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A sample of rainwater is observed to have a pH of 7.49. If only atmospheric CO2...

A sample of rainwater is observed to have a pH of 7.49. If only atmospheric CO2 at 400 ppm and limestone dust are present in the atmosphere to alter the pH from a neutral value, and if each raindrop has a volume of 0.0147 cm3, what mass of calcium (in ng) is present in each raindrop?

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