Create a PowerPoint presentation that shows the process of going through an acid/base titration like you would if you were in a physical lab.
This Signature Assignment aims to show that you can compute properties of solutions and analyze and interpret data. You will create a PowerPoint presentation that shows the process of going through an acid/base titration like you would if you were in a physical lab. Your lab assignment presentation involves putting together a PowerPoint presentation to show other students how to perform titration. In other words, your presentation can be used to show other students (next term) how they can perform a titration by following your instructions and calculations.
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!
The concentration of NaOH (from the bottle): __0.150 M___
The volume of vinegar used (that you poured in the flask): __7.50 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
35.25 mL
35.50 mL
35.17 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
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)
I posted the calculation guide in the files
DO NOT make a PowerPoint –> make an outline of each slide and what should be put on it.
Requirements: an outline for 6+ powerpoint pages
Calculations for Week 8 Signature Assignment
Molarity (M) of Acetic Acid:
Calculate the volume of NaOH solution used to neutralize the vinegar sample for your Trial 1, 2, and 3:
The volume of NaOH = Final Volume of NaOH (step 2) – the initial volume of NaOH (step 1)
Calculate the average volume of the NaOH solution that was needed for the titration:
Average volume (mL) =
Convert the average volume for NaOH from step 4 to its volume in liters (L):
L = mL NaOH from step 5 x
Calculate the moles of NaOH by using the volume of NaOH in liters from step 5 and the molarity of NaOH given in the instructions. Remember that molarity is interchangeable with concentration.
Moles of NaOH = L of NaOH x
The number of moles of HC2H3O2 in vinegar is equal to the moles of NaOH used in the titration. Convert the moles of NaOH from step 6 to the moles of acetic acid in the vinegar. Use neutralization chemical reaction and stoichiometry to explain why they are equal.
moles of HC2H3O2 = moles of NaOH
Calculate the molarity (M) of the acetic acid (HC2H3O2) solution in the vinegar. Check significant figures.
Molarity (M) of HC2H3O2 =
Mass/Volume Percent (m/v) of Acetic Acid:
Calculate the number of grams of acetic acid in the vinegar sample by using moles of acetic acid from step 7 and the molar mass of acetic acid (must calculate on your own for HC2H3O2)
Grams of acetic acid = moles of acetic acid from step 7 x Molar mass of acetic acid
Calculate the percent (mass/volume) of acetic acid in vinegar using grams of acetic acid from step 9 and the volume of vinegar given in the instructions, in mL. Check significant figures.
Mass/volume percent (m/v) = x 100%
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