What are the three States of matter? 

 Which of the following acid-base reactions should go more or less to completion?

(a) HClO4(aq) + OCl-(aq) ➝ ClO4-(aq) + HOCl(aq)

 (b) HF(aq) + I-(aq) ➝ HI(aq) + F-(aq)

   (c) H2SO3(aq) + SO42-(aq) ➝ H2SO4(aq) + SO32-(aq)

    (d) H2S(aq) + 2 Cl-(aq) ➝ S2-(aq) + 2 HCl(aq)

    (e) All of these reactions would go to completion, giving high yields of products.

Which of the following is the strongest Brønsted acid?

(a) NH4+ 

(b) HCl

 (c) HNO3

 (d) HSO4-

 (e) HClO4
 

 At what point in the following titration curve would the pH of the solution be equal to the pKa of the acid?11.gif

 (a) 0 mL

 (b) 50 mL

 (c) 95 mL 

(d) 100 mL

 (e) 120 mL

Which of the following solutions will show the largest pH change when 10 mL of 1 M NaOH is added to it?

   (a) 10 mL of 1 M NaOH  

  (b) 100 mL of water

   (c) 10 mL of 1 M NaNO3

    (d) 10 mL of 0.01 M HOAc

      (e) 100 mL of 0.1 M HOAc and 0.1 M NaOAc
 

 Calculate the pH of a buffer prepared by mixing 0.10 mol of sodium formate and 0.05 mol of formic acid in 1.0 L of solution. (HCO2H: Ka = 1.8 x 10-4)

 (a) 1.8 x 10-4

 (b) 3.44

(c) 4.05

 (d) 5.31

 (e) none of the above
 

 Which of the following solutions would be the best buffer when a small amount of NaOH is added to the solution?

(a) a 1.0 L solution prepared by adding 0.10 mol of carbonic acid and 0.10 mol of sodium bicarbonate.

(b) a 1.0 L solution prepared by adding 0.20 mol of carbonic acid and 0.20 mol of sodium bicarbonate.

(c) a 1.0 L solution prepared by adding 0.10 mol of hydrochloric acid and 0.10 mol of sodium hydroxide.

(d) a 1.0 L solution prepared by adding 0.20 mol of hydrochloric acid and 0.20 mol of sodium hydroxide.

 (e) all of these solutions would have the same buffer capacity.