Verified Answer :

kimeto3

The formula to use is M₁V₁=M₂V₂
We are trying to find V₁ so V₁=M₂V₂/M₁
                                          =250X1.2 /3
                                          =100mL

M1V1=M2V2
(3)(V1)=(250)(1.2)
V1=100 mL

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