Q2: Week 1 – 11/15 – 11/19
Jump to: Tuesday, Wednesday, Thursday, Friday
11/15 – Monday – A Day – 2/3a Lab, 4
a) To Review Lab conclusions.
b) To review the concepts of Test 2 that tie into Acid/Base.
c) To View a pH Titration curve and determine the unknown concentration, equivalence point, half equivalence point, and the final concentration of the titrant.
Period 2/3:
1. Hand back Labs for review of conclusion writing.
2. Review of Test 2.
3. Pre- titration worksheet review and provide the Lab set-up that represents each problem. The idea is to connect these stoichiometry problems to the lab procedure.
4. Continue to mark up the The Strong Acid and Base Titration pH curve to verify the:
a) Initial pH of the solution
b) half equivalence Point ——–> initial concentration (M) of analyte (acid in this case)
c) Equivalence point —-> pH at equivalence.
d) end point
e) final pH of the solution
Period 4:
1. Complete #3 from above.
Lab 10 Preview – Strong Acid/Base Titration:
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11/15 – Monday Homework: –
2. From the Titration curve of this Volumetric Titration please complete the following on the Graph:
Weak Acid (Acetic Acid – 25ml) Strong Base (NaOH = 0.12M).pdf
View Download
1: Lab 11 Preview – Weak Acid/Strong Base Titration:
25.0 ml of an unknown concentration of Acetic Acid is titrated with 0.12M NaOH. 3 drops of Phenolphthalein was added before the titration began.
End of Monday..
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11/16 – Tuesday – B Day – 2, 3b/4 Lab
a) To identify the equivalence and half equivalence points on a pH titration curve.
b) To estimate the equivalence pH and half equivalence pH along with calculating the final pH of the titration.
c) To calculate the initial concentration of the analyte.
Period 2:
Period 3/4:
2. Review of Test 2. ( I did not get to do this today. I will find time another day)
3. Pre- titration worksheet review and provide the Lab set-up that represents each problem. The idea is to connect these stoichiometry problems to the lab procedure.
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– Lab 10 – Strong Acid / Strong Base Titration
Lab 10 Review of Strong Acid/Strong Base Titration:
This review the virtual lab titration. I review all the steps and requirements for this. I am using the graph generated by the Strong Acid / Strong Base Titration in the virtual Lab below this review video. What I go over is in this video is the same concepts but different data from what you did in Lab today.
I am using the following titration graph that was part of Friday’s Homework:
Strong Base(0.12M) Strong Acid (25.0 ml) Titration.pdf
View Download
End of Monday..
Lab 10 Virtual Lab used in Review video above- Strong Acid/Base Titration:
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11/16 – Tuesday Homework: –
1. Please complete Lab 10 using the Lab 10 Review video that reviews all the steps to your lab. Please write on your lab and number each objective . The requirements are posted above. WE HAVE DONE THIS ONCE BEFORE (FRIDAY”s HOMEWORK!)
End of Tuesday..
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11/17 – Wednesday – A Day – 2/3a Lab, 4
a) To Review the concepts of a strong acid strong base titration.
I am absent today. I will provide a link to a zoom meeting to review the lab and the form. Sorry for the confusion for question 7 and 8. Stay tuned.
Mr. Grodski is inviting you to a scheduled Zoom meeting.
Topic: AP Chemistry 11.17
Time: Nov 17, 2021 08:15 AM Eastern Time (US and Canada)
Join Zoom Meeting
https://us02web.zoom.us/j/82994106657?pwd=Qzg0VEd2S1MvUGxHTzREY0tjOGhYQT09
Meeting ID: 829 9410 6657
Passcode: Ht2ZBP
One tap mobile
+16465588656,,82994106657#,,,,*679927# US (New York)
Period 2/3:
1: I will review the Lab and the form last night by using the Forms Titration Curve which is based on
2. Lets review Monday’s weak acid Strong Base titration homework.
Weak Acid (Acetic Acid – 25ml) Strong Base (NaOH = 0.12M).pdf
View Download
Period 4: –
Same as above.
Side by side comparison of the two type of titrations:
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11/17 – Wednesday Homework: –
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11/18 – Thursday – B Day – 2, 3b/4 Lab
a) To perform a weak acid / weak base titration. b) To identify the equivalence pH to be above 7. c) To identify the effects of the active conjugate base in this type of titration.
Period 2:
Period 3/4:
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– Lab 1 1 – Weak Acid / Strong Base Titration
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11/18 – Thursday Homework: –
1. Please complete objectives 1 – 5, 7 & 8 ONLY of Lab 11 using the Lab 11 Review video that reviews all the steps to your lab. Please write on your lab and number each objective . The requirements are posted above.
SKIP objective number 9 and 6!
Lab 11 Preview – Weak Acid/Base Titration:
End Of Thursday!
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11/19 – Friday – A Day – 2/3a Lab, 4
a) To derive the Henderson – Hasselbach Equation
b) To identify the buffer region in a titration curve
c) To Calculate the Ka of a weak acid through a titration curve and approximate Point 3.
d) To introduce the concept of pKa and how it is used with Acid/base Indicators.
Period 2/3: –
1. We will use the Lab 11 to identify the buffer region of the Titration curve and Derive the Henderson – Hasselbach equation.
2. We will use Lab 11 to determine and calculate the Ka of the weak acid in the titration (acetic acid).
3. Approximate point three of the titration curve.
4. Compare and contrast both titrations in Lab 11 and 12 and collect both labs.
Period 4: –
1. Same as above
2. Collect both Lab 10 and Lab 11.
Today’s Notes:
Table M ![]() |
Do not forget that these indicators are themselves conjugate acid base pairs in equilibrium. In the case of Thymol blue ![]() |

Notice in the first Titration which you should recognize as a strong acid / strong base titration, with a pH of the equivalence pH of 7, can utilize both Thymol blue and Methyl red as indicators as the endpoints will be on the asymptotic line. They would have endpoints with approximately the same volume as the equivalence point.

Using this relationship we know that when we have equal amounts of conjugate Base (A–) and conjugate acid (HA) the log [A–] / [HA] will go to zero because the log of 1 = 0 !!
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So once we establish the equivalence point which is in the middle of the asymptote we attain the volume at that point which in the example to the left is 20 ml. Now we take the equivalence volume and halve it: 20 ml / 2 = 10 ml 10 ml represents the volume of titrant (base) added to neutralize half of the acid. This point is where half of the weak acid has been converted to the conjugate base. So if we had 1 mole of weak acid, .5 moles of the weak acid remains and .5 moles of conjugate base has been created. This is the point where the acid = conjugate base ! pH of this point = pKA |

Henderson – Hasselbach Equation intro!!!!:
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11/19 – Friday Homework: – Make sure you refresh this page to make sure you have the current version!!!!
View Download
1. Acid Base Lab Titration Graph Questions:
End of Week 1!