To determine the number of grams of sodium bicarbonate in a solution, we need to use the concentration and volume of the solution.
First, let's convert the concentration of sodium bicarbonate from a percentage to a decimal:
8.4% = 8.4/100 = 0.084
The concentration is expressed as a mass of sodium bicarbonate per volume of solution.
Now, we can calculate the number of grams of sodium bicarbonate in 250 mL of the solution using the following formula:
Grams of sodium bicarbonate = (Concentration in decimal) x Volume in mL
Grams of sodium bicarbonate = 0.084 x 250 mL
Grams of sodium bicarbonate = 21 grams
Therefore, there are 21 grams of sodium bicarbonate in 250 mL of 8.4% sodium bicarbonate solution.