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14 March, 19:30

A solution which is 38.0% w/w in k2cro4 has a specific gravity of 1.37. calculate the concentration in terms of molarity of chromate ion.

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  1. 14 March, 19:48
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    When in aqueous solution, K2CrO4 dissociates into ions. It dissociates into:

    K2CrO4 = 2K+1 + CrO4-1

    We do as follows:

    Molarity = mol / L = 0.38 g/g solution (1.37 g/mL) (1 mol / 194.19 g) (1 mol CrO4-1 / 1 mol K2CrO4) (1000 mL / 1 L) = 2.68 M
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