Mississippi Science CHE.9.6
The Standard
- CHE.9
- Enrichment: Students will understand the nature and properties of acids, bases, and salt solutions.
Enrichment: Obtain, evaluate, and communicate information about how buffers stabilize pH in acid-base reactions.
2026 Mississippi College- and Career-Readiness Standards for Science · Acids and Bases (Enrichment)
Teacher's field guide
What This Standard Means
What Students Need to Do
- Gather information from a diagram and pH readings about what happens when acid or base is added to a buffer. Check a source's claim against the readings, then explain the result in words or a labeled sketch.
What Mastery Looks Like
- Students identify the weak acid that reacts with added base and its partner base that reacts with added acid. They use pH readings to show a smaller change than in water, not zero change.
Common Misconceptions
- Students may think buffers lock pH at 7 or can absorb unlimited acid. Some think a buffer is just a strong base, so they cannot explain what happens when base is added.
How to Assess It
- A site claims buffers keep pH exactly 7. Equal vinegar additions change water from 7.0 to 4.0 and a buffer from 7.0 to 6.8; ask students to correct the claim and explain what reacted with the added acid.
Lesson moves
Ways to Teach It
Put 50 mL of water and pH 7 buffer in separate cups; add five drops of dilute vinegar to each and compare pH strips.
Give pairs a lab data table and a website claim that buffers stop all pH changes; ask them to revise the claim using measurements.
Give pairs H+ and OH− cards plus acetate and acetic acid cards; match each added ion to its reacting buffer partner.
Use a blood pH chart showing 7.40 before exercise and 7.35 after; ask how bicarbonate limits the shift.
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Printable CHE.9.6 Worksheet
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Related Standards
- CHE.9.2
Enrichment: Analyze and interpret data to identify differences between strong and weak acids and bases (i.e., dissociation).
- CHE.9.4
Enrichment: Analyze and evaluate the Arrhenius, Bronsted-Lowry, and Lewis acid-base definitions.
- CHE.9.1
Enrichment: Analyze and interpret data to describe the properties of acids, bases, and salts.
- CHE.9.3
Enrichment: Plan and conduct investigations using the pH scale to classify acid and base solutions.
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