Titration Demo, Curves and Calculations
• Objectives– Today I will be able to:
• Identify the acid, base, conjugate acid and conjugate base in a reaction• Calculate the concentration of an unknown acid by using titration• Analyze a titration curve to determine the equivalence point of the titration
• Informal assessment – monitoring student interactions and questions as they complete the practice
• Formal assessment – analyzing student responses to the calculations and the exit ticket
• Common Core Connection– Build Strong Content Knowledge– Reason abstractly and quantitatively– Use appropriate tools strategically– Attend to precision
Lesson Sequence
• Evaluate: Warm-Up• Elaborate: Conjugate Acid/Base Practice• Explain and Explore: Titration Notes/Demo/
Curve Analysis• Elaborate: Titration Calculations• Evaluate: Exit Ticket
Warm-Up
• Human blood has a pH of 7.3. Calculate the [H3O+]
• What is the pH of a NaOH solution that has a [OH] of 0.025 M?
• Have your homework out on your desk
Objectives
• Today I will be able to:– Identify the acid, base, conjugate acid and
conjugate base in a reaction– Calculate the concentration of an unknown acid
by using titration– Analyze a titration curve to determine the
equivalence point of the titration
Homework
• Wear closed toe shoes Tuesday and Wednesday next week– (May 6,7)
• Finish Titration Calculations
Agenda
• Warm-Up• Conjugate Acid/Base Practice• Titration Notes/Demo/ Curve Analysis• Titration Calculations• Exit Ticket
Conjugate Acid/Base Practice
For the following, predict the products and label the acid, base, conjugate acid and conjugate base.
NH3(aq) + H2O(l)
Titration Notes/Demo/Curves
• Titration is a neutralization reaction– Products are salts and water– Salt produced can be slightly acidic, slightly basic
or neutral (Depends on acid strength)
Goal of Titration
• Procedure use to determine the concentration of an unknown acid or base
• Standard solution – solution with the known concentration
• A solution is titrated until the concentration of acid=base
• This is called the Equivalence Point
• If an acids and bases are transparent, how can we determine when the concentrations are equal?– Use phenolpthalein as an indicator
• Turns fuchsia in a basic solution• Stop titrating when the solution turns light pink
– This is called the endpoint
Watch Mr. Klotz’s Titration Demo
In the perfect world….
• Equivalence point = Endpoint• Our endpoint will be a little beyond the
equivalence point since we have to see the color change
What is happening during the titration?
We can analyze a titration curve. Take out the curve you completed
for HW.
Think about this!
Why is there a drastic change in the pH when 1.0 L of NaOH is titrated?
Why does the pH stay constant before and after that point?
What is the equivalence point ?
Now we can calculate the concentration of an unknown acid
Mr. Klotz will walk you through a guided notes outline to complete the titration
calculation. Problems not completed in class will become your homework.
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