Example 4 Reaction 1

[njmbell]

Hello,

In Example 4, reaction 1 has an input of:

H20      -1.0
52.73 moles

The example describes why we are removing 52.73 moles to concentrate the solution by 20-fold. But why are inputs on both lines added? I do not understand why it is not just either:

H20   -1.0

or

H20     -52.73 moles

What is the point of adding both of them?

Thank you!

[dlparkhurst]

A couple reasons.

(1) You can have multiple reactants in REACTION, so the first entry allows you to define the ratio of reactants simply, and the second entry can provide the total number of moles added:

Code: [Select]

REACTION
NaCl 1
KCl  0.1
0.001 moles

(2) You can define multiple steps in the second entry:

Code: [Select]

REACTION
...
0.001 in 10 steps

or the following removes a total of 55.1 moles of water:

Code: [Select]

INCREMENTAL_REACTIONS true
REACTION
H2O -1
50 5*1 0.1