Answer to Question #158255 in Chemistry for Dexther Villanueva

Question #158255

A 50.0ml sample of water containing both Ca+2 and Mg+2 is titrated with 16.54ml of 0.01104M EDTA in an ammonia buffer of pH 10. Another 50.0ml sample is treated with NaOH to precipitate the Mg(OH)2 and then titrated at pH 13 with 9.26ml of the same EDTA solution. Calculate the ppm each of CaCO3 and MgCO3 in the sample.

Expert's answer

CaCO₃: 204 ppm

MgCO₃: 135 ppm

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