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Chapter 14: Q14.3-44 E (page 830)

Both \(HF and HCN\)ionize in water to a limited extent. Which of the conjugate bases \(F - or CN - \), is the stronger base? See Table 14.3.

Short Answer

Expert verified

\(C{N^ - }\) is the stronger base.

Step by step solution

01

Define strong base

A strong base is a substance capable of removing a proton from a very weak acid. In water, they completely dissociate into their ions.

02

Compare the stronger base

We have to identify which of the conjucate bases \(F - or CN - \) is the stronger base. We know that the stronger an acid, the weaker is its conjugated base pair. To identify the stronger base, compare the \({K_b}\)values of weak bases and not weak acids. The stronger acids will have higher \({K_a}\)values. \(HF\) has a higher \({K_a}\) value than \(HCN.\) \(HF\) is a stronger acid than \(HCN\). \({F^ - }\) is a weaker base than \(C{N^ - }\) because its conjugated acid is a stronger acid than the conjugated acid of \(C{N^ - }.\)

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Most popular questions from this chapter

Rank the compounds in each of the following groups in order of increasing acidity or basicity, as indicated, and explain the order you assign.

  1. \(acidity: HCl, HBr, HI\)
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