Acid Base pH

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Acid Base pH is the ultimate tool for accurate estimation of pH values of acid – base aqueous systems. This application calculates pH values of solutions of weak and strong, monoprotic and polyprotic acids and bases and additionally builds titration curves and provides pH and titrant volume values at equivalent points.

Layout of "Acid Base pH". Screen is divided by two sides: acidic (left) and basic (right), comprising of initial data of solutions, such as molar concentration, volume, proticity and optional equilibrium dissociation constants. Title fields allow to choose whether the compound is titrant or analyte and proticity fields allows to choose strength and proticity of acid or base. Important: Titrant compound, by default, can be only monoprotic and strong. When molar concentration of only one initial solution is provided (acid or base side), the application will estimate pH of the single solution. On the other hand, if at least concentrations of both solutions are provided, then application will be able to draw titration plot (“Plot” option in menu), based on initial concentrations and titrant-analyte choice and provide pH and titrant volume values at equivalent points. Furthermore, the plot of titration curve can be exported as an image or as xls worksheet. Additionally, it is possible to find titrant volume needed to achieve desired pH value, by edition of value in pH field and pressing Calculate button.

Application features.

•Estimation of pH values is based on advanced quantitative chemical analysis which allows simultaneous calculation of all dissociation stages of acid and base and water dissociation (Kw).

•Application can plot titration curve and export it as an image or data file to the “Acid Base pH” directory on local sd drive.

•Upon pressing “EP” menu option, application displays semi-transparent info field, listing pH and titrant volume values at equivalent points. This info field can be freely moved on display to the most convenient position.

•Application provides list of widely used indicators and draws schematic colour transitions for chosen indicator directly on the titration plot.

•Application is able to estimate the titrant volume needed to achieve desired pH values (within titration range), that is particularly useful for buffer preparation.

•The dissociation constants fields accept both formats: 1) pK values (-log(K)) and 2) regular K values, but only in a particular scientific format, which requires inclusion of exponential part “e” (for example: 1e-5 instead of 0.00001, or 2.5e0 instead of 2.5). Empty dissociation constant field would imply that this dissociation step is “strong” or complete.

•Long press on final pH field opens window showing corresponding value of pOH and [H+] and [OH-] concentrations.

•Application helps in preparation of buffer solution, since the volume of strong electrolyte (added to a weak electrolyte solution) can be derived from the plateau region of the titration curve.

The preparation of the desired solutions may be further facilitated by using Chemical Solution Wizard app and deprotonation kinetics and equilibrium may be followed by using Chemical Kinetics and Chemical Equilibrium apps. On the other hand, pH values of the compounds having numerous functional groups (carboxylic and amino-derivatives, like amino acids) can be calculated and plotted by means of Isoelectric Point app.