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A buffer is prepared by mixing 204 mL of 0.452 M HCl and 0.50 L of 0.400 M sodium acetate. (See Appendix) a) What is the pH? b) How many grams of KOH must be added to 0.500 L of the buffer to change the pH by 0.15 units?

A buffer is prepared by mixing 204 mL of 0.452 M HCl and 0.50 L of 0.400 M sodium acetate. (See Appendix) a) What is the pH? b) How many grams of KOH must be added to 0.500 L of the buffer to change the pH by 0.15 units?

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Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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5. A buffer is prepared by mixing 204 mL of 0.452 M HCl and 0.50 L of 0.400 M sodium acetate.
(See Appendix)
a) What is the pH?
b) How many grams of KOH must be added to 0.500 L of the buffer to change the pH by 0.15 units?

Table of Acids with Ka and pKa values Acid НА A Ка pKa H;O* Hydronium ion Iodic Oxalic (1) Sulfurous (1) Sulfuric (2) HO IO; HC2O4 HSO; 1 0.0 1.6 x 101 5.9 x 10 1.54 x 102 1.2 x 102 1.1 x 10 7.52 x 10* 5.0 x 10 1.4 x 10 8.4 x 10 7.2 x 10* 4.0 x 10 1.77 x 10* 1.38 x 10* 7.9 x 10 6.46 x 10 6.4 x 10 1.9 x 10 1.8 x 10° 1.76 x 10 1.34 x 10 5.6 x 10 4.0 x 10* 4.3 x 10" 1.02 x 10 8/9.3 x 10* 1.0 x 10-//9.1 x 10-8 6.23 x 10 3.5/3.0 x 10* 2х 10% 6.17 x 1010 5.8 x 1010 5.6 х 1010 1.6х 1010 4.8 x 10" 2 x 10" | 6.0 x 10-1º/3.0 x 10-12 2.4 x 1012 1.6 x 10*12 4.8/2.2 x 1013 1.0 x 10 HIO3 0.80 H»C2O4 1.23 H;SO3 HSO; HC1O, H;PO4 H3ASO4 CH,CICOOH H;C¿H;O7 HF HNO, НСООН HCH3H§O3 H¿C¿HO6 C3HsCOOH 1.81 1.92 Chlorous ClO, H,PO, 1.96 Phosphoric (1) Arsenic (1) Chloroacetic Citric (1) Hydrofluoric Nitrous Formic 2.12 2.30 CH,CICOO H,C¢H;O;¯ F 2.85 3.08 3.14 NO 3.39 HCOO 3.75 Lactic CH;HsO; 3.86 Ascorbic (1) Benzoic Охalic (2) Hydrazoic Citric (2) 4.10 C¢H;COO" 4.19 C,0, 4.19 HN3 H,C¿H5O7¯ CH;COOH CH;CH,COOH C;H¾NH N3 4.72 HC¿H;O;² 4.74 Acetic CH;COO" CH;CH,COO C;H¾N 4.75 Propionic Pyridinium ion Citric (3) Carbonic (1) Sulfurous (2) Arsenic (2) Hydrosulfuric Phosphoric (2) Нурochlorous Нуpobromous Hydrocyanic Boric (1) Ammonium ion Phenol Carbonic (2) Нурoiodous Arsenic (3) 4.87 5.25 3- 5.40 6.37 H,CO} HSO; H;AsOq¨ H2S HCO; SO HASO 6.91 7.10/7.03 HS 04.רוך H,PO4 HCIO НРО Clo 7.21 7.46/7.53 HBrO BrO" 8.70 HCN CN 9.21 9.23 H;BO3 NH," C¢H;OH HCO; H;BO; NH3 9.25 9.80 10.32 HIO IO 10.70 Aso, HO; 3- HASO,² 9.22/11.53 Hydrogen peroxide Ascorbic (2) Phosphoric (3) 11.62 HC,H&O6¯ НРО H;O 11.80 PO, 12.32/12.66 Water OH 14.0
Transcribed Image Text:Table of Acids with Ka and pKa values Acid НА A Ка pKa H;O* Hydronium ion Iodic Oxalic (1) Sulfurous (1) Sulfuric (2) HO IO; HC2O4 HSO; 1 0.0 1.6 x 101 5.9 x 10 1.54 x 102 1.2 x 102 1.1 x 10 7.52 x 10* 5.0 x 10 1.4 x 10 8.4 x 10 7.2 x 10* 4.0 x 10 1.77 x 10* 1.38 x 10* 7.9 x 10 6.46 x 10 6.4 x 10 1.9 x 10 1.8 x 10° 1.76 x 10 1.34 x 10 5.6 x 10 4.0 x 10* 4.3 x 10" 1.02 x 10 8/9.3 x 10* 1.0 x 10-//9.1 x 10-8 6.23 x 10 3.5/3.0 x 10* 2х 10% 6.17 x 1010 5.8 x 1010 5.6 х 1010 1.6х 1010 4.8 x 10" 2 x 10" | 6.0 x 10-1º/3.0 x 10-12 2.4 x 1012 1.6 x 10*12 4.8/2.2 x 1013 1.0 x 10 HIO3 0.80 H»C2O4 1.23 H;SO3 HSO; HC1O, H;PO4 H3ASO4 CH,CICOOH H;C¿H;O7 HF HNO, НСООН HCH3H§O3 H¿C¿HO6 C3HsCOOH 1.81 1.92 Chlorous ClO, H,PO, 1.96 Phosphoric (1) Arsenic (1) Chloroacetic Citric (1) Hydrofluoric Nitrous Formic 2.12 2.30 CH,CICOO H,C¢H;O;¯ F 2.85 3.08 3.14 NO 3.39 HCOO 3.75 Lactic CH;HsO; 3.86 Ascorbic (1) Benzoic Охalic (2) Hydrazoic Citric (2) 4.10 C¢H;COO" 4.19 C,0, 4.19 HN3 H,C¿H5O7¯ CH;COOH CH;CH,COOH C;H¾NH N3 4.72 HC¿H;O;² 4.74 Acetic CH;COO" CH;CH,COO C;H¾N 4.75 Propionic Pyridinium ion Citric (3) Carbonic (1) Sulfurous (2) Arsenic (2) Hydrosulfuric Phosphoric (2) Нурochlorous Нуpobromous Hydrocyanic Boric (1) Ammonium ion Phenol Carbonic (2) Нурoiodous Arsenic (3) 4.87 5.25 3- 5.40 6.37 H,CO} HSO; H;AsOq¨ H2S HCO; SO HASO 6.91 7.10/7.03 HS 04.רוך H,PO4 HCIO НРО Clo 7.21 7.46/7.53 HBrO BrO" 8.70 HCN CN 9.21 9.23 H;BO3 NH," C¢H;OH HCO; H;BO; NH3 9.25 9.80 10.32 HIO IO 10.70 Aso, HO; 3- HASO,² 9.22/11.53 Hydrogen peroxide Ascorbic (2) Phosphoric (3) 11.62 HC,H&O6¯ НРО H;O 11.80 PO, 12.32/12.66 Water OH 14.0
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