which solution has the greatest number of hydrogen ions?\no blood, ph = 7.2\no lemon juice, ph = 2\no soda…

Explanation:

Step1: Recall pH - hydrogen ion concentration relation

The formula for hydrogen - ion concentration $[H^+]$ in terms of pH is $[H^+]=10^{-pH}$.

Step2: Calculate $[H^+]$ for blood

For blood with pH = 7.2, $[H^+]_{blood}=10^{-7.2}\ mol/L$.

Step3: Calculate $[H^+]$ for lemon juice

For lemon juice with pH = 2, $[H^+]_{lemon\ juice}=10^{-2}\ mol/L$.

Step4: Calculate $[H^+]$ for soda

For soda with pH = 3.5, $[H^+]_{soda}=10^{-3.5}\ mol/L$.

Step5: Calculate $[H^+]$ for bleach

For bleach with pH = 13.5, $[H^+]_{bleach}=10^{-13.5}\ mol/L$.

Step6: Compare the values

Since $10^{-2}>10^{-3.5}>10^{-7.2}>10^{-13.5}$, lemon juice has the highest hydrogen - ion concentration.

Answer:

lemon juice, pH = 2