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Acids and Bases

Investigation 3 – PostLab

 

 

 

 

 

 

 

ANALYZE IT

Complete the Analysis Questions in your SDR and then discuss them as a class.

Note: Begin your Analysis by creating a graph that compares the pH of the solutions and the total volume of sodium hydroxide (NaOH) that they added to the hydrochloric acid (HCl) solution.

Note: You should use the data from Table A to draw the graph.

 

  • What was the pH of the hydrochloric acid (HCl) solution before any sodium hydroxide (NaOH) was added? Was it in the acidic, neutral, or basic region of the pH scale? 
  • What happened to the pH of the hydrochloric acid (HCl) solution after you added between 10 and 80 ml of sodium hydroxide (NaOH)? Is this in the acidic, neutral, or basic region of the pH scale? 
  • What happened to the pH of the hydrochloric acid (HCl) solution after you added between 80 and 110 ml of sodium hydroxide (NaOH)? Is this in the acidic, neutral, or basic region of the pH scale? 
  • What happened to the pH of the hydrochloric acid (HCl) solution after you added between 110 ml and 130 of sodium hydroxide (NaOH)? Is this in the acidic, neutral, or basic region of the pH scale? 
  • What happened to the pH of the hydrochloric acid (HCl) solution after you added between 130 ml and 160 of sodium hydroxide (NaOH)? Is this in the acidic, neutral, or basic region of the pH scale? 
  • What happened to the concentration of hydrogen ions (H+) ions when the pH increased from 1 to 12? 
  • Look at the graph. What total volume of sodium hydroxide (NaOH) would need to be added to make the solution neutral (pH 7)?
  • Compare the concentration of H+ ions in the acidic, neutral, and basic regions of your graph. Which region has the higher, lower, and intermediate concentrations of H+ ions? 

GET FOCUSED

Complete the Focus Question in your SDR then discuss it as a class. 

  • What happens to the concentration of hydrogen ions (H+) when an acid and a base are reacted? 

 

COMPREHENSION CHECK

The Comprehension Check is designed to summarize the CELL. If time permits, answer each question below.

  • What properties make acids and bases chemically reactive? 
  • What is the relationship between the concentration of H+ ions in a solution and the chemical reactivity of strong and weak acids? 
  • What is the relationship between the concentration of H+ions in a solution and the chemical reactivity of strong and weak bases? 
  • What is the relationship between the pH of a solution and the concentration of hydrogen ions (H+)? 
  • What happens to the concentration of hydrogen ions (H+) when an acid and a base are reacted?