Question

which solution has the greatest number of hydrogen ions?
blood, ph = 7.2
lemon juice, ph = 2
soda, ph = 3.5
bleach, ph = 13.5

Explanation:

Step1: Recall the pH - hydrogen ion concentration relationship

The formula for calculating the hydrogen - ion concentration $[H^+]$ from pH is $[H^+]=10^{-pH}$. A lower pH value means a higher concentration of hydrogen ions.

Step2: Compare the pH values

We have blood with pH = 7.2, lemon juice with pH = 2, soda with pH = 3.5, and bleach with pH = 13.5.

Step3: Determine the solution with the most hydrogen ions

Since lemon juice has the lowest pH among the given solutions, it will have the greatest number of hydrogen ions.

Answer:

lemon juice, pH = 2