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Concentration & Molarity

Concentration & Molarity. Concentration. The concentration of a solution is an indication of how much solute there is dissolved into the solvent. High concentration means a high amount of solute dissolved in a solvent

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Concentration & Molarity

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  1. Concentration & Molarity

  2. Concentration • The concentration of a solution is an indication of how much solute there is dissolved into the solvent. • High concentration means a high amount of solute dissolved in a solvent • Low concentration means a low amount of solute dissolved in a solvent

  3. Color & Concentration

  4. Molarity • M is the symbol for molarity • 6 M HCl – said “six molar solution of hydrochloric acid” • Units are mol solute L solution **Solution = solute + solvent

  5. Calculating Molarity What is the molarity of a potassium chloride solution that has a volume of 400.0mL and contains 85.0 g of potassium chloride?

  6. Vinegar contains 5.0g of acetic acid, CH3COOH, in 100.0 mL of solution. Calculate the molarity of this solution.

  7. If your teacher asks you to prepare 1.00 L of a 0.500 M solution of NaCl, how many grams of NaCl would it contain?

  8. Molarity and Stoichiometry • Many times in the lab, chemists are dealing with solutions rather than dry chemicals • So the chemicals are measured out in volumes instead of by mass

  9. What volume in mL of a 0.500 M solution copper II sulfate is needed to react with an excess of aluminum to provide 11.0 g of copper? Bal. eqtn.

  10. Commercial HCl is 12.0 M. Was is the mass of HCl in 250.0 mL of solution?

  11. Other Units of Concentration Molality = m = mol solute kg solvent Parts per million = ppm = g solute 1000000g solution

  12. You will prepare 250 ml of a 0.1 M solution of glucose • Calculate the amount of solute that must be contained in the final solution • Add a small amount of solute to the volumetric flask • Add the solute and dissolve if needed • Add more solute to reach the final volume of the solution • Why can’t we just add glucose to 250ml of water?

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