A 0.2 g sample of NazC204 consumed 30.92 mL of KMNO4 to reach the faint pink endpoint in the standardization of KMNO4 solution. This standardized solution was used to analyze the calcium in a milk sample (density = 1.21 8/mL) by permanganimetry. A 5.9 mL of the milk sample was diluted to 250.0 mL, and a 25.00 mL aliquot was treated with (NH4)2C2O4 to precipitate calcium as CaC204•H20. Digestion, filtration and addition of acid followed and during titrationm 20.01 mL of standardized KMNO4 was consumed. Calculate the % Ca (W/w) of the milk sample analyzed. Express your answer in 2 decimal places. No need to include the unit. MM (g/mol): NazC204 = 134 ; Ca = 40.08 Pertinent redox reactions: NażC2O4 + 2H3O* – H2C204 + 2H2O + 2Na* 2MNO4“+ 5H2C2O4 +6H3O* → 2MN2- + 10CO2 + 14H20 Caco3 + 2H30* → Ca2* + CO2(g) + 3H2O Ca2* + C2042 + H20 → CaC204+H2O3) CaC204*H2O(s) + 2H3O* → Ca2* + H2C204+ H2O Round your answer to 2 decimal places.
A 0.2 g sample of NazC204 consumed 30.92 mL of KMNO4 to reach the faint pink endpoint in the standardization of KMNO4 solution. This standardized solution was used to analyze the calcium in a milk sample (density = 1.21 8/mL) by permanganimetry. A 5.9 mL of the milk sample was diluted to 250.0 mL, and a 25.00 mL aliquot was treated with (NH4)2C2O4 to precipitate calcium as CaC204•H20. Digestion, filtration and addition of acid followed and during titrationm 20.01 mL of standardized KMNO4 was consumed. Calculate the % Ca (W/w) of the milk sample analyzed. Express your answer in 2 decimal places. No need to include the unit. MM (g/mol): NazC204 = 134 ; Ca = 40.08 Pertinent redox reactions: NażC2O4 + 2H3O* – H2C204 + 2H2O + 2Na* 2MNO4“+ 5H2C2O4 +6H3O* → 2MN2- + 10CO2 + 14H20 Caco3 + 2H30* → Ca2* + CO2(g) + 3H2O Ca2* + C2042 + H20 → CaC204+H2O3) CaC204*H2O(s) + 2H3O* → Ca2* + H2C204+ H2O Round your answer to 2 decimal places.
Chapter11: Properties Of Solutions
Section: Chapter Questions
Problem 109AE: Patients undergoing an upper gastrointestinal tract laboratory test are typically given an X-ray...
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