How do you calculate the number of ions in a solution?

The concentration of ions in solution depends on the mole ratio between the dissolved substance and the cations and anions it forms in solution. Consider a compound that dissociates into cations and anions, the minimum concentration of each of those two products will be equal to the concentration of the original compound.

For example: Na2SO4(aq) → 2Na+ (aq) + SO24(aq)

The mole ratio between Na2SO4 and Na+ is 1:2, which means that 1 mole of the former will produce 2 moles of the latter in solution.

the concentration of the Na+ ions will be

1.0 M⋅ 2 moles Na+/1 mole Na2SO4 = 2.0 M

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