Molarity = number of moles X (1000/volume)
number of moles of SCN⁻ = 0 .001 X 3 / 1000 = 3 X 10⁻⁶ moles in the 25 ml of solution
2) SCN⁻ + Fe³⁺ ===> FeNCS²⁺
1 mole SCN⁻ produces 1 mole of FeNCS²⁺
Therefore moles of FeNCS²⁺ in 25 ml = 3 X 10⁻⁶
Molar Concentration of FeNCS²⁺ = (3 X10⁻⁶ )X 1000 / 25 = 1.2 X 10⁻⁴ Moles / liter
