determine the solubility of benzoic acid in water and calculate its delta H (chemistry lab)
Answers
Answer:
The solubility of any compound is measured by the amount of material dissolved in a certain amount of solvent. So you can say that something is soluble in the amount of 5 grams per 100 ml. Now benzoic acid is a case where the ph of the water matters. At high pH, the benzoic acid forms a soluble salt so the solubility increases as the pH increases. Conversely, at low pH, benzoic acid doesn’t dissolve as much. So you really have to specify the pH to say just how much dissolves.
The way this can be done is to weigh out the amount of solvent you want to use, say 100 ml or 100 gm (same thing for water) and add a weighed amount of solute. Stir/mix until you think equilibrium is reached, then filter the remaining material off, dry, and weigh. Or evaporate the solvent to dryness and weigh the residue in the evaporating dish.