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1-Aluminum sulfate is a coagulant used in water treatment. Aluminum quickly dissociates in water as follows:

Al2(SO4)3·14H2O ® 2 Al3+ + 3 SO4-2 + 14 H2O

(a) If 100 mg/L of aluminum sulfate is added to water and it completely dissolves, how many mmoles/L of Al3+ are present? How many mmoles/L of SO4-2?

(b) For the conditions given in part (b), how many milliequivalents/L of Al3+ are present? How many milliequivalents of SO4-2 are present?

Al3+ + H2O ® Al(OH)+2 + H+

Does this reaction increase, decrease, or not change the pH?

2. If the pH of water is 6.8, what is the [H+] concentration?

If the [H+] concentration is 2x10-8 M, what is the pH?

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Category:- Chemistry
Reference No.:- M91091591

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