use dilution formula
M1*V1 = M2*V2
1---> is for stock solution
2---> is for diluted solution
Given:
M1 = 15 M
M2 = 0.85 M
V2 = 250 mL
use:
M1*V1 = M2*V2
V1 = (M2 * V2) / M1
V1 = (0.85*250)/15
V1 = 14.2 mL
Answer: 14.2 mL
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