Q15CP What is the relationship between... [FREE SOLUTION]

Chapter 2: Q15CP (page 39)

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

Short Answer

Expert verified

The ${pK}_{a}$ and the strength of the acid is inversely proportional to each other.

Step by step solution

Acid strength

The acid strength is indicated by the ${pK}_{a}$ value. The acid dissociation constant, or ${pK}_{a}$ , is the negative log of the $K_{a}$ value.

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 the ${OH}^{-}$ (hydroxyl) ion elevates the pH value over 7.

Dissociation constant of Ka

The acidic strength will be proportionate to the value of $K_{a}$ , i.e. the value of $k_{a}$ is directly related to the acidity.

$\begin{array}{l} pH = - \log (H^{+}) \\ {pK}_{a} = - \log (K_{a}) \end{array}$

Conclusion

Therefore, thehigher the $K_{a}$ value, the lower will be the value ${PK}_{a}$ . Thelower the ${PK}_{a}$ value, thestronger will be acid.

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91影视

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

Short Answer

Step by step solution

Acid strength

Relationship of the pKa value to the acidic strength

Dissociation constant of Ka

Conclusion

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