what is the percent by mass of NaHCO3, in a solution containing 20 g NaHCO3 dissolved in 600 mL H20
mass percent = (mass solute/mass soln)*100
%NaHCO3 = [(20g)/(20g + 600g)]*100 = ??
3.22%
chemistry
To find the percent by mass of NaHCO3 in the solution, we need to determine the mass of NaHCO3 and the total mass of the solution.
Step 1: Calculate the mass of NaHCO3:
The given quantity is 20 g NaHCO3.
Step 2: Calculate the total mass of the solution:
The given quantity is 600 mL H2O. However, the density of water is needed to convert mL to grams.
The density of water is approximately 1 g/mL. Therefore, the mass of 600 mL of water is:
600 mL × 1 g/mL = 600 g
Step 3: Determine the percent by mass:
The percent by mass is calculated using the formula:
Percent by mass = (mass of component / total mass of solution) × 100
Percent by mass NaHCO3 = (mass of NaHCO3 / total mass of solution) × 100
Plugging in the values we calculated earlier:
Percent by mass NaHCO3 = (20 g / (20 g + 600 g)) × 100
Percent by mass NaHCO3 = (20 g / 620 g) × 100
Percent by mass NaHCO3 ≈ 3.23%
Therefore, the percent by mass of NaHCO3 in the solution is approximately 3.23%.