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QUESTION 19 Which of the following acids should be used to prepare a buffer with a...
For the following reaction, N2 (g) + 1/2O2 (g) N2O (g) At 298 K, ΔSsurr = - 275.34 J/K and ΔSsys = -74.3 J/K. Which of the following statements is true? ΔSuniv = -201.04 J/K and the process is nonspontaneous at 298K ΔSuniv = -201.04 J/K and the process is spontaneous at 298K ΔSuniv = 201.04 J/K and the process is spontaneous at 298K ΔSuniv = -349.6 J/K and the process is nonspontaneous at 298K ΔSuniv = -349.6 J/K and the process...
Which of the following acids should be used to prepare a buffer with a pH of 5.9? HOCH2COOH, Ka = 3.5 × 10–4 HClO2, Ka = 1.1 × 10–2 HBrO, Ka = 2.3 × 10–9 ClCH2COOH, Ka = 1.4 × 10–3 C6H13NO4S, Ka = 7.08 x 10-7
Question 1 2 pts Which of the following acids should be used to prepare a buffer with a pH of 9.3? OHBrO, K; -2.3 x 100 OCH,CO2H, K, - 1.8 10-5 HCO,H, K, - 1.7 x 104 O HCN, K, = 4,9 x 10:10
Which of the following acids is the strongest? The acid is followed by its Ka value. A. HC2H302, 2.5 x 10-5 B. HIO, 2.3 x 10-11 C. HBrO, 2.3 x 10-9 D. HCIO3, 7.9 x 10-5 F CHSCH 45 x 10-5
which of the following acids should be used to prepare a buffer with ph 9.3? A.HbrO Ka= 2.3x10^-9 B.CH3CO2H ka=1.8x10^-5 C. HCO2H Ka= 1.7x10^-4 D. HCN ka= 4.9x10^-10
0/2 pts Question 7 Which of the following will form an acidic aqueous solution? CaCl2 KI MgBr2 NaCl FeCla 0/2 pts Incorrect Question 4 The Ka of HBRO is 2.8 x 109 at 298 K. Calculate the pKb of BrO at that temperature. 2.8 x 10-9 5.45 280,000 8.55 3.6x 10-6
Which of the following weak acids could be used to prepare a buffer solution for a pH of 3.15? A. hydrofluoric acid; Ka = 3.0 x 10-7 B. hypochlorous acid; ka = 3.0 x 10-8 C. acetic acid ; Ka = 1.8x10-5 D.nitrous acid; Ka = 4.5 x 10-4
which of the following acid should be used to prepare a buffer with a pH of 9.0? Which of the following acids should be used to prepare a buffer with a pH of 9.0? A. CH3COZH, K, = 1.8 x 10-5 B. H2CO3, K4 = 4.3 x 10-7 C. HF, K, = 6.6 x 10-4 D. HCIO, K, = 3.0 x 10- E.HCN, kg = 6.2 x 10-10
problem #9 Calculate the equilibrium constant for the following reaction at 25°C. 2H2(g) + O2(g) 2H20cv) Given the following standard free-energy: H2O , -237.2 KJ/mol at 25°C. Problem #10. Given the following data at 25°C: substance sº (J/mol.K) AH', (KJ/mol) 240.45, 33.8 304.33 9.66 NO 249) N2O160) (a) Calculate the value of A Gº for the following reaction at 25°C: 2 NO2(9) N20 (9) (b) Is the formation of NO a spontaneous process at 25°C and standard-state conditions? (a) What...
You work in a chemistry lab, and are asked to prepare 500 mL of a buffer solution with pH-3.20, The weak acid solution concentration in this buffer should be 0.250 M and salt is a solid. The following steps walk you through a step by step process of this preparation. a. Choose the proper weak acids for the buffer solution Table 1. Ionization constant Ka for some weak acids Name Hydrofluoric acid Nitrous acid Fulminic acid Acetic acid Hypochlorous acid...