Remove the pipette from the stock solution. Place the rinsed pipette into the stock solution in the conical flask and draw up the solution until it is past the level marked on the pipette. Use the pipette filler (bulb) to draw up a small amount of stock solution from the conical flask, remove the pipette from the solution, swirl the solution in the pipette around to rinse it and then discard this solution suitably.ĭO NOT use water or any other solvent to rinse the pipette because you would be diluting the solution and we would no longer know what the concentration of this solution is. This will be printed on the pipette, for example 10.00 mL, 25.00 mL, etc You will need a clean, dry, pipette with a known volume. Record the concentration of this undiluted stock solution as c 1 in mol L -1 Label it with the date, and the formula of the solution and its concentration, for example = 0.10 mol L -1 Stopper the conical flask when you are not using it to prevent contamination from the atmosphere. Pour some of your stock solution into the rinsed conical flask. In order to prevent contamination of this stock solution, place a small amount of it in a clean, dry, conical flask (erlenmeyer flask), swirl it around and then discard this solution appropriately.ĭO NOT use water or any other solvent to rinse the flask because adding more solvent would dilute the solution and we would no longer know what the concentration of this solution is. This solution is referred to as the stock solution. The solution to be diluted will be in a vessel such as a volumetric flask. A way of adding the pure solvent to the volumetric flask, for example a glass funnel and a pasteur pipette.A container of pure solvent, the same solvent used to make the original solution, such as water.A pipette to remove a known volume of this solution from the container and transfer it to a new container such as a volumetric flask.This is the stock solution, the solution to be diluted. A container of solution of known concentration.
#HOW MANY SIG FIGS IN 250 ML VOLUMETRIX FLASK FREE#
No ads = no money for us = no free stuff for you! Dilution Techniqueĭilution means to reduce the concentration of a solution.Ī solution can be diluted by adding solvent to a given volume of stock solution. Determine concentration of dilute solutionĭetermine concentration of stock solution
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