Please Answer ALL. Thanks. Which of the changes to the system will result in an

Question

Please Answer ALL.

Thanks.

Which of the changes to the system will result in an altered value for the equilibrium constant, K, of the system? A. I B. II C. Ill D. IV E. None of the changes will result in a change in the value of K Which one of the following statements best describes the approximate equivalence point of a titration between acetic acid (in a conical flask) and sodium hydroxide (in a burette) and why it occurs? A. The equivalence point of the titration will be alkaline because at the equivalence point there is a slight excess of the strong base, sodium hydroxide, present B. The equivalence point of the titration will be alkaline because at the equivalence point the acetate ions react with water to produce a small amount of hydroxide ion in solution C. The equivalence point of the titration will be neutral D. The equivalence point of the titration will be acidic because at the equivalence point there is a slight excess of the weak acid, acetic acid, present E. The K_a of acetic acid needs to be known to predict the equivalence point pH of this titration The K_w of water has the following values: 1.14 times 10^-15 at 0 degree C 1.00 times 10^-14 at 25 degree C 5.47 times 10^-14 at 50 degree C A neutral aqueous solution would be best described as: A. pH = 7.00 for all three temperatures B. pH = 14.9 at 0 degree C, pH = 14.0 at 25 degree C and pH = 13.3 at 50 degree C C. [H^+] = 1.00 times 10^-7 for all three temperatures D. [H^+] = [OH^-] for all three temperatures E. Additional information is required to answer the question Which of the following sets of fundamental units represent the joule (J)? A. kg m^-2 s^-2 B. kg m s^-2 C. kg m^-1 s^-2 D. kg m^2 s^-2 E. none of the above

Explanation / Answer

Question 26 is incomplete.

Question 27. option B is correct answer.

The titration of acetic acid (CH3COOH) weak acid with strong base NaOH it forms sodium acetate and water. Through this titration, as the OH- reacts with the H+ from acetic acid, the acetate ion (C2H3O2-) is formed and it reacts with water to form a slightly basic solution.

CH3COO- + H2O ------ CH3COOH + OH-

28. option D is correct.

For neutral solutions always apply [H+] = [OH-] of any temperature.

29. option D is correct.

      SI unit of joule ( J) is kg m2 s-2

As joule is defined as work and the work also represents as Coulomb Volt.

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