water definitions

Question 1

hard water

Answer 1

hard water is water that doesn’t form a lather easily with soap

Question 2

BOD (biochemical oxygen demand)

Answer 2

BOD is the amount of oxygen used up by biological means when a sample of water is kept in the dark for 5 days at 20 degrees

Question 3

eutrophication

Answer 3

eutrophication is the enrichment of water with nitrates and phosphates which leads to excessive growth of algae (algae bloom)

Question 4

colorimetry

Answer 4

colorimetry is the technique used to test for chlorine in water