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The equiligraph is a time tested way of solving complex equilibria problems of both pure solutions and mixtures of poly-protic acids and bases.  Full app function is available for these molecules, except for the ability to change pKa or change the number of protons.  Often only one form of a molecule participates in a reaction and the fraction of that form can change significantly with small changes in local pH.  These preprogramed analysis serve as reminders and guides to interpretation of results and ultimately, are a teaching tool for how to get the most value from the app itself.  This is a great way to learn how subtle differences in chemical structure can change chemical reactivity.  Aqueous acid-base equilibria can be studied from multiple perspectives, leading to greater insight and understanding.  These graphs are extremely useful for explaining complex interactions between chemical species ( see ).  This app will help you avoid blind alleys and lost time in the laboratory.  The calculations are based on the full coupled equations, which are supplied in the help section.  A free trial version includes several common molecules.  This is a tool for beginning students and professionals alike.  There really is no better way to understand acid-base equilibrium than to see how composition changes over a broad pH range.  These can be used 'as is' or can be a starting point for exploring other molecules.  This tool provides that global perspective.  This is a unique and informative utility for students and professionals alike.  in Explore mode, the number of acid groups and pKa can be modified at will.  This app has 13 pre-programmed analyses and displays the results both graphically and numerically.  A half an hour with this app could save you an afternoon in the library and could even save you 6 months in the laboratory.  It is a tool you will grow into, but not outgrow.  The answer could literally be in your back pocket! Even for tetra-protic acids such as EDTA.  More than 80 molecules are included.