Mississippi Science CHE.8.5
The Standard
- CHE.8
- Students will demonstrate an understanding of the nature of properties of various types of chemical solutions.
Use mathematical and computational analysis to analyze molarity, molality, dilution, and percentage dilution problems.
2026 Mississippi College- and Career-Readiness Standards for Science · Solutions
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students calculate molarity using liters of solution and molality using kilograms of solvent. They use a calculator or spreadsheet to find a diluted concentration and the percent of stock in the final mixture.
What Mastery Looks Like
- Given a stock concentration and a target volume, students calculate how much stock to use. They show their units and check that the stock volume is less than the final volume. They use solvent mass, not solution volume, when calculating molality.
Common Misconceptions
- Students may use the mass of the whole solution instead of the solvent to find molality. They may use the amount of water added instead of the final volume in a dilution calculation. Some report percent water when asked for percent stock.
How to Assess It
- Exit ticket: Dilute 10 mL of 2.0 M stock to 50 mL total. Calculate final molarity and percent stock by volume, then name the measurement needed to calculate molality.
Lesson moves
Ways to Teach It
Measure 10 mL of dyed water, add water to the 50 mL line, and calculate the stock percentage from the two volumes.
Ask: If 0.2 mol dissolves in 0.5 kg water to make 0.6 L solution, which denominator gives molarity and which gives molality?
In pairs, enter a 2.0 M stock and three volume pairs in a spreadsheet, then compare final molarity and percent stock.
Use a mock 5% by volume cleaner label to calculate the stock and water needed for 100 mL of 1% cleaner.
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Printable CHE.8.5 Worksheet
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Related Standards
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Use mathematical and computational analysis to quantitatively express the concentration of solutions using concepts such as molarity, percent by mass, and dilut...
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Use mathematical and computational analysis to solve density problems. Manipulate the density formula to determine density, volume, or mass or use dimensional a...
- CHE.8.7
Use mathematical and computational analysis to predict the results of reactions using the concentration of solutions (i.e., solution stoichiometry).
- CHE.4.6
Use mathematical and computational analysis to determine the empirical formula and the percent composition of compounds.
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