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Principles of General Chemistry | 2nd Edition | ISBN: 9780073511085 | Authors: Martin S. Silberberg
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The weak acid HZ has a Ka of 2.55 × 10-4.Calculate the pH

Chapter 18, Problem 53P

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QUESTION:

Problem 53P

The weak acid HZ has a Ka of 2.55 × 10-4.

Calculate the pH of 0.075M HZ.

Calculate the pOH of 0.045 M HZ.

Questions & Answers

QUESTION:

Problem 53P

The weak acid HZ has a Ka of 2.55 × 10-4.

Calculate the pH of 0.075M HZ.

Calculate the pOH of 0.045 M HZ.

ANSWER:

Step 1 of 4

pH and pOH of solutions are interrelated terms which basically represent acidity or basicity. These are integers ranging between 0 to 14 and are calculated using hydronium or hydroxide ions’ concentration.

Given Data:

*The dissociation constant of HZ is .

(a)

The dissociation of weak acid HZ is as follows:

The ICE table of the reaction when  is as follows:

The dissociation constant expression of HZ is as follows:

Substitute the values in the above formula.

On solving above quadratic equation,

Neglecting negative term, the concentration of hydronium ions is .

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