Full set of Notes with Fill-Ins - San Jose State University

Chem 155 Unit 1 Page 36 of 3166. You need to make a primary stock solution,the concentration of which you know accuratelyand precisely. This solution will usually bemore than twice as concentrated as your mostconcentrated calibration standard. You willdilute this primary stock solution to make thecalibration standards. You need to have enoughto make all of your calibration standards.7. You need to choose the pipets and volumetricflasks that you will use to perform the dilutions.This means that you plan the preparation ofeach standard. This takes some planning andcompromising and many choices – there aremany ways to do this correctly – there is morethan one right answer!8. Decide on and record a labeling system inyour notebook, collect the glassware, and dothe work. I have a labeling system for yourcaffeine, benzoic acid, iron and zinc standards –I need you to use these labels so that we cansort things out in the class.Page 36 of 316