J.R. S. answered 05/14/21
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V1M1 = V2M2
V1 = initial volume = ?
M1 = initial concentration = 17.5 M
V2 = final volume = 500 ml
M2 = final concentration = 2.5 M
(x ml)(17.5 M) = (500 ml)(2.5 M)
x = 71.4 mls