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- What are the characteristics of PH levels, it's contribution to pollution, and chemicals used to treat low PH Levels?Which of the following is not a stage in purification of drinking water?a. filtration b. chlorination c. activated sludge d. sedimentationI am unsure how to answer question number 2: What volume of 0.100 M HCl would have to be added to this buffering system, to reduce the pH to 7.1?