1. Solutions & Solubility Solution Preparation

2. Solution Preparation from a solid  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.  Equipment needed to prepare a standard solution:  Electronic balance  Volumetric flask Solution Preparation

4. Volumetric Flask

5. Example  For an acid-base titration, you need to prepare 250 mL of a 0.50 mol/L sodium hydroxide solution

6. Step 1  Calculate the number of moles of solute needed.

7. Step 2  Calculate the mass of solute needed.

8. Step 3: The Experimental Procedure Preparing a solution from a solid

9. Experimental Procedure  Weigh out the required mass of sodium hydroxide in a clean beaker.  Dissolve the solid in a small amount of distilled water in the volumetric flask  Add distilled water to the flask until the volume mark is reached  Stopper the flask and mix the contents thoroughly by repeatedly inverting the flask.

10. Now you try…  Prepare 100.0mL of 0.300M solution of sodium chloride.