Flashcards in this deck (34)

• What is the focus of today's qualitative analysis lesson?

  Cations
  chemistry qualitative_analysis
• What are cations?

  Positively charged ions
  chemistry ions
• What is the cation for Calcium?

  Ca²⁺
  chemistry cations
• What is the cation for Magnesium?

  Mg²⁺
  chemistry cations
• What is the cation for Aluminium?

  Al³⁺
  chemistry cations
• What reagents can be used to determine the presence of cations?

  Sodium hydroxide and ammonia
  chemistry reagents
• What is the role of sodium hydroxide in cation analysis?

  It reacts with the cation to produce a color change
  chemistry cations reagents
• What are some examples of cations mentioned?

  Calcium 2+, Copper 2+, Zinc 2+, Aluminium 3+, Lead 2+, Ammonium (NH₄⁺)
  chemistry cations
• What does a blue color indicate in cation analysis?

  Presence of Copper
  chemistry color_analysis
• What does a brownish color indicate in cation analysis?

  Presence of Iron 3
  chemistry color_analysis
• What does a green color indicate in cation analysis?

  Presence of Iron 2
  chemistry color_analysis
• In qualitative analysis, we will focus on cations.
  chemistry qualitative_analysis
• Cations are positively charged ions.
  chemistry ions
• The cation for Calcium is Ca²⁺.
  chemistry cations
• The cation for Magnesium is Mg²⁺.
  chemistry cations
• The cation for Aluminium is Al³⁺.
  chemistry cations
• To determine the presence of cations, we use sodium hydroxide and ammonia.
  chemistry reagents
• Sodium hydroxide reacts with the cation to produce a color change.
  chemistry cations reagents
• Examples of cations include: Calcium 2+, Copper 2+, Zinc 2+, Aluminium 3+, Lead 2+, and Ammonium (NH₄⁺).
  chemistry cations
• A blue color in cation analysis indicates the presence of Copper.
  chemistry color_analysis
• A brownish color in cation analysis indicates the presence of Iron 3.
  chemistry color_analysis
• A green color in cation analysis indicates the presence of Iron 2.
  chemistry color_analysis
• What color indicates the presence of Copper in cation analysis?

  Colorless

  Brownish

  Green

  Blue
  chemistry color_analysis
• Which reagent is used to determine cations?

  Hydrochloric acid

  Nitric acid

  Sodium hydroxide

  Potassium hydroxide
  chemistry reagents
• What are the possible metals mentioned that could be white?

  • Zinc
  • Lead
  • Aluminum
  chemistry metals
• What can sodium hydroxide help identify?

  It can help identify whether the metal is zinc or aluminum based on the reaction.
  chemistry sodium_hydroxide
• What are the three columns written on the whiteboard?

  • Test
  • Observation
  • Inference
  chemistry experiments
• What is the sample referred to in the test for zinc?

  Sample A, which could be zinc chloride (ZnCl₂).
  chemistry zinc samples
• What is added to Sample A during the test?

  A little distilled water.
  chemistry experiments distilled_water
• What is the chemical notation for zinc ions?

  Zn²⁺
  chemistry zinc ions
• What does the instructor know about Sample A?

  The instructor knows that it is zinc chloride or a zinc salt.
  chemistry zinc samples
• In the test, we have the following columns: - Test - Observation - Inference
  chemistry experiments
• Sample A could be zinc chloride (ZnCl₂).
  chemistry zinc samples
• What is the purpose of sodium hydroxide in the test?

  To measure the temperature

  To change the color of the solution

  To identify if the metal is zinc or aluminum.

  To dissolve the metals
  chemistry sodium_hydroxide