Question

Calculate the grams of starch present in 8 drops (about 0.20 mL) of 3.0% (w/v) boiled starch solution. The unit (w/v) denotes a weight/volume percentage.

Answer 1

In 8 drops (0.20 mL) of the solution there is 0.0060 g of starch.

Step-by-step explanation:

A 3.0% (w/v) is a weight/volume percentage that means that there are 3.0 g of solute (starch) per 100 mL of solution. Then, in 0.20 mL of solution:

`0.20mL(solution).(3.0g(starch))/(100mL(solution)) = 0.0060g (starch)`