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NaOH has a MW of 40. A 0.12M solution is made by adding how much NaOH to 100mL of water?

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    .12M solution has .12M in 1L of water.
    You have .1L of water, so you need .012M of NaOH.

    .012M * 40g/M = .48g of NaOH

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