Calculating PPM and Molecular Weight

The video tutorial explains the concept of parts per million (PPM) as a measure of concentration, using a formula involving the mass of a compound and the total mass of a solution. An example problem is presented, where the goal is to determine the amount of HCL needed to create a solution with a specific PPM concentration. The tutorial walks through calculating the molecular weight of water and solving for the required amount of HCL using algebraic manipulation.

What does PPM stand for in chemistry?

• Parts Per Million

• Parts Per Molecule

• Parts Per Minute

• Parts Per Mole

What is the formula for calculating PPM?

• Volume of compound divided by total volume of solution times 10^6

• Volume of solution divided by volume of compound times 10^6

• Mass of solution divided by mass of compound times 10^6

• Mass of compound divided by total mass of solution times 10^6

How do you calculate the molecular weight of water?

• Add the atomic weight of hydrogen and oxygen

• Multiply the atomic weight of hydrogen by 2 and add to oxygen

• Add the atomic weight of oxygen and multiply by hydrogen

• Subtract the atomic weight of hydrogen from oxygen

What is the molecular weight of water?

• 22 g/mol

• 18 g/mol

• 20 g/mol

• 16 g/mol

How many grams of water are there in the initial solution?

• 475 g

• 450 g

• 425 g

• 400 g

What is the purpose of using the PPM formula in this example?

• To find the volume of HCL needed

• To find the concentration of water

• To find the amount of HCL needed in grams

• To find the temperature of the solution

What is the total mass of the solution when calculating PPM?

• The difference between the mass of water and HCL

• The sum of the mass of water and HCL

• Only the mass of HCL

• Only the mass of water

What is the final concentration of HCL in parts per million?

• 95,000 ppm

• 90,000 ppm

• 85,000 ppm

• 80,000 ppm

How many grams of HCL are needed to achieve the desired concentration?

• 45.51 g

• 44.51 g

• 47.51 g

• 46.51 g

What is the total mass of the solution after adding HCL?

• 500 g

• 494.51 g

• 450 g

• 544.51 g