Flashcards
Testing for Elements
Cards in this deck (5)
- 1Test 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 paperTest 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 - 2Test for NH3 -Smells of stale urine -Made by heating an Ammonium coumpound with Sodium Hydroxide -The only alkali gas -IT TURNS RED LITMUS PAPER BLUETesting for Cations
Some give a characteristic colour in a flame
Li- deep red (crimson)
Na- Orange
K-Lilac
Ca-Brick Red - 3Not 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 testWe add 2cm3 of each substance to a test tube
We add NaOH drop by drop using a teat pipette - 4Iron(II) Sulphate-Dark Green Participate Iron(III) Sulphate-Orange Participate Copper Sulphate-Blue ParticpateThe 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 - 5Testing for Anions Add dilute Nitric acid, followed by Silver Nitrate solution Chloride Compound-White Percipitate Bromide Compound-Cream Percipitate Iodide Compound- Yellow PrcipitateTest 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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- Cambridge IGCSE Chemistry (Periodic Table) Flashcards on Testing for Elements, created by Konrad O'Neill on 01/08/2013.
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- Konrad O'Neill
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