Q 3,4,5

1. Give practical examples for homogeneous and heterogeneous samples, respectively, and your judgment rationale. 2. Explain the difference between qualitative and quantitative analysis. 3. In the textbook example for chocolate analysis, how were the two analytes in the sample, theobromine and caffeine, identified and quantified? 4. Calculate the molarity of HCl in the concentrated HCl which is 37.2%(w/w)HCl and has a density of 1.188g/cm3. 5. A solution contains 420.1ppmNa+(22.99g/mol). What mass of Na2SO4(142.043g/mol) would need to be dissolved to make 200.0mL of solution at this concentration