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12 Nov 2019
â½ë ì¼ 210 of 850 ure Connection 52. A 0.500-g sample containing Na2CO3 plus inert matter is analyzed by adding 50.0 mL of 0.100 M HCl, a slight excess, boiling to remove CO2, and then back-titrating the excess acid with 0.100 M NaOH. If 5.6 mL NaOH is required for the back-titration, what is the percent Na CO n the sample? 53. A hydrogen peroxide solution is analyzed by adding a slight excess of standard KMnO4 solution and back-titrating the unreacted KMnO4 with standard Fe2+ solution. A 0.587-g sample of the H2O2 solution is taken, 25.0 mL of 0.0215 M KMnO4 is added, and the back-titration requires rcent H2O in the sample? (See Ex 5.26 and 5.30 for the reactions.) 54. The sulfur content of an iron pyrite ore sample is determined by converting it to H2S gas, absorbing the H2S in 10.0 mL of 0.00500 M I, and then back-titrating the excess I2 with 0.00200 M Na2S2O3. If 2.6 mL Na2S203 is required for the titration, how many milligrams of sulfur are contained in the sample? Reactions: 12 +2S,032-2S, TITER al $14.99 $1,24 55, Express the titer of a 0.100 M EDTA solution in mg BaO/ml
â½ë ì¼ 210 of 850 ure Connection 52. A 0.500-g sample containing Na2CO3 plus inert matter is analyzed by adding 50.0 mL of 0.100 M HCl, a slight excess, boiling to remove CO2, and then back-titrating the excess acid with 0.100 M NaOH. If 5.6 mL NaOH is required for the back-titration, what is the percent Na CO n the sample? 53. A hydrogen peroxide solution is analyzed by adding a slight excess of standard KMnO4 solution and back-titrating the unreacted KMnO4 with standard Fe2+ solution. A 0.587-g sample of the H2O2 solution is taken, 25.0 mL of 0.0215 M KMnO4 is added, and the back-titration requires rcent H2O in the sample? (See Ex 5.26 and 5.30 for the reactions.) 54. The sulfur content of an iron pyrite ore sample is determined by converting it to H2S gas, absorbing the H2S in 10.0 mL of 0.00500 M I, and then back-titrating the excess I2 with 0.00200 M Na2S2O3. If 2.6 mL Na2S203 is required for the titration, how many milligrams of sulfur are contained in the sample? Reactions: 12 +2S,032-2S, TITER al $14.99 $1,24 55, Express the titer of a 0.100 M EDTA solution in mg BaO/ml
Patrina SchowalterLv2
17 Feb 2019