Pre-Lab Assignment Answer these questions before you come to lab. 1. A sample wa

Question

Pre-Lab Assignment Answer these questions before you come to lab. 1. A sample was prepared by mixing 18.0 mL of 5.00 × i0" M crystal violet (CV) with OH 2.00 mL of 0.333 M NaOH. Calculate the resulting concentrations of CV and of Suppose that Trial I in this lab was run using 0.10 M NaOH, producing a linear kinetics graph with best-fit equation y - 0.00400 x 0.333. If Trial II was run using 0.20 M NaOH, what would the slope of the same graph be if the reaction were (a) zero order, (b) first order, or (c) second order? 2. 3. The rate of the reaction Y + Z YZ is studied much like the reaction irn this lab, except that both Y and Z ab- sorb visible light; thus, their concentra- tions can both be measured directly in a spectrophotometer. In trial 1, |Z] is held constant and [Y] is measured over time, producing the top three graphs. In trial 2, [Y] is held constant and |Z] is mea- sured over time, producing the bottom three graphs. Based on these graphs, write the rate law for this reaction. E Time Time Time L Time Time Time

Explanation / Answer

1. Moles of CV = (5*10^-3/1000) *18 = 9*10^-5 moles

Moles of NaOH = (0.333/1000)*2 = 0.666*10^-3 moles

When they are mixed, the volume becomes 18+2 = 20mL

Concentration of CV = 9*10^-5/20*10^-3= 0.0045 M

Concentration of NaOH = 0.666*10^-3/20*10^-3 = 0.0333 M

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