Ca2+ in an unknown solution of calcium carbonate (CaCO3). You titrate 50.0 mL of the unknown solution with 0.0250 M EDTA. It requires 16.85 mL of EDTA to reach the equivalence point. Determine [Ca2+] of the unknown solution, in ppm. Recall that ppm (parts per million) is equal to mg/L. Thank you!

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