4.7 Anion Tests
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what is an anion
a negative ion
what two solutions are required to test for halides
HNO3 (Nitric acid) and AgNO3 (Silver Nitrate)
why is HNO3 used as well as AgNO3
reacts with other anions present to prevent false positives
what ions are present in a halide test if the ppt is white
Chloride ions
what ions are present in a halide test if the ppt is cream
Bromide ions
what ions are present in a halide test if the ppt is yellow
Iodide ions
what colour is the ppt form when Iodide ions are present
yellow
what colour is the ppt form when Chloride ions are present
white
what colour is the ppt form when bromide ions are present
cream
what is the charge on a carbonate ion
CO3^2-
what substance is added to a sample to test for CO3 ions
HCl
what gas is produced when a carbonate and hydrochloric acid react together
carbon dioxide
give the reaction whe HCl is added to a sample with carbonate ions
effervescence
what is the charge on a sulphate ion
2-
what are the two substances that are added to test for sulphates
HCl and BaCl2
what is the positive reaction for a sulphate ion when Barium Chloride is added
white ppl forms
what is the name of the ppt of a sulphate
barium silphate
what is the indicator that BaCl must be added to test for a Sulphate after the HCl is added
no effervescence
why is it important to add hcl first when testing for Carbonates and Sulphates
because sulphates also form white ppt in BaCl