Answer
a. $[H^+] = 0.000003162$ moles per liter
b. decreases
c. less acidic
Work Step by Step
$pH = -\log [H^+]$
$H^+$ is the hydrogen ion concentration
a. pH of the saliva is at 5.5. Find hydrogen ion concentration.
$5.5 = -\log [H^+]$
$10^{-5.5} = [H^+]$
$[H^+] = 0.000003162$ moles per liter
b. Hydrogen Ion concentration decreases as pH goes up (when Marco gets better); the higher the pH, the lower the concentration
c. at a pH of 6.5, compared to a pH of 5.5, it is LESS acidic
