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19 December, 13:49

Determine the molarity for the fixer Sodium carbonate decahydrate (I dissolved 127.62 grams of sodium carbonate for every 4 liters of water)

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  1. 19 December, 15:04
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    0.112 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 = 127.62 g.

    molar mass = 286.138 g/mol.

    V of the solution = 4.0 L = 4000.0 mL.

    ∴ M = (mass/molar mass) solute x (1000/V of the solution) = (127.62 g / 286.138 g/mol) x (1000 / 4000.0 mL) = 0.1115 M ≅ 0.112 M.
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