INSTRUCTIONS
To do this presentation (minimum 6 slides, in PowerPoint format), we are providing you with an acid, acetic acid (HC2H3O2) and the base (NaOH), and you will use phenolphthalein as an indicator.
You will create a mock titration experiment and use given hypothetical data (volume of vinegar, Molarity of NaOH and volume of NaOH for three trials) to solve the titration calculations (consult your instructor if you need further clarification). At the end of your presentation (only PPT slides), you will calculate (1) the unknown concentration of the acetic acid (Molarity) and (2) the % mass/vol of the Vinegar solution.
Here is a video that illustrates the titration process and necessary calculations:
Here is the hypothetical experimental data that was obtained after your hypothetical titration. Use the data provided for your calculations:
Your instructor will provide data for steps 1 and 2:
Students must complete Steps 3-10 for their presentation results!
Concentration of NaOH (from the bottle): __0.350 M___
The volume of vinegar used (that you poured in the flask): __9.50 mL____
Step:
Trial 1
Trial 2
Trial 3
(1)
Initial NaOH level in buret
0.00 mL
0.00 mL
0.00 mL
(2)
Final NaOH level in buret
25.10 mL
26.10 mL
25.70 mL
(3)
Volume (mL) of NaOH used
- Your presentation must consist of more than merely a series of bullet points to earn full credit.
- Remember, you want to teach your peers how to do titration experiment and calculations. Your experiment should be reproduced with ease.
- Use the Notes section for each slide to fully explain your answers, if necessary.
- TurnItIn will be used, so paraphrase where necessary to avoid plagiarizing.
- Grading: See rubric for specific grading criteria (in My Grades). You will be graded based on the rubric; therefore, carefully read it before you start creating your assignment. Remember there are 50 points, so your work must show quality and effort.
To include in your PPT presentation:
Part 1
- Title page
- Purpose of a titration, what is titration and why do we perform a titration?
- Include your thoughts on why understanding acid/base titration is important to your future career, and how you will use this concept as you complete your degree (at least 5 sentences with examples). Note: this section should provide insightful discussion).
- Instrumentation - what are the instruments and glassware used when performing a titration.
- Chemicals and Procedures. What chemicals are needed? List and explain the procedures for this experiment.
- Observations and expectations - List the observations and write your expectations. This might include color change and when the equivalence point (endpoint) might be reached.
Part 2
- Calculations and Results. Show all your step-by-step calculations and write your results for the Molarity of the acetic and the % of the acetic acid.
- Your results must include the following step-by-step calculations:
Steps
Description of steps
Students must do
(4)
Average volume of NaOH used (mL)
Provide Calculations
(5)
Average volume of NaOH used (L)
Provide Calculations
(6)
Moles of NaOH used in titration
Provide Calculations
(7)
Moles of HC2H3O2 neutralized by NaOH
Provide Calculations
(8)
Molarity of HC2H3O2
Provide Calculations
(9)
Grams of HC2H3O2
Provide Calculations
(10)
Percent (m/v) of HC2H3O2 in vinegar
Provide Calculations
- HINT: Remember sig figs in calculations to properly express your final answers (molarity and % mass):
- addition/subtraction -> fewest decimals
- multiplication/division -> fewest sig figs
- Reference page (in proper APA format)
- Read chapter 13 and 14 for review solutions and acid-base reactions