1. Transmittance is defined as the fraction of the original light that passes through the sample. T=P/Po where Po is the original and P is after passing through the cell. You will measure T on the instruments. A=log10(Po/P)= -log T or 2.00-log(%T) or abs. If %T = 50 % what is A?

2. Using the CsVs=CdVd where the concentration of a stock solution is 2.45 calculate the concentration of a dilute solution if a volume 20.20 of the stock solution is diluted to 95.08. Give answer to 2 decimal places.