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Preparing a 500.ml (0.500L)of a 0.25M
Step 1 Determine the moles of the solute using the molarity equation and the desired volume. M x liters of solution= moles of solute 0.25M x 0.500L= 0.125mol NaCl Step 2 Convert moles to grams moles x molar mass= grams of solute 0.125mol NaCl x 58.43g/mol =7.304g Step 3 Place a sheet of massing paper on a balance and zero the balance. Mass out the calculated mass (7.304g) onto the massing paper. Step 4 Transfer all the solid into the appropriate size volumetric flask (500.mL in this example). Step 5 Add enough water to 1/2 fill the volumetric flask. Swirl the liquid to dissolve all the solid. Step 6 Add more water until you are about an inch from the line on the flask. Step 7 With a dropper, add the remaining water and bring the bottom of the meniscus to the line. Step 8 Label the container with the concentration, date the solution was prepared and your initials. Back to Acid Base Links |
