CHEMISTRY

Determine the concentrations of Na2CO3, Na , and CO32– in a solution prepared by dissolving 2.22 × 10–4 g Na2CO3 in 2.25 L of water. Express all three concentrations in molarity. Additionally, express the concentrations of the ionic species in parts per million (ppm). Note: Determine the formal concentration of CO32–. Ignore any reactions with water.

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  1. mols Na2CO3 = grams/formal mass = ?
    L = 2.25
    M Na2CO3 = mols/L.
    (Na^+) = ? ppm
    1 ppm = 1 mg/L
    g Na^+ = 2.22E-4 x 2 = 4.44E-4 g/2.25 L = ?g/L. Convert to mg/L to obtain ppm.
    (CO3^2-) in ppm is 1/2 that.

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