PART A:
What is the pH of an aqueous solution with [H3O+] =
4×10?13M ?
PART B:
Carbonated cola is more acidic than coffee or even orange juice
because cola contains phosphoric acid.
What is the molar concentration of H3O+ in a cola that has a pH
of 3.120?
PART C:
Rank from most to least acidic. To rank items as equivalent, overlap them. pH = 10 Most acidic Least acidic
Answer
PART A :
pH = -log[H3O+]
pH = -log[4 x 10-13M]
pH = 12.4
PART B
Molar concentration of H3O+
=10-pH
= 10-3.120
Molar concentration of H3O+ = 7.6 x
10-4
PART C
pH = -log[H3O+] = -log[10-2]=
2
pH = -log[H3O+] = -log[10-4]=
4
Therefore the order is
Most acidic
[H3O+] = 10-2
pH = 3
pH = 3.5
[H3O+] = 10-4
Least Acidic
pH =10 is basic