This is the boss. No calculator — the molar mass is a friendly 40 g/mol, the concentrations land on 0.1, 0.5, 1 and 2 mol/L, and every draw fits in your head. One order, one chain, and every answer feeds the next: weigh the pellets, count the moles, label the stock, pour the dilution, top up with water. Write each line down — one early slip flows all the way to the wash bottle.

Everything from the chapter rides in it. 5★ under par here is the chapter crown. Apron on.