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1 August, 07:52

You complete a titration and find that you need 2.5 mL of a 0.1M NaOH to neutralize 250 mL of

the river water.

How many moles of NaOH did you use to neutralize the river water?

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  1. 1 August, 08:28
    0
    0.00025 mole

    Explanation:

    The number of moles of a substance can be mathematically derived from the following formula

    1. mass of substance (in grams) / molar mass of substance (in grams/mole)

    2. molarity of substance (in mol/dm3) x volume of substance (in dm3)

    In this case, the molarity and volume of NaOH are provided, hence, the second formula will be applicable.

    2.5 mL of NaOH was used = 0.0025 dm3

    Number of mole of NaOH that was used to neutralize the river water:

    = 0.1 x 0.0025 = 0.00025 mole

    The number of mole of NaOH used to neutralize the river water is 0.00025 mole.
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