# Problem: At body temperature of 37.0°C, K w = 2.5 x 10-14. Calculate the [H3O+] if the [OH -] = 3.9 x 10-3 M.A. 2.5 x 10-12 MB. 6.4 x 10-12 MC. 3.9 x 10-3 MD. 1.0 x 10-7 ME. 2.5 x 10-14 M

###### FREE Expert Solution

We’re being asked to determine the H3O+ concentration if [OH] = 3.9 × 10–3 M. We’re given Kw = 2.5 × 10–14 at 37.0 ˚C.

Recall that Kw is the auto-ionization product of water. For the following reaction:

2 H2O(l)  H3O+(aq) + OH(aq)

the auto-ionization product constant is given by:

Note that each concentration is raised by the stoichiometric coefficient: [H3O+] and [OH] are raised to 1.

###### Problem Details

At body temperature of 37.0°C, K w = 2.5 x 10-14. Calculate the [H3O+] if the [OH -] = 3.9 x 10-3 M.

A. 2.5 x 10-12 M

B. 6.4 x 10-12 M

C. 3.9 x 10-3 M

D. 1.0 x 10-7 M

E. 2.5 x 10-14 M

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the pH and pOH concept. You can view video lessons to learn pH and pOH. Or if you need more pH and pOH practice, you can also practice pH and pOH practice problems.

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Our tutors rated the difficulty ofAt body temperature of 37.0°C, K w = 2.5 x 10-14. Calculate ...as medium difficulty.

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Based on our data, we think this problem is relevant for Professor Graves' class at FIU.