0.000333 g fluorescein (332.32 g/mol) is dissolved in 225 mL solution of ethanol. The density of ethanol is 0.785 g/mL.
What is the concentration of the solution in molarity (M)?
How many ppm?
I already know that the molarity is 4.45E-6. I just need help on trying to find the ppm please.
mass = volume x density for ethanol.
mass = 225 x 0.785 g/mL = 176.6 g EtOH.
ppm = g solute/10^6 g soln
g solute = 0.000333
g soln = 0.000333+176.6 = 176.6
0.000333/176.6 = 1.8 somethingE-6; therefore, this is 0.000333g solute/g soln. Multiply by 10^6 to find g/10^6 g = about 1.8 ppm. You can find a more accurate answer as I've estimated here and there.
Thank you very much!
To find the concentration in parts per million (ppm), you can use the following formula:
ppm = (mass of solute / mass of solution) * 10^6
1. Calculate the mass of the solution by multiplying the density of ethanol by its volume:
mass of solution = density of ethanol * volume of solution
mass of solution = 0.785 g/mL * 225 mL
2. Convert the mass of fluorescein from grams to milligrams:
mass of solute = 0.000333 g * 1000 mg/g
3. Calculate the ppm using the formula:
ppm = (mass of solute / mass of solution) * 10^6
ppm = (0.000333 g / (0.785 g/mL * 225 mL)) * 10^6
Calculating this expression will give you the concentration of the solution in parts per million (ppm).
To find the concentration of the solution in parts per million (ppm), you need to know the mass of the solute (fluorescein) and the mass of the solution. Let's go step by step to find the ppm.
Step 1: Find the mass of the solute.
Given that the mass of fluorescein is 0.000333 g.
Step 2: Find the mass of the solution.
To find the mass of the solution, we need to multiply the density of ethanol (0.785 g/mL) by the volume of the solution (225 mL):
Mass of solution = density × volume
Mass of solution = 0.785 g/mL × 225 mL
Step 3: Calculate ppm.
ppm (parts per million) is calculated as the mass of the solute divided by the mass of the solution, multiplied by 1,000,000:
ppm = (mass of solute / mass of solution) × 1,000,000
Now, let's calculate the ppm:
Mass of solution = 0.785 g/mL × 225 mL = 176.625 g
ppm = (0.000333 g / 176.625 g) × 1,000,000
ppm = 1885.14
Therefore, the concentration of the solution is approximately 1885.14 ppm.