<span>I think the pKa for acetic acid is about 4.74. Therefore Acetic
acid/acetate buffer will work best at 4.74 +/- 1 pH unit and so the pH 8 is far
removed from that. Hence it would not buffer at that pH at all.</span>
C. calcium is your answer
Answer:
Homologous features
Explanation:
If two or more species share a unique physical feature, such as a complex bone structure or a body plan, they may all have inherited this feature from a common ancestor. Physical features shared due to evolutionary history (a common ancestor) are said to be homologous.
Answer:
Even in pure water ions tend to form due to random processes (producing some H+ and OH- ions). The amount of H+ that is made in pure water is about equal to a pH of 7. That's why 7 is neutral. ... In pure water near room temperature, the concentration of H+ is about 10-7 moles/liter, which gives a pH of 7.
