Question

Using the table, determine the stronger acid from the following pairs of acids: Ka Values for Substances Acting as Weak Acids (25°C) Name Formula pKa Ka Hydrogen sulfate ion HSO4- 2.00 1.0 × 10^-2 Phosphoric acid H3PO4 2.12 7.5 × 10^-3 Hydrofluoric acid HF 3.19 6.5 × 10^-4 Nitrous acid HNO2 3.35 4.5 × 10^-4 Formic acid HCOOH 3.74 1.8 × 10^-4 Lactic acid CH3CH(OH)COOH 3.85 1.4 × 10^-4 Acetic acid CH3COOH 4.76 1.75 × 10^-5 Carbonic acid H2CO3 6.35 4.5 × 10^-7 Dihydrogen phosphate ion H2PO4- 7.18 6.6 × 10^-8 Ammonium ion NH4+ 9.20 6.3 × 10^-10 Hydrocyanic acid HCN 9.21 6.2 × 10^-10 Bicarbonate ion HCO3- 10.32 4.8 × 10^-11 Hydrogen phosphate ion HPO4^2- 12.00 1.0 × 10^-12 Water H2O 15.74 1.8 × 10^-16

          Using the table, determine the stronger acid from the following pairs of acids:
Ka Values for Substances Acting as Weak Acids (25°C)
Name Formula pKa Ka
Hydrogen sulfate ion HSO4- 2.00 1.0 × 10^-2
Phosphoric acid H3PO4 2.12 7.5 × 10^-3
Hydrofluoric acid HF 3.19 6.5 × 10^-4
Nitrous acid HNO2 3.35 4.5 × 10^-4
Formic acid HCOOH 3.74 1.8 × 10^-4
Lactic acid CH3CH(OH)COOH 3.85 1.4 × 10^-4
Acetic acid CH3COOH 4.76 1.75 × 10^-5
Carbonic acid H2CO3 6.35 4.5 × 10^-7
Dihydrogen phosphate ion H2PO4- 7.18 6.6 × 10^-8
Ammonium ion NH4+ 9.20 6.3 × 10^-10
Hydrocyanic acid HCN 9.21 6.2 × 10^-10
Bicarbonate ion HCO3- 10.32 4.8 × 10^-11
Hydrogen phosphate ion HPO4^2- 12.00 1.0 × 10^-12
Water H2O 15.74 1.8 × 10^-16

Using the table, determine the stronger acid from the following pairs of acids:
Ka Values for Substances Acting as Weak Acids (25°C)
Name Formula pKa Ka
Hydrogen sulfate ion HSO4- 2.00 1.0 × 10^-2
Phosphoric acid H3PO4 2.12 7.5 × 10^-3
Hydrofluoric acid HF 3.19 6.5 × 10^-4
Nitrous acid HNO2 3.35 4.5 × 10^-4
Formic acid HCOOH 3.74 1.8 × 10^-4
Lactic acid CH3CH(OH)COOH 3.85 1.4 × 10^-4
Acetic acid CH3COOH 4.76 1.75 × 10^-5
Carbonic acid H2CO3 6.35 4.5 × 10^-7
Dihydrogen phosphate ion H2PO4- 7.18 6.6 × 10^-8
Ammonium ion NH4+ 9.20 6.3 × 10^-10
Hydrocyanic acid HCN 9.21 6.2 × 10^-10
Bicarbonate ion HCO3- 10.32 4.8 × 10^-11
Hydrogen phosphate ion HPO4^2- 12.00 1.0 × 10^-12
Water H2O 15.74 1.8 × 10^-16

Added by Christina M.

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