HW2 - Question 1 0 out of 5 points The pKa of acetic acid...

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Question 1 0 out of 5 points The pK a of acetic acid, , is 4.76. A buffer solution was made using an unspecified amount of acetic acid and 0.30 moles of NaC 2 H 3 O 2 in enough water to make 1.50 liters of solution. Its pH was measured as 4.50 on a meter. How many moles of HC 2 H 3 O 2 were used? Selected Answer: 1.09 mol Question 2 5 out of 5 points In the following equilibrium where HX is a stronger acid than HY, predict the position of the equilibrium NaY + HX Δ NaX + HY Selected Answer: The equilibrium favors the weakest acid and the weakest base. Question 3 0 out of 5 points Given the following substances in order of increasing acid strength, HOCl( aq ) < HC 2 H 3 O 2 ( aq ) < HC 2 O 4 - ( aq ) < HOCN( aq ) < HNO 2 ( aq ) < HCl( aq ) Which species listed below is the strongest base of that set? Selected Answer: HOCl( aq ) Question 4 5 out of 5 points A 0.400 M solution of an acid, HQ, has a pH = 1.301. What is the value of the ionization constant, K a , for this acid? Selected Answer: 7.14 × 10 -3 Question 5 5 out of 5 points A 0.100 M solution of an acid, HA, has a pH = 2.00. What is the value of the ionization constant, K a for this acid? Selected Answer: 1.1 × 10 -3 Question 6 0 out of 5 points A buffer solution is prepared by taking 0.400 moles of acetic acid (pK a = 4.76) and 0.250 moles of calcium acetate in sufficient water to make 1.400 liters of solution. Calculate the pH of this solution. Selected Answer: 4.96 Question 7 5 out of 5 points An aqueous solution at 25.0 ° C has an H + concentration of 4.0 x 10 -2 molar. What is the OH - concentration in the same solution, in moles per liter? Selected Answer: 2.5 x 10 -13 Question 8 0 out of 5 points The pK a of acetic acid, HC 2 H 3 O 2 , is 4.76. A buffer solution was made using an unspecified amount of NaC 2 H 3 O 2 and 0.30 moles of acetic acid in enough water to make 2.00 liters of solution. Its pH was measured as 4.60. How many moles of
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NaC 2 H 3 O 2 were used? Selected Answer: 0.42 mol Question 9 0 out of 5 points Which is the strongest oxoacid? Selected Answer: > Question 10 0 out of 5 points A buffer solution is prepared by taking 0.400 moles of acetic acid (pK a = 4.76) and 0.250 moles of sodium acetate in sufficient water to make 1.400 liters of solution. Calculate the pH of this solution. Selected Answer: 4.96 Question 11 5 out of 5 points For the system NH 2 OH + CH 3 NH 3 + CH 3 NH 2 + NH 3 OH + the position of the equilibrium lies to the left. Which is the strongest acid in the system? Selected Answer: NH 3 OH + Question 12 0 out of 5 points Given the following two solutions: 0.200M HC 2 H 3 O 2 ( aq ) with pK a = 4.76 0.200M NaOH( aq ) A mixture is made using 50.0 mL of the HC 2 H 3 O 2 and 25.0 mL of the NaOH. What is its pH? Selected
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This note was uploaded on 02/22/2011 for the course CHEM 301 taught by Professor Norris during the Spring '11 term at FSU.

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HW2 - Question 1 0 out of 5 points The pKa of acetic acid...

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