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Chapter 2: 44P (page 140)

Compare the relative acidity of 1-molar aqueous solutions of the following acids.

Short Answer

Expert verified

Kais known as the acid dissociation constant and its value indicates the relative strength of the acid. pKais defined as the negative logarithm (base 10) of Ka. Mathematically, pKa=-logKa.value of strong acids is usually zero or even negative while the value of weaker acids are greater than4 .

Step by step solution

01

Ka and pKa

Kais known as the acid dissociation constant and its value indicates the relative strength of the acid. pKais defined as the negative logarithm (base 10) of Ka. Mathematically, pKa=-logKa.value of strong acids is usually zero or even negative while the value of weaker acids are greater than4 .

02

Species in order of decreasing acidity

The strength of an acid or base is given by its pKavalue. The smaller localid="1662465510222" pKavalue means stronger is the acid while the larger localid="1662465496640" pKavalue means stronger is the base.

pKa  of   NH4Cl  =  9.26pKa  of   HCN  =  9.22pKa  of   CH3COOH  =  4.74pKa  of   HCOOH  =  3.76pKa  of   H2SO4  =  -5pKa  of   HI  =  -11pKa  of   HBr  =  -9

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Most popular questions from this chapter

Two isomers of 1,2 Dichloroethene are known. One has dipole moment of 2.4 D; the other has zero dipole moment. Draw the two isomers, and explain why one has zero dipole moment

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Question: The C ≡ Ntriple bond in acetonitrile has a dipole moment of about 3.6 Dand a bond length of about 1.16 Å. Calculate the amount of charge separation in this bond. How important is the charge separated resonance form in the structure of acetonitrile?
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