A 100.0 mL sample of water contains Mg ²⁺ and Ca ²⁺ . The first sample is titrated with 15.28 mL of 0.0016 M EDTA in pH 10 ammonium buffer. Another 100.0 mL sample is treated with NaOH to precipitate out the magnesium hydroxide and titrated in pH 13 buffer with 10.43 mL of the same EDTA solution.

Calculate the ppm of CaCO ₃ and MgCO ₃ . 

Answer rating: 100% (QA)

Solution CaCO 3 167 ppm as CaCO 3 MgCO 3 65 ppm as MgCO 3 ... View the full answer