Lab 3a

What were the filters last week supposed to remove?

• CO2

• Particulate Matter

• Water Vapor

• Joy

What are we measuring today?

• Hardness and Alkalinity

• pH

• Heavy Metal Contamination

• Chlorine

How do we measure alkalinity?

• Measure the pH

• Measure the amount of carbonate and hydroxide species

• Measure the amount of HCl of known strength used to bring the pH to a certain level

• Measure the temperature

Which do you think would have more alkalinity?

• Wastewater (lab 1b)

• Drinking water (lab 3a)

How do we measure hardness?

• Measure the pH

• Measure the amount of calcium and magnesium

• Measure the amount of EDTA of a certain strength used to change the indicator color

• Knock on the water and see if it feels solid

What is EDTA?

• Ethylene Dioxytetrachloride Acid

• Ethylenediaminetetraacetic acid

• An engineered molecule used to chelate lots of molecules at one

• A complexing molecule

Which of these chemicals has an SDS (Safety Data Sheet) on Canvas?

• EDTA

• Eriochrome Black T

• Hardness Buffer

• Hydrochloric Acid

Do you have any concerns about the lab today?