A flame test
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| What flame colour is calcium? | Brick red
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| What flame colour is sodium? | Yellow
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| What flame colour is potassium? | Lilac
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| What flame colour is copper? | Green/blue
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| How can you test for other cations? | By adding a few drops of sodium hydroxide solution to the unknown substance
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| Why does adding a few drops of sodium hydroxide solution to an unknown substance work? | Because many metal hydroxides are insoluble, so a precipitate reaction can occur
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| What is the colour of the solid formed by the precipitation of aluminium? | White (when excess sodium hydroxide is added, the precipitate redissolves to form a colourless solution)
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| What is the colour of the solid formed by the precipitation of calcium? | White (when excess sodium hydroxide is added, the precipitate remains the same)
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| What is the colour of the solid formed by the precipitation of copper(II)? | Pale blue
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| What is the colour of the solid formed by the precipitation of iron(II)? | Green
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| What is the colour of the solid formed by the precipitation of iron(III)? | Brown (rust)
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| How will the name of the precipitate formed be formed? | It will be a solid hydroxide of the solution
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Created by:
MimiMettle
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