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[mastermech]

I am an equipment designer and the requirement is to fill a basin to a specified volume and specified % w/w concentration of KOH/H2O solution.
The inputs to the basin are H2O (DI water) and bulk KOH solution (usually supplied at a 45% w/w concentration).
The operator will input the basin volume, desired batch % w/w concentraion, and the bulk supply % w/w concentration. I have flow meters in the supply pipes so that I can control the input volumes.

Here are the two equations to calculate violumes that I am going to use:

H2O volume required = Bv x Bsg x (1- Bp/Sp)

Bulk KOH volume = Bv x Bsg x Bp / (Ssg x Sp)

where;
BV = desired basin volume
Bp = desired basin solution %w/w
Sp = bulk KOH %w/w
Bsg = specific gravity of desired basin solution
Ssg = specific gravity of bulk KOH supply

Note: the two specific gravities will be looked up from tables.

I am asking here for another set of eyes to see if these equations are correct - it wasn't easy to derive them as most problems I see solved do not have the final soultion volume pre-determined.

thanks!!

[breizh]

Mastermech,

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Breizh