This question is meant to provide practice in significant figures and unit analysis. As an analytical chemist, you will run into many unusual situations where you need to determine the purity of a solid. This usually means using a technique like a titration, spectrophotometry, or otherwise to determine the concentration of the analyte of interest and comparing that to the actual amount weighed out for the analysis (i.e., a weight percent.) Weight percentages are basically on ALL products because it is hard to get something 100% pure! In an analytical lab, it may just be a small percentage of the product as well, such as how much fluoride is in toothpaste. a) In the year 2041, Crest-gate has become the leading seller of tooth protective products, containing 1.9% of NaF (molecular weight (MW = 41.99 g/mol) in every 100. grams of their solid toothpaste. What is the weight percent of fluoride in the toothpaste? b) What is the concentration of NaF in the toothpaste in ppm? c) Now you are ready to confirm the amount of NaF in the toothpaste! If you weighed out 100. grams of toothpaste, exactly how much 97.% CaCl2would you need to react (and form solid CaF2) with the amount of NaF found in the toothpaste?