WMOD00300

• Title: Characterization of Silver Iodide-Sodium Iodide Ice Nuclei Using Chemical Kinetic Methodology
• Date: 5/1/1985
• State: CO
• Weather Modification - Doc Type: Report

I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I

29

concentrations are held constant except one. Either the concentration

of the non-constant reaotant or a produot is monitored through time. In

the above example, if reaotant B is held oonstant and the conoentration

of A or Y could be monitored, then eq. 3.1.2 could be expressed as
g!Al = -k'lA]a (3 1 3)
dt . .

JUll = k' [A]a
dt

(3.1.4)

where

k' ,. klB]b

(3.1. 5)

It eq. 3.1.1 represents an elementary reaction, that is, a single

mioroscopic process, then eq. 3.1.3 and 3.1.4 will describe the

mechanism of that process. The total of the exponents, a + b in eq.

3.1.2, determine the order of the reaction. Often, reaction equations

such as eq. 3.1.1 describe an overall, or net, process in which several

intervening steps 00 our . These steps can occur in parallel to each

other or in consecutive order. Also, equilibria can be established

within the prooess in which reverse reaotions can become important to

the overall rate. The rate constants, k' in eqs. 3.1.3 and 3.1.4, would

not be equivalent in a net prooess and may be expressed as k' 1 and k' 2 '
respectively.

In the laboratory, when a net process is being studied, typioally,

the concentration of either a reaotant or a produot is monitored through

time. If the conoentration of Y is to be moDi tored, eq. 3.1.4 must be

solved using the integrated form of eq. 3.1.3. Integration of eq. 3.1.3

yields several solutions, depending on the value of the exponent, a.