Qualitative Analysis

Solution X turns acidified potassium dichromate(VI) from orange to green. What must solution X contain?

Aqueous sodium hydroxide reacts with a metal ion producing a colored precipitate. This precipitate changes color on standing. What is the ion present?

An excess of aqueous ammonia and aqueous sodium hydroxide was gradually added to solution X in two separate experiments. In both experiments, a precipitate was obtained which dissolved in an excess of the added reagent. What could X contain?

Which compounds in solution produces a precipitate with aqueous ammonia that does not dissolve when an excess of ammonia is added?

A pale green solution X gives a green precipitate with excess aqueous sodium hydroxide. An alkaline gas is only given off when the mixture is warmed with powdered aluminium. Which ions does X contain?

Wastewater from a factory was found to have a pH value of 2. Which substance could be used to neutralize the wastewater before it is released into the river?

An excess of sodium hydroxide is added to an aqueous solution of salt X and boiled. Ammonia gas is only given off after aluminium foil is added to the hot solution. What could X contain?

An excess of dilute sulfuric acid reacts with both aqueous barium hydroxide and aqueous barium chloride. In what way are the two reactions the same?

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