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Chapter 2: Q15CP (page 39)

What is the relationship between the strength of an acid and its pK value?

Short Answer

Expert verified

ThepKa and the strength of the acid is inversely proportional to each other.

Step by step solution

01

Acid strength

The acid strength is indicated by thepKa value. The acid dissociation constant, or pKa, is the negative log of theKa value.

02

Relationship of the pKa value to the acidic strength

The pH scale classifies values below 7 as acidic and those over 7 as basic, whereas, pH 7 is consideredneutral or physiological pH. The amount of H+ions in solution increases under an acidic state, lowering the pH. Similarly, an increase in the concentration of theOH- (hydroxyl) ion elevates the pH value over 7.

03

Dissociation constant of Ka

The acidic strength will be proportionate to the value of Ka, i.e. the value ofka is directly related to the acidity.

pH=-logH+pKa=-logKa

04

Conclusion

Therefore, thehigher theKa value, the lower will be the value PKa. Thelower thePKa value, thestronger will be acid.

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Most popular questions from this chapter

You need a buffer at pH7.5for use in purifying a protein at4掳C . You have chosen Tris, 辫碍8.08,螖贬掳=50办闯脳尘辞濒-1. You carefully make up0.01M Tris buffer, pH7.5at data-custom-editor="chemistry" 25掳C, and store it in the cold to equilibrate it to the temperature of the purification. When you measure the of the temperature-equilibrated buffer it has increased to8.1 . What is the explanation for this increase? How can you avoid this problem?

Question: Draw the structures of the conjugate bases of the following acids:

a.

b.

Describe the osmotic challenges facing a cell placed in pure water or in a high-salt solution.

(a) At any instant, how many water molecules are ionized in 1 L of pure water at pH 7.0? (b) Express this number as a percentage of the total water molecules.

Be able to sketch a titration curve and label its parts for a monoprotic and a polyprotic acid.
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