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Acids and Bases
pH, pOH for Strong Acids/Bases pH for Weak Acid pH for Weak Base
Conjugate Acid/Base pairs Buffers Strong Acid Titration Weak Acid Titration
Half Equivalence Acid/Base Titration
Conjugate Acid/Base pairs Buffers Strong Acid Titration Weak Acid Titration
Half Equivalence Acid/Base Titration
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pH, pOH for Strong Acids/Bases
Watch Khan Academy's, Acid Base Introduction.
1. Color the Acid/Base activity and practice the vocabulary.
2. Give the name and formula for the molecules shown above.
3. Are these molecules acids or bases? Why?
4. Do these molecules satisfy all three definitions of an acid or base? Why (why not) ?
5. Which definition(s) do the acid and base pair below satisfy, Arrhenius, Bronsted-Lowry and/or Lewis?
Assessment
Watch Khan Academy's, Acid Base Introduction.
1. Color the Acid/Base activity and practice the vocabulary.
2. Give the name and formula for the molecules shown above.
3. Are these molecules acids or bases? Why?
4. Do these molecules satisfy all three definitions of an acid or base? Why (why not) ?
5. Which definition(s) do the acid and base pair below satisfy, Arrhenius, Bronsted-Lowry and/or Lewis?
Assessment
Determining Antacid Strength Project
Driving Question: How do we as pharmaceutical testers identify reactions in antacids, conduct titrations and develop a parameter so that we can give pharmacists reliable information and recommendations to help their consumer?
Calendar
Stage 1-Descriptive Acid/Base PPT/Noteguide & A Comprehensive Problem Statement
-Describe general stomach acid/antacid reaction
-General Household Products Lab
-Predict product formulas for all of the chemical reactions occurring with each of three types of antacids.
-Write balanced chemical equations with formulas/symbols for all of the chemical reactions occurring with each of the 3 antacid products.
-Evaluate possible side effects of medication due to products and side reactions, make a chemical table to conclude your research.
-Antacid Quiz & pH Quiz
-Reading for Relevance: Coral Reefs/Ocean Acidity (also EL) Sea Urchins/Ocean Acidity (aslo EL) Oyster Farming/Ocean Acidity (also EL) Political Action/Ocean Acidity (also EL)
Stage 2-Quantitative Game Plan
-Record detailed steps of titration experiments for each of the 3 antacid products.
-pHET simulation
-Titration Lab Part 1: Titrating Vinegar, Titration Video/Noteguide
-Record equipment and chemicals used during of titration experiments for each of the 3 antacid products.
-Titration Lab Part 2: Titrating Antacids
-Record volumes of HCl neutralized during titration experiments for each of the 3 antacid products, warm-up.
-Record concentrations (in M) of HCl neutralized during titration experiments for each of the 3 antacid products.
-Show calculations for moles of antacid reacted. Understanding Check.
-Submit for Peer Review
Stage 3-Analytical Analysis & Reflection
-Compare the predicted amount of neutralized HCl to the actual amount neutralized during lab testing
-Calculate percentage difference/error between predicted and actual amounts of neutralized HCl
-Include a table summarizing the following results/criteria for each of the 3 antacids:
££ Effectiveness* of a single dose
££ Size of single dose
££ Cost of single dose of each of the 3 antacids (regular and generic?)
££ Reaction time and/or rate
££ Side products/effects
Final Rubric
Name the following common acids/bases:
Driving Question: How do we as pharmaceutical testers identify reactions in antacids, conduct titrations and develop a parameter so that we can give pharmacists reliable information and recommendations to help their consumer?
Calendar
Stage 1-Descriptive Acid/Base PPT/Noteguide & A Comprehensive Problem Statement
-Describe general stomach acid/antacid reaction
-General Household Products Lab
-Predict product formulas for all of the chemical reactions occurring with each of three types of antacids.
-Write balanced chemical equations with formulas/symbols for all of the chemical reactions occurring with each of the 3 antacid products.
-Evaluate possible side effects of medication due to products and side reactions, make a chemical table to conclude your research.
-Antacid Quiz & pH Quiz
-Reading for Relevance: Coral Reefs/Ocean Acidity (also EL) Sea Urchins/Ocean Acidity (aslo EL) Oyster Farming/Ocean Acidity (also EL) Political Action/Ocean Acidity (also EL)
Stage 2-Quantitative Game Plan
-Record detailed steps of titration experiments for each of the 3 antacid products.
-pHET simulation
-Titration Lab Part 1: Titrating Vinegar, Titration Video/Noteguide
-Record equipment and chemicals used during of titration experiments for each of the 3 antacid products.
-Titration Lab Part 2: Titrating Antacids
-Record volumes of HCl neutralized during titration experiments for each of the 3 antacid products, warm-up.
-Record concentrations (in M) of HCl neutralized during titration experiments for each of the 3 antacid products.
-Show calculations for moles of antacid reacted. Understanding Check.
-Submit for Peer Review
Stage 3-Analytical Analysis & Reflection
-Compare the predicted amount of neutralized HCl to the actual amount neutralized during lab testing
-Calculate percentage difference/error between predicted and actual amounts of neutralized HCl
-Include a table summarizing the following results/criteria for each of the 3 antacids:
££ Effectiveness* of a single dose
££ Size of single dose
££ Cost of single dose of each of the 3 antacids (regular and generic?)
££ Reaction time and/or rate
££ Side products/effects
Final Rubric
Name the following common acids/bases:
Put them in order as shown above: nitric acid potassium hydroxide, sodium hydroxide, sulfuric acid, hydronium ion, hydroxide, perchloric acid, lithium hydroxide, hydrochloric acid
Calculations
Calculation Part I:
Watch the pH scale Activity at classzone.com for Ch 16
1. Answer the follow-up questions and print your results.
2. List three common acids and bases we use daily: ________ ________ _______ and _______ _______ _______
3. Place these chemicals on a pH scale in order ranging from 0 to 14.
4. Use the following formulas to calculate the hydrogen ion concentrations of these solutions:
pH = -log10[H+] and [H+] = 10^-pH
For example, Find pH given [H+] = 1.4 x 10^-5 M
pH = -log10[H+]
pH = -log10(1.4 x 10^-5)
pH = 4.85
OR
Find [H+] if pH = 8.5
[H+] = 10^-pH
[H+] = 10^-8.5
[H+] = 3.2 x 10^-9 M
Prepare for Classzone.com Quiz 16B
Calculations Part II:
Watch Khan Academy's pH pOH of strong acids and bases.
1. Calculate the pOH of the acids and bases listed above using these additional formulas:
Kw = [H+][OH-] = 1x10^-14 at 25°C
for pure water [H+] = [OH-] = 1x10^-7
and pKw = -log10[H+] + -log10[OH-] = 14
2. Given the pH of lemon juice is 2.33, what is the concentration of OH-?
3. Given the pH of ammonia is 11.71, what is the concentration of OH-?
For example, Find the pH of vinegar is 2.72.
First, find [H+]:
[H+] = 10^-pH
[H+] = 10^-2.7
[H+] = 2.5x 10^-3 M
Second, find [OH-]:
Kw = [H+][OH-] = 1x10^-14 at 25°C
= 2.5x 10^3M * [OH-] = 1x 10^-14
= 1x 10^14M
2.5x 10^3M
= 7.5x 10^12M
Prepare for Classzone.com Quiz 16A
Calculations
Calculation Part I:
Watch the pH scale Activity at classzone.com for Ch 16
1. Answer the follow-up questions and print your results.
2. List three common acids and bases we use daily: ________ ________ _______ and _______ _______ _______
3. Place these chemicals on a pH scale in order ranging from 0 to 14.
4. Use the following formulas to calculate the hydrogen ion concentrations of these solutions:
pH = -log10[H+] and [H+] = 10^-pH
For example, Find pH given [H+] = 1.4 x 10^-5 M
pH = -log10[H+]
pH = -log10(1.4 x 10^-5)
pH = 4.85
OR
Find [H+] if pH = 8.5
[H+] = 10^-pH
[H+] = 10^-8.5
[H+] = 3.2 x 10^-9 M
Prepare for Classzone.com Quiz 16B
Calculations Part II:
Watch Khan Academy's pH pOH of strong acids and bases.
1. Calculate the pOH of the acids and bases listed above using these additional formulas:
Kw = [H+][OH-] = 1x10^-14 at 25°C
for pure water [H+] = [OH-] = 1x10^-7
and pKw = -log10[H+] + -log10[OH-] = 14
2. Given the pH of lemon juice is 2.33, what is the concentration of OH-?
3. Given the pH of ammonia is 11.71, what is the concentration of OH-?
For example, Find the pH of vinegar is 2.72.
First, find [H+]:
[H+] = 10^-pH
[H+] = 10^-2.7
[H+] = 2.5x 10^-3 M
Second, find [OH-]:
Kw = [H+][OH-] = 1x10^-14 at 25°C
= 2.5x 10^3M * [OH-] = 1x 10^-14
= 1x 10^14M
2.5x 10^3M
= 7.5x 10^12M
Prepare for Classzone.com Quiz 16A
pH for Weak Acid
pH for Weak Base
Calculations Part III:
Watch Khan Academy's pH for Weak Acid and Base video.
Use the following formulas:
Ka = [H+][A-]
[HA]
look up Ka @ 25 C
[H+] = x, [A-] = x and [HA] = 1.5-x
so, Ka =(x^2
1. Calculate the pH for acetic acid in a 1.5 M solution.
2. Calculate the pH for ammonia in a 1.5 M solution.
Prepare for Classzone.com 16C
Calculations Part III:
Watch Khan Academy's pH for Weak Acid and Base video.
Use the following formulas:
Ka = [H+][A-]
[HA]
look up Ka @ 25 C
[H+] = x, [A-] = x and [HA] = 1.5-x
so, Ka =(x^2
1. Calculate the pH for acetic acid in a 1.5 M solution.
2. Calculate the pH for ammonia in a 1.5 M solution.
Prepare for Classzone.com 16C