1.A complexometric analysis of Ca2+ ion has been made to estimate the concentration of the said ion in 5.00-mL sample of milk. The sample was diluted to 100.0-mL and a 20.0-mL aliquot was taken and added with 20.0-mL 0.0500 M EDTA. About 10.0-mL of ammonia buffer and another 50.0-mL of distilled water were added in the solution. ErioT indicator was also added giving a blue color solution. After the reaction of Ca2+ and
EDTA has taken place, the excess EDTA was titrated with standard 0.0250 M MgCl2 to pink endpoint. The required volume of titrant is 11.3-mL. Calculate % Ca (40.078 g/mol).

Question

1.A complexometric analysis of Ca2+ ion has been made to estimate the concentration of the said ion in 5.00-mL sample of milk. The sample was diluted to 100.0-mL and a 20.0-mL aliquot was taken and added with 20.0-mL 0.0500 M EDTA. About 10.0-mL of ammonia buffer and another 50.0-mL of distilled water were added in the solution. ErioT indicator was also added giving a blue color solution. After the reaction of Ca2+ and
 EDTA has taken place, the excess EDTA was titrated with standard 0.0250 M MgCl2 to pink endpoint. The required volume of titrant is 11.3-mL. Calculate % Ca (40.078 g/mol).

meriam062280 · Answer

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