1. Which of the followings will be the best candidate to make a buffer of pH = 8.50 a. HC₂H₂O₂ (K=1.8x10³) b. H.ASO, (K 5.1x10-10) c. HBrO (K₂=2.5x10³) d. HIO (K₂=2.3x10-¹¹)

Which of the following compounds has the shortest Xmax? O II OI ||| CONV III IV

What is the mean of the values 8.9, 9.0, 4.0, 7.0, and 3.0? Give your answer to the first decimal place.

Which is the correct balanced chemical equation for the reaction of solid potassium with liquid water. Express your answer as a chemical equation. Identify all of the phases in your answer. O K(s) +H2O(1)→KOH(aq) + H*(aq) O 4K(s) + 2H2O(1)→4KH(aq) + 02(g) О K's) + 2H2О() -КН:(аq) + 2ОH (аq) О K's) + 2H,О()--K(ОН)2(аq) + Ha(s) О 2K(s) + 2H>О() +2КОН(аq) + H- (g)

Which of the following values for R2 shows the strongest correlation between the X and Y values in a data set?     0.0184     0.0047     0.500     0.981     0.9678

Calculate the equilibrium constant for each of the reactions at 25°C. Standard Electrode Potentials at 25 °C Reduction Half-Reaction E° (V) Fe+(aq) + 3 e → Fe(s) -0.036 Sn²+ (aq) + 2 e → Sn(s) -0.14 2+ Cu" (ag) + 2 е — Cu(s) 0.16 O2 (g) + 2 H2O(1) +4 e¯ →4 OH (aq) 0.40 Cl2(9) + 2 е —2 CI 1.36 I2(s) + 2 e → 2 1 0.54

14.3462 +2.55 Express your answer in appropriate significant figures. — ΑΣΦ ftermitte ΠΡΕΠΕΙ Ν