Question #43ded

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Question #43ded

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Answer 1 · 2014-05-11T19:47:25

The hydrogen ion concentration is $4.0 \times 10^{-8} l mol/L$ $4.0 ×10^"-8"color(white)(l) "mol/L"$ .

Explanation:

The definition of pH is

$pH = - log [H_{3} O^{+}]$ $"pH" = -log["H"_3"O"^+]$

To get the hydrogen ion concentration, we take the antilogarithm of the pH (the $10^{x}$ $10^x$ button on the calculator).

$[H_{3} O^{+}] = 10^{-pH} l mol/L = 10^{-7.4} l mol/L = 4.0 \times 10^{-8} l mol/L$ $["H"_3"O"^"+"] = 10^"-pH"color(white)(l) "mol/L" = 10^"-7.4"color(white)(l) "mol/L"= 4.0 × 10^"-8" color(white)(l)"mol/L"$

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Question #43ded

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