Question

Determine the pH of the solution (to 2 decimal points) after the addition of 11.7 mL of 6.14 M hydrochloric acid (HCl) to 624 mL of 0.735 M phenylamine (aniline) (C₆H₅NH₂).



Assume that the volumes are additive and that the 5% approximation is valid.



A table of pKa values can be found here.
Table 10.2: pKa and pKb values at 25 °C for some common weak acids and their conjugate bases Acid name trifluoroacetic acid trichloroacetic acid oxalic acid dichloroacetic acid Acid formula F3CCOOH Cl CCOOH HOOCCOOH CI2HCCOOH H2SO3 HOSOOH? pKaConjugate base 0.20 FCCOo 0.66 Cl3 CCoo 1.23 HOOCCOO 1.30 CI2HCCOO 1.77 HS03 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 | 1.92 | SO - 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 phenylammonium ion HCIO H3PO CIH2CCOOH BrH2CCOOH 1.95 CIO2 2.12 | H2PO? 2.87 CIH2CCOO 2.90 BrH2CCOO 3.08 C2HoCOO 3.13 C3H5O(COOH)2COO dihydrogen citrate ion10.87 11.88 10.92 C3H50(COOH), 10.80 10.63 10.52 fluoride ion nitrite ion acetvlsalicylate ion formate ion ascorbate ion oxalate ion benzoate ion phenylamine (aniline) HNO CBH O2COOH HCOOH C5H7O,COOH 3.37 | NO? 3.48 CH,O2COo 3.75 HCOO 4.10CH,OCOO 4.19ooccoO 4.20 C6H5COO 9.81 C&H, COOH C6H5NH3 4.63 CH,NH2 9.37

Answer 1

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