Thus, a 2 molar solution has 2 moles of a substance in a total final volume of 1 liter. Use the periodic table in a chemistry text or the Handbook of Chemistry and Physics to look up the molecular weights of individual atoms in a compound. The molecular weight or formula weight of a chemical is usually printed somewhere on the label or it is possible to calculate the molecular weight from the formula using a periodic table. 1 B. Stock solutions when the diluting agent adds to the final volume. TC pipettes are rare.
Volume is measured at the bottom of the meniscus.
P1000 requires a larger blue tip. To get the required volume, set the pipette by using the threaded wheels at the top of the pipette and reading the amount in the window, depress the plunger to the first stop, insert the tip in the solution, slowly release the plunger. To transfer the liquid, press the plunger to the first stop, wait 1 sec., depress the plunger to the second stop to expel the last drop. For P10, P20 and P200 pipetters, the red digits on the dial indicate tenths and hundredths of microliters. For P1000 pipetters, the red digits on top indicate milliliters.