Question

_____9. An excess of Mg(s) is added to 100. mL of 0.400 M HCl. At 0 ^oC and 1 atm pressure, what volume of H₂ gas can be obtained?

(A) 22.4 mL

(B) 44.8 mL

(C) 224 mL

(D) 448 mL

(E) 896 mL

_____10. How can 100. mL of sodium hydroxide solution with a pH of 13.00 be converted to a sodium hydroxide solution with a pH of 12.00?

(A) By diluting the solution with distilled water to a total volume of 108 mL

(B) By diluting the solution with distilled water to a total volume of 200 mL

(C) By diluting the solution with distilled water to a total volume of 1.0 L

(D) By adding 100. mL of 0.10 M HCl.

(E) By adding 100. mL of 0.10 M NaOH.

_____ 11. Ascorbic acid, H₂C₆H₆O₆(s), is a diprotic acid with K₁ = 7.9 × 10^-5 and K₂ = 1.6 × 10^-12. In a 0.005 M aqueous solution of ascorbic acid, which of the following species is present in the lowest concentration?

(A) H₂O(l)

(B) H₃O⁺(aq)

(C) H₂C₆H₆O₆(aq)

(D) HC₆H₆O₆^-(aq)

(E) C₆H₆O₆^2-(aq)