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A water sample was taken from a lake. A 100.00mL portion of this sample was pipetted into a 250mL Erlenmeyer flask. EriochromeBlack T-indicator, sodium cyanide, and ammonia buffer were also added to the flask. It required 24.24 mL of 0.0150M EDTA to reach the equivalence point of the titration. What is the molarity of hardness ions in the lake's water?

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