How much 2.0 M NaCl solution would you need to make 250 mL of 0.15 M NaCl solution?

18.75 mL

Explanation:

(M1)(V1)=(M2)(V2)

(2.0 M)(V1)=(0.15 M)(250 mL)

(2.0)(V1)=37.5

Divide 2.0 on both sides

V1=18.75 mL

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explanation:

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.