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P1. (Sec. 16.2) What is the pH of a solution prepared by adding 0.45 moles of formic acid HCO2H, and 0.40 moles of sodium formate, NaCO,H, in enough water to make a 1.0-liter solution? (Formic Acid: K 1.81 10-) a) 4.32 b) 3.69 c) 5.52 d) 7.32 e) 9.11 P2. (Sec. 16.2) What is the pH of a solution prepared by adding 100 mL of a 0.25 M solution of sodium acetate, NaC2H,O2, into 110 mL of 0.30 M acetic acid, HC2H O2? (Acetic Acid: K 1.8 x 10) a) 10.70 b) 8.65 c) 5.76 d) 4.62 e) 2.85 (Sec. 16.2) What is the pH of a solution prepared by adding 125 ml of a 0.095 M solution of potassium nitrite, KNO2, into 175 mL of 0.15 M nitrous acid, HNO2? Nitrous Acid: Ka 4.5 x 104) a) 11.51 b) 8.71 c) 6.11 ) 4.64 e) 3.00 P4. (Sec. 16.2) What is the pH of a solution prepared by adding 35.5 mL of a 0.095 M soluti of potassium cyanide, KCN, into 185 mL of 0.25 M hydrocyanic acid, HCN? Hydrocyanic Acid: Ka 4,9x 10-10) sl y Ku M a) 8.17 b) 4.04 c) 3.98 d) 6.49 e) 9.89 HCN P5. (Sec. 16.3) A buffer solution is prepared by adding 35.5 mL of a 0.082 M solutiono benzoate, LiC&HsCO2, into 145.5 mL of 0.17 M benzoic acid, HCsHsCO2. What is the buffer solution? (Benzoic Acid: K 6.5x 10)

Answer 1

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