The hydronium ion concentration of your gastric fluid is 1.0 x 10^-2. you drink a tablespoon of milk of magnesia, which raises the ph of the

Question

The hydronium ion concentration of your gastric fluid is 1.0 x 10^-2. you drink a tablespoon of milk of magnesia, which raises the ph of the fluid by one unit. what is the resulting concentration of hydroxide ions in the fluid

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Maris 4 years 2021-08-18T21:47:47+00:00 2 Answers 3 views 0

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    0
    2021-08-18T21:49:01+00:00

    Answer:

    1 × 10^-11 units.

    Explanation:

    Given:

    [H+] = 1 × 10^-2

    pH = – log [H+]

    = -log [1 × 10^-2]

    = 2

    The question further said, “which raises the ph of the fluid by one unit”

    pH(new) = 2 + 1

    = 3

    pH + pOH = 14

    pOH = 14 – 3

    = 11

    pOH = – log [OH-]

    [OH-] = 10^-11

    = 1 × 10^-11 units

    0
    2021-08-18T21:49:01+00:00

    Answer:

    [OH⁻] = 1 × 10⁻¹¹ mol/dm³

    Explanation:

    Since the hydronium ion concentration of the gastric fluid is [H₃O]⁺ = 1.0 × 10⁻².

    The pH at this point is pH = -log₁₀[H₃O]⁺ = -log₁₀[1.0 × 10⁻²] = 2

    When milk of magnesia is added, the pH increases by one unit, so the new pH is 1 + 2 = 3

    Since pH + pOH = 14, then pOH = 14 – pH = 14 – 3 = 11

    The hydroxide ion concentration of the fluid is gotten from

    pOH = -log₁₀[OH⁻]

    11 = -log₁₀[OH⁻]

    -11 = log₁₀[OH⁻]

    taking antilog

    [OH⁻] = 1 × 10⁻¹¹ mol/dm³

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