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Created by Konrad O'Neill
about 11 years ago
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Question | Answer |
Test for H- lighted splint goes out with a squeaky pop Test for O- glowing splint lights Test for CO2- limewater goes cloudy Test for Cl- bleaches damp red and blue litmus paper | Test for H2O purity - pure water boils at 100C -If water is impure than it boils higher than 100C -NB if water is impure it freezes below 0C hence salt on road in winter |
Test for NH3 -Smells of stale urine -Made by heating an Ammonium coumpound with Sodium Hydroxide -The only alkali gas -IT TURNS RED LITMUS PAPER BLUE | Testing for Cations Some give a characteristic colour in a flame Li- deep red (crimson) Na- Orange K-Lilac Ca-Brick Red |
Not many Cations give colours in a flame therefore we have to use a different test Adding Sodium Hydroxide solution we can identify 4 with this test | We add 2cm3 of each substance to a test tube We add NaOH drop by drop using a teat pipette |
Iron(II) Sulphate-Dark Green Participate Iron(III) Sulphate-Orange Participate Copper Sulphate-Blue Particpate | The 4th Cation is Ammonium however it doesnt form a participate, but on gentle heating Ammonia gas is given off Smell of stale urine and red litmus turns blue |
Testing for Anions Add dilute Nitric acid, followed by Silver Nitrate solution Chloride Compound-White Percipitate Bromide Compound-Cream Percipitate Iodide Compound- Yellow Prcipitate | Test for SO4- add dilute HCl followed by BaCl2, which should form a white percipitate BaSO4 Test for CO3- add acid, Carbon Dioxide will be given off which turns lime water cloudy |
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