ALL ABOUT BUFFERS 1. All of the following combinations are not buffer solution, EXCEPT: a HI and NaI b NH3 and NH4Cl c HNO3 and NH4NO3 d HClO4 and NaClO4 2. Which of the following pairs can act as buffer? a CO2 / H2CO3 b Na2SO4 / H2SO4 c Na3PO4 / H3PO4 d NaCl / HCl 3. The pH of the buffer will NOT change after the addition of large amounts of water True False
ALL ABOUT BUFFERS
1. All of the following combinations are not buffer solution, EXCEPT:
| a |
HI and NaI |
|
| b |
NH3 and NH4Cl |
|
| c |
HNO3 and NH4NO3 |
|
| d |
HClO4 and NaClO4 |
2. Which of the following pairs can act as buffer?
| a |
CO2 / H2CO3 |
|
| b |
Na2SO4 / H2SO4 |
|
| c |
Na3PO4 / H3PO4 |
|
| d |
NaCl / HCl |
3. The pH of the buffer will NOT change after the addition of large amounts of water
True
False
4. A buffer is prepared using 0.085 Mformic acid (HCOOH) and 0.085 Msodium formate (NaHCOO). Which of the following statements is FALSE?
| a |
The addition of 0.02 M HCl will decrease the pH slightly |
|
| b |
The addition of 0.02 M NaOH will increase the pH slightly |
|
| c |
The formate ion can neutralize bases added to the buffer |
|
| d |
The addition of 1.0 M HCl will cause the pH to drop significantly |
|
| e |
Diluting the solution with pure water won't change the pH of the buffer
|
5. The following are true for buffer, EXCEPT:
| a |
Buffering is due to ion in common with the substance already in equilibrium |
|
| b |
Prevent pH from varying |
|
| c |
Made from weak acid and weak base salt |
|
| d |
The relationship between the buffer capacity and buffer concentrations is based from Van Slyke equation |
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