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PPM -- Gravimetric Analysis A 254.1-g sample of ground water is analyzed for calcium. The Ca2+ in the sample is first precipitated and filtered-off as

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PPM -- Gravimetric Analysis A 254.1-g sample of ground water is analyzed for calcium. The Ca2+ in the sample is first precipitated and filtered-off as NH4CaPO4.7H20. This precipitate is dried and heated, releasing water and ammonia to yield anhydrous calcium pyrophosphate (Ca2P207). The mass of Ca2P207 obtained is 0.0731 g. Give the calcium content of the ground water in parts per million (to three significant figures). ppm

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