Asked Mar 2, 2020

For HF, Ka = 7.2 x 10-4. For a 0.15 M solution of NaF, Find pH and pOH


Expert Answer

Step 1

The Bronsted-Lowry acid-base theory was purposed by Bronsted and Lowery is called Bronsted-Lowry acid-base theory. It states that acid can give H+ ions whereas a base can accept the  ion in its solution. Hence this theory is entirely based on the presence of H+ ion in the given substance.  It purposed the concept of conjugate acid-base pair. A Bronsted acid gives H+ ion to form conjugate base whereas a Bronsted base accepts ion to form its conjugate acid.

Chemistry homework question answer, step 1, image 1

Step 2

NaF ionized to form Na+ and F-. Here F- is strong conjugated base of weak acid HF. Hence in aqueous solution the reaction must be written as:

Chemistry homework question answer, step 2, image 1

Step 3

Calculate Kb from given Ka value:

Chemistry homework question answer, step 3, image 1


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