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Introduction to Molarity

Last updated

Feb 22, 2023
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- Hydrogen Whistle
- Le Chatelier's Principle - NO₂/N₂O₄ Equilibrium

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Chemical Concept Demonstrated

Molarity of aqueous solutions

Demonstration

Combine 100 mL of 0.1M Pb(NO₃)₂ and 100 mL of either 0.1M KI or K₂Cr₂O₇.
Propose a balanced chemical equation for this reaction, and predict how much product is produced.

Observations

After the two solutions are mixed, a precipitate forms within the beaker.

Explanations (including important chemical equations)

Pb(NO₃)₂ + 2 KI --> PbI₂ + 2 KNO₃

Pb(NO₃)₂ + K₂Cr₂O₇ --> PbCr₂O₇ + 2 KNO₃

Weighing the two solutions is not a useful approach to finding the amount of product formed. When working with solutions, it is necessary to know the molarity of the solution rather than its weight. Molarity, by definition, is the measure of the number of moles of solute in each liter of solution. By knowing the volumes of the solutions used, it is then possible to calculate the moles of reactants in the solution. The moles of reactants can then be used to predict the amount of product formed.

Contributors

Dr. George Bodner (Perdue University)

Chemical Concept Demonstrated

Demonstration

Observations

Explanations (including important chemical equations)

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