P2 IONS

• What should you be able to do by the end of the video?

  Describe how to use chemical tests
• What is the focus of the required practical mentioned?

  Carrying out chemical tests for ions
• What types of ions are tested in the practical?

  Metal ions and non-metal ions
• What tests are used for metal ions?

  Flame tests and sodium hydroxide solution
• Which non-metal ions are tested for?

  Carbonate, halide, and sulfate ions
• What does a lilac flame test indicate about compound A?

  It contains a potassium ion
• What does a yellow precipitate with silver nitrate indicate about compound A?

  It contains the iodide ion
• What is compound A identified as?

  Potassium iodide
• What does an orange-red flame test indicate about compound B?

  It contains the calcium ion
• What does effervescence with hydrochloric acid indicate about compound B?

  It contains the carbonate ion
• What does the gas produced turning lime water cloudy indicate?

  Carbon dioxide is present
• What is compound B identified as?

  Calcium carbonate
• What does a blue precipitate with sodium hydroxide indicate about compound C?

  It contains the copper(II) ion
• What does a white precipitate with barium chloride and hydrochloric acid indicate about compound C?

  It contains the sulfate ion
• What is compound C identified as?

  Copper(II) sulfate
• What is the best way to learn the tests for metal and non-metal ions?

  • Write flashcards
  • Practice until memorized
  • Review regularly
• What resources are available for practicing questions on testing for ions?

  • Revision workbook
  • Online practice questions
  • Previous exam papers