How many milliliters of a 14 M NH3 stock solution are needed to prepare 200 mL of a 4.2 M dilute NH3 solution
M1 = 14M , V1 = ? , M2 = 4.2M , V2 = 200 mL
M1V1 = M2V2
14M ×V1 = 4.2M × 200mL
V1 = 60 mL
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