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Principles of General Chemistry | 2nd Edition | ISBN: 9780073511085 | Authors: Martin S. Silberberg
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(a) What are [H3O+], [OH?], and pOH in a solution with a

Chapter 18, Problem 18P

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QUESTION:

Problem 18P

(a) What are [H3O+], [OH?], and pOH in a solution with a pH of 9.85? (b) What are [H3O+], [OH?], and pH in a solution with a pOH of 9.43?

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QUESTION:

Problem 18P

(a) What are [H3O+], [OH?], and pOH in a solution with a pH of 9.85? (b) What are [H3O+], [OH?], and pH in a solution with a pOH of 9.43?

ANSWER:

Solution 18P

Step 1

(a) Here we have to explain what are [H3O+], [OH-] and pOH in a solution with a pH of 9.85.

The relationship between [H3O+] and pH is pH = -log [H3O+] and [H3O+] = 10-pH

Similarly the relationship between  [OH-] and pOH is, pOH = -log [OH-] and [OH-] = 10-pOH

Apart from this, the relationship between pH and pOH is,

pH + pOH = 14

[H3O+] = 10-pH = 10-9.85 = 1.4110-10 M H3O+

pOH = 14-pH = 14 - 9.85 = 4.15

[OH-] = 10-pOH

          = 10-4.15 = 7.110-5 M OH-

Thus from the above calculation,  [H3O+], [OH-] and pOH is found to be 1.4110-10 M, 7.110-5 M and 4.15 respectively.

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