Answer
The concentration of hydronium in coffee is about 39.81 times greater than in milk.
Work Step by Step
- Milk:
$[H_3O^+] = 10^{-pH}$
$[H_3O^+] = 10^{- 6.6}$
$[H_3O^+] = 2.512 \times 10^{- 7}M$
- Black coffe:
$[H_3O^+] = 10^{-pH}$
$[H_3O^+] = 10^{- 5}M$
$[H_3O^+] = 1 \times 10^{- 5}$
- Divide the coffee hydronium concentration by the milk's.
$\frac{ 1 \times 10^{-5}}{2.512 \times 10^{-7}} \approx 39.81$ times.
