🧪 Chemistry Quiz 14: Concentration, Molarity, and Dilution

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🧪 Chemistry · Quiz 014

Turn the qualitative solution concepts of CHEM-013 into quantitative composition and preparation calculations.

Learning goalCalculate molarity, moles, dilution, and solution-preparation quantities using correct volume definitions and units.

  • 5 questions
  • Applied understanding
  • Explanations after finishing
Answered 0/5
FoundationWhich expression defines molarity, M?
Need a small nudge?

Molarity is an amount-of-solute concentration based on the final solution volume.

UnderstandingA solution contains 0.500 mol of glucose in a total solution volume of 2.00 L. What is its molarity?
Need a small nudge?

Divide the amount of solute in moles by the total solution volume in liters.

ApplicationHow many moles of NaCl are present in 250.0 mL of a 0.200 M NaCl solution?
Need a small nudge?

Convert milliliters to liters before using n = MV.

InterpretationA 25.0 mL sample of 2.00 M KNO₃ is diluted with water to a final volume of 250.0 mL. What is the final molarity?
Need a small nudge?

The amount of solute is unchanged by dilution, so relate initial and final concentration-volume products.

ConnectionYou need 250.0 mL of 0.1000 M NaCl(aq). The molar mass of NaCl is 58.44 g/mol. Which preparation is correct?
Need a small nudge?

First calculate required moles, then convert to mass. Finally distinguish final solution volume from the amount of water added.

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