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7 June, 11:28

How many grams of naoh are needed to make 750 ml of a 2.5 (w/v) solution?

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  1. 7 June, 14:23
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    Concentration: 2.5% w/v

    Concentration w/v % = [mass of solute / volume of solution ] * 100

    => mass of solute = concentration w/v * volume of solution / 100

    => mass of solute = 2.5 * 750 ml / 100 = 18.75 grams

    Also, using proportions you get to the same result:

    2.5% w/v = > 2.5 grams of NaOH / 100 ml of water

    => 2.5 grams of NaOH / 100 ml water = x grams of NaOH / 750 ml water

    => x grams of NaOH = 750 ml water * 2.5 grams of NaOH / 100 ml water

    => x = 18.75 grams of NaOH

    Answer = 18.75 grams of NaOH
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