March 28, 2024, 05:31:49 PM
Forum Rules: Read This Before Posting


Topic: Questions about buffers and solubility  (Read 2554 times)

0 Members and 1 Guest are viewing this topic.

Offline mattc82

  • Very New Member
  • *
  • Posts: 2
  • Mole Snacks: +0/-0
Questions about buffers and solubility
« on: March 06, 2008, 05:41:35 PM »
Could someone please help me out on these questions?


1.Which one of the following pairs of solutions will act as the best buffer system?
a. NaNO2, H2O  b. NaOH, HNO2 c. H2O, NaCl  d. NaNO2 , HNO2


2. Which one of the following solutes will dissolve to form a basic solution?
a. KCl b. NaF c. NH3 d. NaNO3

3. In which of the following solutions is iron(II) hydroxide least soluble?
Ksp for Fe(OH)2 = 2 x 10-15
a. water b. 1. 0 M HCl c. 1.0 M NaOH d. 0.1 M NaOH

4.In a solution with a pOH of 4.00 which one of the following is true?
a. [H+] = 4.00 b. [OH-] = 4.00 c. [H+] < [OH-]
d. [H+] > [OH-]

5. You want to titrate ammonia, NH3, with HCl. Which one of the following indicators would be the best for this titration? The pH range in which the indicator changes color is indicated.

a. thymol blue, 8.0-9.6 b. methyl violet, 0.7-1.2
c. methyl red, 4.8-6.0 d. phenol red, 7.0-8.5

6. A common intercellular buffer inside cells is phosphate buffer, NaH2PO4 and
Na2HPO4. Designate the acid in this buffer and write the net ionic equation that shows how this buffer will neutralize OH-.

If anyone can point me in the right direction I would really appreciate it. Thanks

Offline AWK

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 7979
  • Mole Snacks: +555/-93
  • Gender: Male
Re: Questions about buffers and solubility
« Reply #1 on: March 07, 2008, 01:17:59 AM »
Definition of buffers. Think also about dissociation, hydrolysis and neutralization reactions
AWK

Sponsored Links