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Table 10.2: pKa and pKb values at 25 °C for some common weak acids and their con

ID: 694071 • Letter: T

Question

Table 10.2: pKa and pKb values at 25 °C for some common weak acids and their conjugate bases pKaConjugate base 0.20 FCCOo 0.66 Cl3 CCoo 1.23 HOOCCOO 1.30 CI2HCCOO 1.77 HS03 1.92 So- 1.95 CIO2 2.12 H2P0 2.87 CIH2CCOO 2.90 BrH2CCOO 3.08 C2HoCOO 3.13 C3H5O(COOH)2COO dihydrogen citrate ion10.87 Acid name trifluoroacetic acid trichloroacetic acid oxalic acid dichloroacetic acid Acid formula F3CCOOH Cl CCOOH HOOCCOOH CI2HCCOOH Conjugate base name trifluoroacetate ion trichloroacetate ion hydrogen oxalate ion dichloroacetate ion hydrogen sulfite ion sulfate ion chlorite ion dihydrogen phosphate ion chloroacetate ion bromoacetate ion lactate ion 13.80 13.34 12.70 12.23 12.08 sulfurous acid hydrogen sulfate ion chlorous acid phosphoric acid chloroacetic acid bromoacetic acid lactic acid citric acid hydrofluoric acid nitrous acid acetylsalicylic aci formic acid ascorbic acid hydrogen oxalate ion benzoic acid HCIO H3PO CIH2CCOOH BrH2CCOOH 11.88 10.92 C3Hs O(COOH)3 10.80 10.63 10.52 fluoride ion nitrite ion acetvlsalicylate ion formate ion ascorbate ion oxalate ion benzoate ion phenylamine (aniline) HNO 3.37 NO2 3.48 CH,O2COo 3.75 HCOO 4.10CH,OCOO 4.19ooccoO 4.20 C6H5COO HCOOH 9.81 C&H;, COOH phenylammonium ionHsNH3 4.63 CH,NH2 9.37

Explanation / Answer

The pKb values for (C2H5)3N and H- are taken from the internet.

(C2H5)3N : 2.99

H-: not available; kindly provide.

The higher the pKb value, the less basic is the compound. This is due to the fact that the higher the pKb value, the lower is the corresponding Kb value and consequently, lower is the tendency of the base to form hydroxide, OH- in solution. We have the values of three compounds. These pKb values are (C2H5)3N (2.99), F3CCOO- (13.80) and H2PO4- (11.88). The ranking of these compounds in terms of basicity is

(C2H5)3N – 1

H2PO4- - 2

F3CCOO- - 3

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