Concentration expressions in solution: how to convert mass/volume percentage to mole/L and the opposite.

Abstract

Sometimes in chemical calculations, one must convert concentration expressions to one another. For instance, it might be necessary to express the concentration given in parts per million as molar concentration. In this puzzle-like easy exercise, the analyst has to convert the concentration of a solute from mass/volume percentage to mole/liter concentration and the opposite. To do this, the draggable green pieces should be placed correctly in the conversion expression. These pieces contain different ratios of physicochemical parameters (such as mL, g, mole and so). Start dropping the piece containing the final concentration expression (mole/L or g/100mL) on the left member frame. Then, the three remaining pieces should be placed on frames beyond equal sign in the expression. A correct conversion is obtained when identical parameters are cancelled in both numerator and denominator. In this case, both sides of the expression have the same parameter ratio (i.e. mole/L or g/100mL) Each piece can be laid on P zone before being dragged to the expression.