Mississippi Science CHE.9.2
The Standard
- CHE.9
- Enrichment: Students will understand the nature and properties of acids, bases, and salt solutions.
Enrichment: Analyze and interpret data to identify differences between strong and weak acids and bases (i.e., dissociation).
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
- Students compare pH and conductivity data for acid and base solutions at the same concentration. They use the data to decide which solutions form more ions in water.
What Mastery Looks Like
- A student can identify the stronger acid or base from data for equal-concentration samples. They explain that strong acids and bases form ions nearly completely in water, while weak ones form ions only partly.
Common Misconceptions
- Students may think strong means concentrated, or that a weak acid forms no ions. They may use pH alone to compare solutions with different concentrations. Some treat high conductivity as proof that a solution is a strong acid or base, even if it is a salt.
How to Assess It
- Exit ticket: At 0.01 M, acids A and B have pH 2 and 3.4; bases C and D have pH 12 and 10.6. Name the stronger acid and base, and explain what the pH values suggest about ion formation.
Lesson moves
Ways to Teach It
With goggles, test teacher-prepared 0.01 M hydrochloric and acetic acid using pH paper and a conductivity meter; record both readings.
Show two equal-concentration acid samples with pH 2 and 3.4; ask which forms more ions and how students know.
Give pairs pH and conductivity cards for equal-concentration acids and bases; have them sort strong and weak samples and defend each match.
Show vinegar and hydrochloric acid cleaner labels; ask why equal-concentration solutions of their acids have different pH readings.
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Printable CHE.9.2 Worksheet
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Related Standards
- 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.9.6
Enrichment: Obtain, evaluate, and communicate information about how buffers stabilize pH in acid-base reactions.
- CHE.9.3
Enrichment: Plan and conduct investigations using the pH scale to classify acid and base solutions.
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