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Solutions & Solubility

Solutions & Solubility. 6.5 Solution Preparation. Review. Standard Solution = a solution for which the precise concentration is known Used in research laboratories and industrial processes Used in chemical analysis and precise control of chemical reactions. Preparing a Solution by Dilution.

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Solutions & Solubility

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  1. Solutions & Solubility 6.5 Solution Preparation

  2. Review • Standard Solution = a solution for which the precise concentration is known • Used in research laboratories and industrial processes • Used in chemical analysis and precise control of chemical reactions

  3. Preparing a Solution by Dilution • Dilution = the process of decreasing the concentration of a solution, usually by adding more solvent • Stock Solution = a solution that is in stock or on the shelf (i.e., available); usually a concentrated solution

  4. Solution Preparation • Equipment needed to prepare a standard solution: • Graduated Pipettes and bulbs • Volumetric flask

  5. Graduated & Volumetric Pipettes and Bulb transfer small quantities of liquid

  6. The Formula • the number of moles (n) does not change when more solvent is added to a solution; only the concentration changes • therefore, ni (initial) = nf (final) • If a solution is diluted from Vi to Vf, the molar concentration of that solution changes according to the following equation: • Vix Ci = Vfx Cf • ** remember: n = C X V **

  7. The Variables Vix Ci = Vfx Cf • Vi = initial volume • Ci = initial concentration • Vf = final volume • Cf = final concentration

  8. Example • How do you prepare 250 mL of a 0.01 mol/L solution from a stock solution of 0.1 mol/L? • The Calculations:

  9. Preparing a Standard Solution by dilution • Video • Classroom Demonstration

  10. Homework • Section 6.5 Questions (pg. 306 – 307): #2 – 5, 8 a & b, 9, 10 • Chapter 6 Review (pg. 309 – 311): #2, 7 – 9, 11– 13, 17a, 18a

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