Question

How many Na+ ions and OH- ions are in 1 liter of a 0.4M NaOH solution? (HINT: use Avogadro’s number).

Answer 1

Each mole of NaOH releases one mole of Na+ ions and one mole of OH- ions.
Each mole of a substance contains 6.02 x 10²³ particles

Moles of NaOH = concentration x volume
Moles of NaOH = 0.4 x 1 = 0.4

Moles of Na+ = 0.4
Ions of Na+ = 6.02 x 10²³ x 0.4 = 2.41 x 10²³

Moles of OH- = 0.4
Ions of OH- = 6.02 x 10²³ x 0.4 = 2.41 x 10²³