Required Practical 7: Identifying Ions (T)

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

  How to use chemical tests to identify ions
• What is the focus of the required practical mentioned?

  Carrying out chemical tests for ions
• Which students is this practical required for?

  Triplet chemistry students
• What does the lilac flame test indicate?

  Presence of 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 happens when compound B reacts with hydrochloric acid?

  It effervesces and produces gas
• What does the gas produced from compound B do to lime water?

  Turns it cloudy
• 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 nonmetal ions?

  • Write flashcards
  • Practice until memorized
  • Review regularly
• What can students expect on the exam regarding chemical tests?

  • Questions on testing for metal ions
  • Questions on testing for nonmetal ions