If a sodium hydroxide solution were added to a solution containing lead(II) ions, sodium ions, nickel(II) ions and potassium ions, which ion(s) would remain in the supernatant?
If HBr were added to a solution containing lead(II) ions, sodium ions, nickel(II) ions and potassium ions, which ions would precipitate?
You have a solution suspected to contain either copper(II) ions, barium ions or iron ions. Which of the following solutions might be added to determine which cation is present?