4. Normal gastric juice has a pH of about 2. Assuming that normal gastric juice is primarily aqueous HCl, what is the concentration of HCl in the stomach?
The concentration of HCl in the stomach can be calculated using the formula pH = -log[H+]. Given that the pH of normal gastric juice is about 2, we can calculate the concentration of HCl as follows:
pH = -log[H+]
2 = -log[H+]
-2 = log[H+]
[H+] = 10^-2
[H+] = 0.01 mol/L
Therefore, the concentration of HCl in the stomach is about 0.01 mol/L.