In an analytical laboratory that analyzes BOD, the titrant solution of sodium thiosulphate must be standardized every 3 days. The standardized concentration can be determined with the help of standard potassium dichromate solution. This is an oxidation and reduction, as well as "Iodometric reaction". The reactions of the process are: 6 Kl + 14 HCl + K2Cr2O7 -->2CrCl3 + 3I2 + 7 H2O + 8 KCl 2 Na2S2O3 + I2 --> Na2S4O6 + 2 NaI Given the standardization data in the table below, determine the missing value as indicated by the question mark (?). Please answer and don't reject the question, thank you so much! Number of Observation Volume of 0.1065 M K2Cr2O7, mL Volume of Na2S2O3 used to titrate K2Cr2O7, mL Standardized concentration of Na2S2O3, M 1 10.0 6.65 ? 2 10.0 7.10 ? 3 10.0 6.80 ? 4 10.0 7.00 ? Mean: ? ? Standard deviation: ? ?
In an analytical laboratory that analyzes BOD, the titrant solution of sodium thiosulphate must be standardized every 3 days. The standardized concentration can be determined with the help of standard potassium dichromate solution. This is an oxidation and reduction, as well as "Iodometric reaction". The reactions of the process are: 6 Kl + 14 HCl + K2Cr2O7 -->2CrCl3 + 3I2 + 7 H2O + 8 KCl 2 Na2S2O3 + I2 --> Na2S4O6 + 2 NaI Given the standardization data in the table below, determine the missing value as indicated by the question mark (?). Please answer and don't reject the question, thank you so much! Number of Observation Volume of 0.1065 M K2Cr2O7, mL Volume of Na2S2O3 used to titrate K2Cr2O7, mL Standardized concentration of Na2S2O3, M 1 10.0 6.65 ? 2 10.0 7.10 ? 3 10.0 6.80 ? 4 10.0 7.00 ? Mean: ? ? Standard deviation: ? ?
General Chemistry - Standalone book (MindTap Course List)
11th Edition
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Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
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Chapter17: Solubility And Complex-ion Equilibria
Section: Chapter Questions
Problem 17.15QP: Solubility and Solubility Product You put 0.10-mol samples of KNO3, (NH4)2S, K2S, MnS, AgCl, and...
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In an analytical laboratory that analyzes BOD, the titrant solution of sodium thiosulphate must be standardized every 3 days. The standardized concentration can be determined with the help of standard potassium dichromate solution. This is an oxidation and reduction, as well as "Iodometric reaction". The reactions of the process are:
6 Kl + 14 HCl + K2Cr2O7 -->2CrCl3 + 3I2 + 7 H2O + 8 KCl
2 Na2S2O3 + I2 --> Na2S4O6 + 2 NaI
Given the standardization data in the table below, determine the missing value as indicated by the question mark (?). Please answer and don't reject the question, thank you so much!
| Number of Observation | Volume of 0.1065 M K2Cr2O7, mL | Volume of Na2S2O3 used to titrate K2Cr2O7, mL | Standardized concentration of Na2S2O3, M |
| 1 | 10.0 | 6.65 | ? |
| 2 | 10.0 | 7.10 | ? |
| 3 | 10.0 | 6.80 | ? |
| 4 | 10.0 | 7.00 | ? |
| Mean: | ? | ? | |
| Standard deviation: | ? | ? |
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