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9 May, 11:42

What is the molarity of a solution that contains 15.0g of naoh per 500.0 ml of solution

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Answers (1)
  1. 9 May, 13:52
    0
    0.4 M

    Explanation:

    Molarity is defined as moles of solute, which in your case is sodium hydroxide,

    NaOH

    , divided by liters of solution.

    molarity

    =

    moles of solute

    liters of solution

    Notice that the problem provides you with the volume of the solution, but that the volume is expressed in milliliters,

    mL

    .

    Moreover, you don't have the number of moles of sodium hydroxide, you just have the mass in grams. So, your strategy here will be to

    determine how many moles of sodium hydroxide you have in that many grams

    convert the volume of the solution from milliliters to liters

    So, to get the number of moles of solute, use sodium hydroxide's molar mass, which tells you what the mass of one mole of sodium hydroxide is.

    7

    g



    1 mole NaOH

    40.0

    g

    =

    0.175 moles NaOH

    The volume of the solution in liters will be

    500

    mL



    1 L

    1000

    mL

    =

    0.5 L

    Therefore, the molarity of the solution will be

    c

    =

    n

    V

    c

    =

    0.175 moles

    0.5 L

    =

    0.35 M

    Rounded to one sig fig, the answer will be

    c

    =

    0.4 M
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