Changes

First The test for [[Halide]] [[anion]]s begins by adding dilute [[Nitric Acid]] to remove any possible [[Carbonate]]s. Then [[Silver Nitrate]] is added to form a [[precipitate]] of [[Silver Halide]].<chem>NaCl(aq) + AgNO3(aq) -> NaNO3(aq) + AgCl(s)</chem>: A white [[precipitate]] is formed.<chem>NaBr(aq) + AgNO3(aq) -> NaNO3(aq) + AgBr(s)</chem>: A cream coloured [[precipitate]] is formed.<chem>NaI(aq) + AgNO3(aq) -> NaNO3(aq) + AgI(s)</chem>: A yellow [[precipitate]] is formed.====Sulphates====The test for [[Sulphate]] [[anion]]s begins by adding dilute [[Hydrochloric Acid]] to remove any possible [[Carbonate]]s. Then [[Barium Chloride]] is added to form a [[precipitate]] of [[Barium Sulphate]].<chem>Na2SO4(aq) + BaCl2(aq) -> 2NaCl(aq) + BaSO4(s)</chem>: A white [[precipitate]] is formed.====Carbonates====The test for [[carbonate]] [[anion]]s begins by adding [[Hydrochloric Acid]] to the [[solution]]. This [[product|produces]] a [[gas]] which is collected and bubbled through [[Limewater]] to identify if [[Carbon Dioxide]] has been [[product|produced]]. If [[Carbon Dioxide]] has been [[product|produced]] then the [[Limewater]] will turn from [[transparent]] to cloudy.<chem>Na2CO3(aq) + 2HCl(aq) -> 2NaCl(aq) + H2O(l) + CO2(g)</chem>: A [[gas]] is [[product|produced]] and bubbled through [[Limewater]].<chem>CO2(g) + CaO(aq) -> CaCO3(s)</chem>: The [[Calcium Carbonate]] makes the [[Limewater]] appear cloudy.