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Calculate the mass of unknown solid required to prepare 100 mL of a solution that is 100 ppm in Ca by assuming that the sample contains 50 wt% CaCO3.

Calculate the mass of CaCO3 required to prepare 500 mL of a standard solution that is 100 ppm in Ca2+.

Calculate the mass of NaCl required to prepare 500 mL of a standard solution that is 100 ppm in Na+

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