Purity of a Substance: A chemical element is one that contains only atoms that are identical to each other in their atomic number, i.e., the number of protons. If they have atoms of other elements alongside it, then the substance is said to be impure. Mining operatio...
Why is it important to leave the lid partly open when first heating the crucible and lid? Why should the crucible and lid be heated gently at first? When the sample is first put into the crucible and heated, the direction say to heat gently for the first five ...
Using a 10 mL burette and a 100 mL volumetric flask you will prepare, in the lab, standard solutions of ~ 2, 4, 6, 8, and 10 ppm in Ca^{2+} from the sim100 ppm standard. You will, of course, need to know these concentrations as precisely as possible. Sup What is volumetric t...