Question: aqueous cream is preserved with 1 ww phenoxyethanol calculate the...
Aqueous cream is preserved with 1% w/w phenoxyethanol. Calculate the amount of phenoxyethanol that must be added to the cream formula to produce 100 g of cream with an overall phenoxyethanol concentration of 1% w/w.
Coal Tar solution 3%
Salicylic acid 2%
Aqueous cream to 100%
(wt/ml of coal tar solution = 0.79 g , glycerol = 1.26 g )