Question

PH at the start of yogurt incubation PH6.5 and after 8 hours PH4.4. Using each pH value, calculate the concentration of protons and number of protons in 1L of milk.

time 0
PH 6.5
protons concentration 3.16x10^-7
number of protons in 1L of milk?

time 8
PH 4.4
protons concentration 3.98x10^-5
number of protons in 1L of milk?

Thanks

Answer 1

6.5 = -log(H^+)
(H^+) = 3.16E-7 M = 3.16E-7 mols/L
There are 6.02E23 ions in a mole of ions; therefore,
3.16E-7 mols x 6.02E23 ions/mol = ? H^+.
pH 4.4 is done the same way.