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What we will cover ?. Discussion of LabUses for Water (20.1)Water Resources (20.2)Water Treatment (20.3). Lab Discussion. What did you learn?Why do you think we test pH?City water is adjusted to ~pH 7Why is chlorine added to drinking water?To kill bacteria, germs, and control algaeWhat is hard water?Contains a lot of calcium and magnesiumHow would we know we have hard water without testing it?.

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