Consider the reaction below 2SO_3 (g) rightarrow 2SO_2(g) + O_2(g), Delta H degr

Question

Consider the reaction below 2SO_3 (g) rightarrow 2SO_2(g) + O_2(g), Delta H degree = + 198 kJ All of the following changes would shift the equilibrium to the left except one. Which one would not cause the equilibrium to shit to the left? Removing some SO_3 decreasing the temperature increasing the container volume adding some SO_2 Calculate the pH of a solution if its [OH^-] = 0.000700 M and indicate whether the solution is acidic, basic, or neutral. 3.15, acidic 17.2 basic 10.8, basic 11, basic Which one of the conjugate bases of the following Bronsted-Lowry acids are incorrect? CIO^- for HCIO HS^- for H_2S H_2SO_4 for HSO_4^- NH_3 for NH_4^- Predict whether aqueous solutions of the following compounds are acidic, basic, or neutral. Find the incorrect answer. KNO_3(neutral) NaC_2H_3O_2(basic) KCIO(acidic) NaCN (basic) Calculate the pH of a buffer that is 0.20 M in formic acid and 0.15 M sodium format (K_a = 1.8 times 10^-4) 2.4 times 10^-4 3.63 0.82 8.33 If X is the solubility of a salt in moles per liter, which one of the following K_sp expression is incorrect? Ag_2S, K_sp = 4X^3 AgCl, K_sp = X^2 BaSO_4, K_sp = 4X^2 Cu(OH)_2, K_sp = 4X^3

Explanation / Answer

19) no.of gas reactants = 2 , but no.of gas products = 3

Increase the volume if container shifts the equilibrium towards not no.of gas molecules. Hence the above equilibrium shift s to right side.

So, (C)

20) pH = 14 + Log[OH-] = 14 + log(0.000700) = 10.84

The solution is basic.

So, (C)

21) (C) H2SO4 is conjugate acid for HSO4-

22) (C) KClO solution is basic because it is formed by weak acid, HClO and strong base KOH

23) (B)

pH = pKa + Log([salt]/[acid])

pH = 3.74 + log(0.15/0.20) = 3.61

24) (C) Kappeta for BaSO4 = x2

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