Question

how many milliliters of 5M NaCl are required to prepare 1500 ml of .002M solution?
moles of solution you want? M x L = 0.002 x 1.5 L = ??
That will be the moles you need. Where do you get that? From 5 M NaCl. moles = M x L.
You know moles and M, calculate Liters and change to mL.
You can also use the formula
mL x M = mL x M
mL x 5 = 1500 x 0.002

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