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Question

The pOH of pure water at 40 degrees Celsius is 6.8. What is the hydronium ion concentration, [H$_3$O$^+$], in pure water at this temperature?

A. 1.0x10$^{-7}$

B. 6.3x10$^{-8}$

C. 1x10$^{-14}$

D. 1.6x10$^{-7}$

Solution

VerifiedAnswered 3 months ago

Answered 3 months ago

Step 1

1 of 3The hydronium ion concentration in pure water at 40 degrees Celsius with a pOH of 6.8 can be calculated using the relationship between pH and pOH. Subtract the pOH of pure water from 14 to determine the pH.

$\begin{align*} \text{pH}&=14-\text{pOH}\\ &=14-6.8\\ &=7.2 \end{align*}$

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