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12 May, 20:35

If 120 g of NaOH is dissolved in 2.5 L of water, what is the molarity of the solution?

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  1. 12 May, 21:03
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    1.2 M.

    Explanation:

    Molarity is the no. of moles of solute in a 1.0 L of the solution.

    M = n/V.

    M = (mass/molar mass) solute x (1000/V of the solution).

    mass of NaOH = 120.0 g.

    molar mass of NaOH = 40.0 g/mol.

    V of the solution = 2.5 L = 2500.0 mL.

    ∴ M = (mass/molar mass) solute x (1000/V of the solution) = (120.0 g / 40.0 g/mol) x (1000 / 2500.0 mL) = 1.2 M.
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