Question: How to get a Lake Chemistry graph in Maple?

The pH levels of a lake controls the conc. of harmless ammonium ions(NH4+) and toxic ammonia (NH3) in the lake.

For pH levels <8, conc. of ammonium ions are little affected by pH changes, but decline over many orders of magnitude as pH levels increase beyond pH 8.

Toxic ammonia are negligible at low pH , increase over many orders of magnitude as the pH level increases and reach a high plateau at about pH =10 (after which, NH3 are little affected by pH changes).

 

How do I illustrate this graphically?

 

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