How to make sparkling powder for candy?
I assume you mean sherbet, which is made by mixing 1 cup of powdered sugar (also called icing or confectioner's sugar) with 1 tsp of baking soda (also called bicarbonate of soda) and 1 tsp of powdered citric acid. Altering the proportion of soda (alkali) to citric acid makes it more or less fizzy.