If the volume of edta needed to reach the endpoint was 269, Chemistry

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If the volume of edta needed to reach the endpoint was 269

Formula weight of EDTA is 372.2 g/mole and the formula weight of CaCO3 is 100.09 g/mole. If the volume of EDTA needed to reach the endpoint was 26.9 mL in trial one, 27.3 mL in trial two and 26.4 mL in trial three, what is the hardness of the water in ppm + 95% confidence limit?

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Chemistry: If the volume of edta needed to reach the endpoint was 269

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