Answer:
The most common position for an double bond in an unsaturated fatty acid is delta 9 (Δ⁹)
Explanation:
Unsaturated fatty acids are carboxylic acids which contains one or more double bonds. The chain length as well as the number of double bonds is written separated by a colon. The positions of the double bonds are specified starting from the carboxyl carbon, numbered as 1, by superscript numbers following a delta (Δ). For example, an 18-carbon fatty acid containing a single double bond between carbon number 9 and 10 is written as 18:1(Δ⁹).
In most monounsaturated fatty acids, the double bond is between C-9 and C-10 (Δ⁹), and the other double bonds of polyunsaturated fatty acids are generally Δ¹² and Δ¹⁵. This positioning is due to the nature of the biosynthesis of fatty acids. In the mammalian hepatocytes, double bonds are introduced easily into fatty acids at the Δ⁹ position, but cannot introduce additional double bonds between C-10 and the methyl-terminal end. However, plants are able to introduce these additional double bonds at the Δ¹² and Δ¹⁵ positions.
pH is equivalent to the negative log of the concentration of
H in molarity, that is:
pH = - log [H]
so the concentration is:
8.05 = - log [H]
[H] = 8.91 x 10^-9 M
the absolute error is:
8.07 = - log [H’]
[H’] = 8.51 x 10^-9 M
absolute error = 8.91 x 10^-9 M - 8.51 x 10^-9 M = 0.4 x
10^-9 M
Therefore:
<span>8.91 x 10^-9 M ± 0.4 x 10^-9 M</span>
