# Reverse Osmosis Membrane Design Calculator

## Water Filtration Treatment and Purification

### Solving for number of ions per molecule.

Note:

R = universal gas constant = 0.082 atm-liter/gmol-kelvin

#### Inputs:

 osmotic pressure (π) pascalatmospherebardyne/centimeter^2foot of waterinch of mercuryinch of waterkilonewton/meter^2millibarmillimeter of mercurynewton/meter^2pound/foot^2pound/inch^2torr
 osmotic pressure coefficient (φC) pascalatmospherebardyne/centimeter^2foot of waterinch of mercuryinch of waterkilonewton/meter^2millibarmillimeter of mercurynewton/meter^2pound/foot^2pound/inch^2torr
 concentration (CS) gmol/liter
 temperature (T) celsiusfahrenheitkelvinrankin

#### Conversions:

 osmotic pressure (π)= 0 = 0atmosphere
 osmotic pressure coefficient (φC)= 0 = 0atmosphere
 concentration (CS)= 0 = 0gmol/liter
 temperature (T)= 0 = 0kelvin

#### Solution:

 number of ions per molecule (N)= HAS NOT BEEN CALCULATED

#### Other Units:

Change Equation
Select to solve for a different unknown
van't Hoff equation
osmotic pressure
 osmotic pressure osmotic pressure coefficient number of ions per molecule concentration temperature

membrane contaminant rejection
 contaminant rejection influent feed concentration effluent permeate concentration

Reference - Books:

1) P. Aarne Vesilind, J. Jeffrey Peirce and Ruth F. Weiner. 1994. Environmental Engineering. Butterworth Heinemann. 3rd ed.

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By Jimmy Raymond

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