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Water Testing

Triple Chemistry revion on water testing, by Mimi

QuestionAnswer
Who checks the purity and the safety of our water? Analytic chemists
What is qualitative analysis? The investigation of the kind of substances present in a sample
What is quantitative analysis? The measuring of the amount of each substance present in a sample
What are cations? Positive ions
What are anions? Negative ions
What are ionic compounds made of? Cations and anions
What does water often contain? (dissolved) Ionic compounds
How do analytic chemists indentify unknown ionic compounds? By carrying out tests for each ion
What is needed to identify a compound? Both the anion and the cation
What must an ion test give? Positive results with only one type of ion
What can be used to detect some metal cations? A flame test
What flame colour is calcium? Brick red
What flame colour is sodium? Yellow
What flame colour is potassium? Lilac
What flame colour is copper? Green/blue
How can you test for other cations? By adding a few drops of sodium hydroxide solution to the unknown substance
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
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)
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)
What is the colour of the solid formed by the precipitation of copper(II)? Pale blue
What is the colour of the solid formed by the precipitation of iron(II)? Green
What is the colour of the solid formed by the precipitation of iron(III)? Brown (rust)
How will the name of the precipitate formed be formed? It will be a solid hydroxide of the solution
Created by: MimiMettle