itiy Boggtes II ITE TAD S es. Wash hands with soap and water before leaving the
ID: 637670 • Letter: I
Question
itiy Boggtes II ITE TAD S es. Wash hands with soap and water before leaving the lab. Prelab Questions: l. For a certain first-order reaction with the general form aA >products, the rate is 0.32 Ms when the concentration of the reactant is 0.29 M. Write the first order rate law for this reaction. What is the rate constant for this reaction? For the hypothetical reaction aA ? products. Ilie concentration of A was monitored with time Given the following graph of the experimental data, what is the order of the reaction and what is the rate 300 constant for the loss of reactant A with units?250 2. y 2 42+400 Experimental Procedure (Part I) 1. Set the spectrophotometer wavelength to 590 nm 2. Set the spectrophotometer to read absorbance. 3. Before beginning the kinetic measurements, set the blank measurement using a cuvette filled only with distilled water. Remember to wipe off any fingerprints on the ouliidn nf 20 0 100 time (minutes)Explanation / Answer
Ans 1
The given reaction
aA - - - - > Products
Rate law
r = k[A]
Rate r = 0.32 M/s
[A] = 0.29 M
Rate constant k = r/[A]
= (0.32 M/s) / (0.29 M)
= 1.1034 s-1
Ans 2
The plot between concentration [A] vs time (t) gives a straight line for zero order reaction
Order of reaction = 0
Rate law r = k
For the loss of A, rate of consumption of A
rA = - k
For zero order reaction
[A] = - kt + [A]0
Y = mX + C
Slope = m = - k = - 2.42
Rate constant k = 2.42 M/s
Units of k = units of rA = M/s
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