1 / 16

Concentration & Solutions – Part 2

Concentration & Solutions – Part 2. How do we talk about them?. Parts per million (ppm). (%) Per cent: out of a hundred Per million: out of a million. 1 million parts (pieces of pie) 1 part contaminated = 1 ppm 1 part contaminated + 999,999 normal parts. 8 parts (pieces of pie)

maia-benjamin
Download Presentation

Concentration & Solutions – Part 2

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Concentration & Solutions – Part 2 How do we talk about them?

  2. Parts per million (ppm) • (%) Per cent: out of a hundred • Per million: out of a million • 1 million parts(pieces of pie) • 1 part contaminated= 1 ppm • 1 part contaminated + 999,999 normal parts • 8 parts (pieces of pie) • 1 part contaminated= 1 part per 8

  3. What does 1 ppm look like? • 1 drop of water in 50 L • ~30 seconds in a year • 1 penny in $10 000

  4. Real-life examples • 1 ppm of chlorine in a pool to kill bacteria • 4 ppm of oxygen needed for fish in ocean water • 0.01 ppm of arsenic allowed in tap water • 0.05 ppm insecticide (chlorpyrifos) allowed in bananas What are the “parts”?

  5. ppm in mass • 1 ppm of chlorine in a pool • 1 mg in 1 kg of pool water • 60 ppm of contaminant in soil • 60 mg in 1 kg of soil • We can smell H2S at 0.1 ppm concentration in air • 0.1 mg in 1 kg of air = = = 1 ppm 1 g 1 000 000 g 1 mg 1 000 g 1 mg solute 1 kg solution

  6. 1. Solution A has a concentration of 0.65 mg/kg and Solution B has a concentration of 0.225 g/kg. What are their concentrations in ppm?

  7. 2. An 800 g sample of soil from a yard contains 5.3 g of pollutant. What is the concentration of pollutant in ppm?

  8. 3. Another 650 g sample of soil has a pollutant concentration of 7 ppm. How much pollutant is in the soil sample?

  9. 4. Whole wheat bread has 850 ppm of magnesium. How much magnesium is in 1 slice of bread, if one slice has a mass of 30 g?

  10. ppm for aqueous solutions • # parts of solute in 1 million parts of solution 1 mg solute 1 L solution (water) 1 g 1 000 000 mL 1 mg 1 L 1 g 1 000 L ** Solution often substituted for water 1 ppm = = = =

  11. ppm for aqueous solutions • # parts of solute in 1 million parts of solution 1 mg solute 1 L solution (water) = 1 ppm • 4 ppm of oxygen needed for fish in ocean water • 4 g oxygen in 1 L of ocean water • 0.01 ppm of arsenic allowed in tap water • 0.01 g of arsenic in 1 L of tap water

  12. 1. The Gatorade “Thirst Quencher” has approximately 51 mg/L of potassium. What is the concentration of potassium in ppm?

  13. 2. A solution has a concentration of 1.25 g/L. What is its concentration in ppm?

  14. 3. A solution has a concentration of 0.5 mg/mL. What is its concentration in ppm?

  15. 4. Water in a lake is contaminated. A 50 mL sample has 4.8 mg of contaminant. What is the concentration in ppm?

  16. Steps to follow to answer ppm questions mg L mg kg • Write out what values the question gives you • Write out the ppm equation • Ensure the values are in the correct units and convert if necessary • Put the values into the equation • Solve the equation • Answer the question in a sentence ppm = ppm =

More Related