based on the concentration determined for the KCN stock solution calculate volume required to prepare 1 L of a 10 mg CN/mL solution. Dilute with the NaOH dilution solution. Dilute 10 mL of the 10 mg CN/mL solution to 100 mL with the NaOH dilution solution; 1.0 mL = 1.0 mg CN. Prepare fresh daily and keep in a glass-stoppered bottle.