Solutions & Solubility

Solution Preparation

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

Equipment needed to prepare a standard solution: Electronic balance Volumetric flask

Solution Preparation

Volumetric Flask

Example For an acid-base titration, you need

to prepare 250 mL of a 0.50 mol/L sodium hydroxide solution

Step 1 Calculate the number of moles of

solute needed.

Step 2 Calculate the mass of solute needed.

Step 3: The Experimental ProcedurePreparing a solution from a solid

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.

Now you try… Prepare 100.0mL of 0.300M solution of sodium

chloride.