Ozone Fresh
Which of the following are true statements ?
a) Fresh water makes up about twenty five percent of the earth’s surface water.
b) Chlorination is the most common method used to remove harmful bacteria from water. This is done by adding a reagent, such as NaOCl, to water to produce hypochlorus acid.
c) While ozone and ultraviolet radiation are also used as bactericidal methods in water purification, they do not protect against contamination after water leaves the treatment plant.
d) Ca2+ and Mg2+ are both ions that contribute to the “hardness” of water.
e) Fe2+ and Mn2+ can be removed from hard water by the process of aeration, which oxidizes these ions.
f) The ion exchange method that is used to soften water in homes involves a displacement reaction where Ca2+ and other unwanted ions displace Na+ from a polymer that contains SO3− groups.
I thought it was b,c,d, and f… but thats not showing up as the right answer. help please !
I had a really tough time with this question, too… but then I checked Ch 15.11 in the textbook.
a) False, less than 3%
b) True
c) True
d) True
e) TRUE!! It’s on the bottom page 762
f) True
I’m pretty confident that this is the right answer because I had the exact same statement for e).
USB Silent Ionic Air Purifier Fresh Ozone Ionizer .flv
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