1 / 6

Buffer Capacity Lab

Buffer Capacity Lab. Buffer Solutions. A buffer solution is a solution that changes pH only slightly when small amounts of a strong acid or a strong base are added. A buffer contains significant concentrations of both a weak acid and its conjugate base, or

bendek
Télécharger la présentation

Buffer Capacity Lab

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Buffer Capacity Lab

  2. Buffer Solutions • A buffer solution is a solution that changes pH only slightly when small amounts of a strong acid or a strong base are added. • A buffer contains significant concentrations of both • a weak acid and its conjugate base, or • a weak base and its conjugate acid.

  3. Importance of Buffers • Our blood is buffered to a pH of 7.4 • Buffers are used when pH must be controlled in experiments. • Proteins • Enzymes

  4. Sodium Acetate Buffer • This buffer relies on the dissociation reaction of acetic acid. CH3COOH CH3COO- + H+

  5. Pure water increases in pH by about 5 pH units when the OH– is added, and decreases by about 5 pH units when the H3O+ is added. In contrast, the same amounts of OH– and H3O+ added to a buffer solution barely change the pH.

  6. Buffer Capacity andBuffer Range • There is a limit to the ability of a buffer solution to neutralize added acid or base. • This buffer capacity is reached before either buffer component has been consumed. • As a rule, a buffer is most effective if the concentrations of the buffer acid and its conjugate base are equal or nearly so.

More Related