pH Calculations?

2017-05-12 12:02 pm

1.) 15 L of a solution containing 1 mole of HCl

2.) 738 L of a solution containing 0.34 mole of HCl

3.)1098 L of a solution containing 7.543 moles of HBr

回答 (1)

戇戇居士

2017-05-12 12:21 pm

✔ 最佳答案

1.)
HCl is a strong acid. 1 mole of HCl completely dissociates in aqueous solution to give 1 mole of H⁺ ions.
[H⁺] = [HCl]ₒ = (1 mol) / (15 L) = 1/15 M
pH = -log[H⁺] = -log(1/15) = 1.18

2.)
HCl is a strong acid. 1 mole of HCl completely dissociates in aqueous solution to give 1 mole of H⁺ ions.
[H⁺] = [HCl]ₒ = (0.34 mol) / (738 L) = 0.34/738 M
pH = -log[H⁺] = -log(0.34/738) = 3.34

3.)
HBr is a strong acid. 1 mole of HBr completely dissociates in aqueous solution to give 1 mole of H⁺ ions.
[H⁺] = [HBr]ₒ = (7.543 mol) / (1098 L) = 7.543/1098 M
pH = -log[H⁺] = -log(7.543/1098) = 2.163

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