posted by bekah on .
Select only the True statements about buffer systems.
Select all that are True.
1. Starting with NH3(aq) and adding a small amount of HCl(aq) will make a buffered solution.
2. The blood buffer, among other things, is supported by carbonic acid and its conjugate base bicarbonate.
3. If a buffer is made from a weak acid and its conjugate base, it will have a pH<7.0.
4. Mixing amounts of NaOH and HCl will make a buffer with a pH=7.0.
5. A mixture of similar amounts of NaH2PO4 and Na2HPO4 in an aqueous solution would have a pH around 7.2.
6. Making a solution of H2SO4(aq) and HSO4−(aq) is an ideal buffer.
7. A mixture of similar amounts of HCO3- and CO32- in an aqueous solution would have a pH around 6.4.
I have tried 7 times
This is a little confusing to me; i.e., #1 will make a buffer but not a very good one. #4 will have a pH = 7.0 but not good buffering characteristics.
I need to know what you don't understand and what have you answered (and why?)