Solutions Discovery Lab

Recall

Definitions

  • Solute – ______________________________________________________________

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  • Solvent – ______________________________________________________________

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  • Solution – ______________________________________________________________

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 Introduction

 1)      Type of Mixture:

2)      Solutions?

3)      Ratio?

4)      Likely to grab in Beaker A?                                                           Beaker B?

5)      Greater “concentration”?

6)      More “dilute”  “concentration”?

 

 Definitions

  • Concentration – __________________________________________________________

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  • Dilute – ______________________________________________________________

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  • Concentrated – ___________________________________________________________

_____________________________________________________________________.

 

Exploration

 

1)      Two ways to concentrate

 

 

2)      Two ways to dilute

 

Definitions

  • Diluting – ______________________________________________________________

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  • Concentrating – __________________________________________________________

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Calculation

 

In front of you there is a flask that has a solution of 0.250 L of water with 14.61 g of NaCl dissolved in it. 

1) What is the molar concentration of the solution?

 

 

 

 

 

 

 

Application

 

 

1)      If one wanted to make a 2.00 molar solution of baking soda (NaHCO3) in a 0.500 L volumetric flask, how many grams of baking soda would be needed?

 

 

 

 

2)      Make this solution

 

 

*Synthesis (Critical Thinking)

 

Some salts when dissolved in water make the level of the solvent decrease when they are added because of the way the particles interact with each other in solution.  You are making up a 1 molar solution of one of these salts.

If you follow the procedure above, will your solution be more concentrated than, more dilute than, or exactly 1 molar?  Explain why?

 

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