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7 September, 05:21

You are preparing some solutions for your instructor and have been asked to prepare 3.00 L of a 0.250M sodium hydroxide solution. To make the solution, you should weigh out: A. 30.0 g NaOH and add 3.00 L of water to it. B. 75.0 g NaOH and add water until the final solution has a volume of 3.00 L. C. 30.0 g NaOH and add water until the final solution has a volume of 3.00 L. D. 75 g NaOH and add 3.00 L water to it.

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  1. 7 September, 05:28
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    C. 30.0 g NaOH and add water until the final solution has a volume of 3.00 L.

    Explanation:

    Molarity of a substance, is the number of moles present in a liter of solution.

    M = n / V

    M = molarity

    V = volume of solution in liter,

    n = moles of solute,

    from the question,

    M = 0.250M

    V = 3.00 L

    M = n / V

    n = M * v

    n = 0.250M * 3.00 L = 0.75 mol

    Moles is denoted by given mass divided by the molecular mass,

    Hence,

    n = w / m

    n = moles,

    w = given mass,

    m = molecular mass.

    From the question,

    n = 0.75 mol NaOH

    m = molecular mass of NaOH = 40 g/mol

    n = w / m

    w = n * m

    w = 0.75 mol * 40 g/mol = 30.0 g

    Hence, by using 30.0 g of NaOH and dissolving it to make up the volume to 3 L, a solution of 0.250 M can be prepared.
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