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A beer has a pH of 4.30. What is the $[H_{3} O^{+}] ?$

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$2.0 \times 10^{- 5}$

$3.0 \times 10^{- 4}$

$2.0 \times 10^{- 4}$

5.0 $\times$ 10^-5

answer is D.

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Detailed Solution

pH=4.3

As we know that,

$pH = - \log_{10} [H^{+}]$

log[H₃O⁺]=−4.3

[H₃O⁺]=10⁻⁴×10^−0.3=5.0×10⁻⁵mol/L

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