(Answered) Adding 100 ml of a dilute solution of zinc nitrate to 246

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Adding 10.0 mL of a dilute solution of zinc nitrate to 246 mL of 2.00 M sodium sulfide produced 0.279 g of a precipitate.

What was the concentration of each ion in the original solutions?

What is the concentration of the sulfide ion in solution after the precipitation reaction, assuming no further reaction?

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