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What is the mass in grams of FeSO4 that can dissolve in a 1 litre solution...

What is the mass in grams of FeSO4 that can dissolve in a 1 litre solution that is .050 M Carbonic Acid and .25 M Sodium Bicarbonate, before Iron (II) Hydroxide begins to precipitate?

Ka H2CO3 = 4.5e-7

Ksp Fe(OH)2 = 2e-15

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