Identification Of Ions By Chemical And Spectroscopic Means (chemistry Only) (GCSE Chemistry)

In flame tests, why is a platinum or nichrome wire cleaned in hydrochloric acid and then placed in a blue Bunsen flame before testing?

Which flame test colour is characteristic of sodium ions?

Which cation gives a brick-red colour in a flame test and can be confirmed by its specific emission lines?

Which of the following observations indicates the presence of sulfate ions after acidifying and adding barium chloride?

What result would you expect if an aqueous solution containing sulfate ions is treated with barium chloride without prior acidification?

Which precipitate and test result indicate the presence of calcium ions when sodium hydroxide is added to an aqueous sample?

Why are samples often acidified before testing for halide ions with silver nitrate?

A student acidifies a solution and adds silver nitrate: a cream precipitate forms which darkens on exposure to light. Which halide is present?

Which reagent and result identify sulfate ions in an aqueous sample after acidifying with hydrochloric acid?

Which instrumental technique would give a spectrum with sharp emission lines that can be matched to known elements for identification of metal ions in solution?

Which ion is identified by the formation of a white precipitate with barium chloride after acidifying the sample?