The solubility of benzoic acid in water is 6.80 g per 100 ml at 100 degrees C and 0.34 g per 100 ml at 25 degrees C. Calculate the minimum volume of water needed to dissolve 1.00 g of benzoic acid at 100 degrees C.
The solubility of a compound is diferent at diferent temperatures so if they are asking you to calculate a solubility on a determined temperature you only have to take the data they are giving you for that temperature.
So they are asking for the temperature of 100 degrees C. You have to do a relation between those temperatures:
6,80g ------disolve--------100ml
1g ---------------------------- X
X= 1g*100ml/6,80g= 14,71 ml
o you need 14,71ml of water to disolve 1g of benzoic acid.
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