You are provided a 40g/L stock solution to make 2L of a 0.0032g/mL KCl solution. To make this solution you will need
2 L * 0.0032 g /mL * 1000 mL / L = 6.4 g KCl
6.4 g KCl * 1 L / 40g = 0.16 L = 160 mL of stock solution
Rest should be water : 2000 mL - 160 mL = 1840 m water
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