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Big Idea 8 - Acid and Base Reaction Systems Learning Goals
Big Idea 8 - Acid and Base Reaction Systems Learning Goals
To identify and classify acids and bases based on type and strength
To relate pH levels to hydrogen molarity in a reaction
To use titrations to determine unknowns in acid-base reactions
To analyze a reaction based on net ionics
A/B Ref Page Answers.pdfUnit Reference Sheets
These are the reference sheets used throughout the acid-base reaction unit.
A/B Ref Page.pdfpH Scales
pH Scales
We start our discussion of acids and bases with the pH scale. This scale is probably the most familiar part of acids and bases to most people. Unfortunately, pH is typically taught by substance as opposed to what it actually means - a measure of hydrogen ion concentration (molarity). The scales shown display pH by substance, but also by hydrogen ion concentration (molarity).
The pH scale is a logarithmic scale. When calculating pH, a calculator with a "LOG" key is required.
pH Practice Problems
These are practice problems involving converting [H+] molarity to pH and pH to [H+] molarity.
pH Problems.pdfpH Problems Answers.pdf
Initial Reflection Lab - Natural pH Indicators
Initial Reflection Lab - Natural pH Indicators
Plants that are sensitive to pH levels typically contain pH sensitive anthocyanin pigments. These pigments can be easily extracted with boiling water, and used to generate pH test spectrums.
Initial Lab and Reflection Procedure and Reflection Questions
This is the procedure for the initial lab. The lab pictures and reflection questions can be recorded by making your own copy of the document to the far right.
Anthocyanins not only play a role in plant coloring, but also in human health. These are the phytochemicals that make fruits and vegetables an important part of the human diet.
The article shown is a research article explaining the connection among plant chemicals, pH, and human health.
Definitions of Acids and Bases
There are three different levels of acid-base definitions. If students have heard a definition before, it's typically the Arrhenian definition - "acids produce H+ while bases produce OH-". In our chemistry course, we are concerned with the Bronsted-Lowry definition. This allows us to use more substances as acids and bases.
Concentration vs Strength Terms
"Concentrated" - more acid molecules present in solution
"Dilute" - less acid molecules present in solution
"Strong" - more acid molecules dissociate so there are more H+ ions present in solution
"Weak" - fewer acid molecules dissociate in solution, so there are fewer H+ ions present in solution
Bronsted-Lowry Reactions
Bronsted-Lowry reactions "follow the bouncing H+". For each reaction, we want to (1) track the hydrogen's path, and (2) identify the acid and base on each side of the reaction.
Bronsted-Lowry Example Problems and Answers
(The answer sheet is an older version of the blank sheet.)
BLReactions.docxB-LReactionAnswers(old version).pdf
Skeptical Topics In Science
Skeptical Topics In Science
The skeptical topic for this unit involves "acidic vs alkaline diets". The articles associated with this topic are listed below. Be sure to read BOTH articles:
This is where 80% Quiz #1 occurs in Unit 8. This quiz covers...
This is where 80% Quiz #1 occurs in Unit 8. This quiz covers...
- Acid and Base Definitions
- The Four Words Used To Describe Acids and Bases
- The pH Scale
- pH Calculations
- Bronsted-Lowry Reactions
Titrations
"Titration" is the process of using a known acid or base to determine the concentration of an unknown acid or base. This is accomplished in a neutralization reaction environment.
Titration Math.docxTitrationMathAnswers.pdfTitration Curves
Titration curve graphs are often used to show differences in titrations. Graphs will vary based on:
Whether the acid is added to the base or the base is added to the acid
Whether the acid and base are STRONG or WEAK
MSDS Safety Documents
HCl MSDS.pdfvinegar MSDS.pdfNaOH MSDS.pdf
Titration Uses
Titration is used to fine tune taste in bottled wines. It is also used in the refining process for biodiesel.
Net Ionic Reactions
Net ionic reactions answer the question "What REALLY happened in a reaction?" Often, the products written in a complete chemical reaction are not the products that actually form or occur - they are merely predictions. Net ionic rules allow us to sort out what forms and what doesn't form in a reaction.
The rules to net ionic reactions are on the back of the Acid-Base reference sheet.
Net Ionics 2022.docxNet Ionics 2022 Answers.pdfThis is a great set of tutorial videos on converting a full ionic reaction equation to a net ionic reaction equation.
By the way...if you wonder why we didn't discuss this sooner in chemistry, it's because some the net ionic rules involve acids and bases. We need to have a firm knowledge base of strong and weak acids and bases in order to use part of the net ionic rule set.
Human Blood pH and Acid-Base Reactions
The human body operates based on numerous complex chemical reactions and cycles. One of these reactions is the process that regulates the pH levels for human blood. This process is an equilibrium situation involving multiple body systems and chemical compounds.
Learning To Learn (L2L)" and Retrieval Assignment List (REQUIRED BEFORE UNIT GRADED TEST) and Calibration Test
Learning To Learn (L2L)" and Retrieval Assignment List (REQUIRED BEFORE UNIT GRADED TEST) and Calibration Test
Learning to Learn and Retrieval List
Intro Lab and Reflection (Natural Indicator Lab)
Practice - Show 3 of the following --> (pH Calculations, B-L Reactions, Acid-Alkaline Diet Analysis, Titration Math, Net Ionics)
80% Quiz #1
80% Quiz #2
RED-YELLOW-GREEN Light Categories
disinfection-team-chlorine-ph-factsheet.pdfThis is the information required for the skeptical question portion of the calibration test.
Acid-Base Calibration Test Answers.pdfCalibration Answers
Calibration Answers
The answers are in an older format, but they are still all there.
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