Question

Several substances are labeled on the pH scale below.

A p H scale is shown ranging from 0 the top to 14 at the bottom. The approximate locations of substances are: gastric fluid, 1.2; lemon juice, 2.2; milk, 6.5; blood, 7.5; seawater, 8; milk of magnesia, upper M g (upper O upper H) subscript 2 solution, 10.5; household lye, upper N a upper O upper H solution, 13.5.

Which substance has the lowest [H+] concentration but is still considered an acid?
milk
blood
gastric fluid
household lye

Answer 1

Milk.

Reason: pH measures [H+], with higher pH = lower [H+]. Milk has pH ≈ 6.5, still acidic (<7) but higher than gastric fluid (1.2), so it has the lowest [H+] among the acids listed.