What are the concentrations of hydroxide and hydronium ions in a solution with a pH of 8.3? 2.9 × 10–5 M H3O+ and 3.4 × 10–10 M

Question

What are the concentrations of hydroxide and hydronium ions in a solution with a pH of 8.3?

2.9 × 10–5 M H3O+ and 3.4 × 10–10 M OH–
3.1 × 10–6 M H3O+ and 3.2 × 10–9 M OH–
5.0 × 10–9 M H3O+ and 2.0 × 10–6 M OH–
6.3 × 10–11 M H3O+ and 1.6 × 10–4 M OH–

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Thu Thủy 1 month 2021-08-05T16:36:38+00:00 1 Answers 4 views 0

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    2021-08-05T16:38:17+00:00

    5.0 x 10-9 M H3O+ and 2.0 x 10-6 M OH-
    Explanation:
    To find H3O+, do the following:
    pH = -log[H3O+]
    -pH = log[H3O+]
    antilog -(8.3) = antilog log (antilog and log cancel out) [H3O+]
    5.0 x 10^-9 = [H3O+]
    To find OH, you need to know pOH
    pOH = 14 – pH
    pOH = 14 – 8.3
    pOH = 5.7
    To find OH-, use a similar formula to the one above:
    pOH = -log [OH-]
    -pOH = log [OH-]
    antilog – (5.7) = antilog log (antilog and log cancel out) [OH-]
    2.0 x 10^-6 = [OH-]

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