Answer to Question #224799 in General Chemistry for sam

Question

4. Which of the following solutions can NOT act as an effective buffer?

a) 50.0 mL 0.10M NH3 + 50.0 mL 0.10M NH4Cl

b) 50.0 mL 0.10 M HF + 50.0 mL 0.10 M NaF

c) 50.0 mL 0.10 M HBr + 50.0 mL 0.10 M NaOH

d) 50.0 mL 0.10 M HF + 30.0 mL 0.10 M KOH

e) 50.0 mL 0.10 M NH3 + 20.0 mL 0.10 M HCl

5. Which of the following mixtures is most likely to be an ideal solution?

a) NaCl and H2O

b) CH3CH2OH and C6H6

c) C7H16 and H2O

d) C7H16 and C8H18

e) None of the above.

6. Potassium hydroxide (KOH) is a strong base that is very soluble in water. Assuming complete dissociation, what is the pH of a 10.M solution of potassium hydroxide?

a) -1.00 b) 1.00 c) 13.00 d) 14.00 e) 15.00

7. How many electrons appear in the following half reaction when it is balanced?

MnO4- → Mn2+

a) 1 b) 2 c) 3 d) 4 e) 5

Answer 1

4. d, e

5. a

6. c

7. d