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Answer
The given sloppy separation of PbSO4 is determined by electrochemical series only one metal Zn+2 ion can separate, Zn+2 ion has high reduction potential than Pb+2
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- 5. A 300.0 mg sample containing Na,CO3, NaHCO3 and NaOH and inert material either alone or in some combination was dissolved and titrated with 0.1000 M HCI the titration required 24.41 mL to reach the phenolphthalein endpoint. And an additional 8.67 mL to reach the methyl red endpoint. Determine the composition of the sample and calculate the percent of each titrated component.Complex Ion Formation and Precipitation Reactions i. A 1-L water sample was submitted for determination of chloride ion. 100.00mL the sample was analyzed using the Volhard method. 50.00 mL of 0.0929N AgNO3 was added to the sample and was back titrated with 12.50mL of 0.0510N KSCN solution to reach the end point. Find ppm Cl- in the water sample. ii. Using Mohr method, the chloride content of a mineral water was determined. 50.00mL of the sample was titrated with 10.80mL of 0.05N AgNO3 solution to reach end point. Determine the concentration of Cl- in ppm. iii. Calculate the hardness of a water sample such that 100.00mL of the sample required 35.00mL of 0.1051M EDTA solution to reach the end point.Concentration sodium thiosulfate solution used: 0.056 mol L-1 ACCURATE TITRATION VOLUME OF SODIUM THIOSULFATE SOLUTION USED Volume titration 1, (ml) Volume titration 2, (ml) Your Group 15.80 15.75 Group 1 16.05 15.70 Group 2 16.30 16.25 ANALYSIS Average volume used, (mL) Standard deviation Number of moles sodium thiosulfate used, (mol) Number of moles calcium iodate in solution, (mol) Volume of calcium iodate used, (mL) Concentration of saturated calcium iodate solution (mol L-¹) Unrounded value 15.9750 0.26220 Rounded value 15.97 0.262 10.0
- Concentration sodium thiosulfate solution used: 0.056 mol L-1 ACCURATE TITRATION VOLUME OF SODIUM THIOSULFATE SOLUTION USED Volume titration 1, (mL) Volume titration 2, (mL) Your Group 15.80 15.75 Group 1 16.05 15.70 Group 2 16.30 16.25 ANALYSIS Average volume used, (ml) Standard deviation Number of moles sodium thiosulfate used, (mol) Number of moles calcium iodate in solution, (mol) Volume of calcium iodate used, (mL) Concentration of saturated calcium iodate solution (mol L-¹) Unrounded value 15.9750 0.26220 0.00089400 0.00036700 A Rounded value 15.97 0.262 8.94 x 10-4 10.0 Minimize4. To perform a certain activity assay it is necessary to have 0.25 mL of an enzyme at a concentration of 0.2 mgml¹ in the presence of 0.4 mM substrate and 200 mM NaCl in a suitable buffer. The stock solutions of enzyme, substrate and NaCl are 4 mgmL-¹, 40 mM and 1 M all in the same type of buffer. What volumes of the stock solutions and buffer are required for each assay?In a Complexometric Titration Experiment, the preparation of the EDTA solution is as follows: In a 250 mL beaker, weigh 0.10 g MgCl2*6H2O and 1.0 g NaOH. Add approximately 200 mL distilled water and stir to dissolve. Add about 2.0 g of EDTA and transfer the solution quantitatively to a 1-L volumetric flask. Dilute to the mark with distilled water. What is the purpose of adding MgCl2*6H2O? Please show COMPLETE solution.
- 6. The mass percent of KHP in an unknown salt sample was determined using both volumetric and gravimetric titration. Ten determinations using each method were performed: (You should be using Excel to solve for the required values) Volumetric (% KHP): 34.22 33.86 34.07 34.49 34.69 33.71 34.28 34.11 34.26 34.10Gravimetric (% KHP): 34.35 34.26 34.10 34.19 34.18 34.32 34.11 34.33 34.17 34.12 a) Do the two methods give similar standard deviations? b) Do the two methods give similar results for the mass percent of KHP at the 95% confidence level?A student performed three CH₂Cl₂ layer titrations in Part 2 using a standard sodium thiosulfate solution with a concentration of 0.01154 M. They reported the following measurements: Final CH₂Cl2 Layer Burette Reading Initial CH₂Cl₂ Layer Burette Reading Final Thiosulfate Burette Reading Initial Thiosulfate Burette Reading Determination #1 19.86 mL 12.44 mL 28.88 mL 1.23 mL Determination #2 27.53 mL 19.86 mL 29.22 mL 1.44 mL Determination #3 35.01 mL 27.53 mL 29.02 mL 1.18 ML How many moles of iodine did they use in their first titration (ie. their first determination)? Report your answer to the correct number of significant figures and only report the numerical value (no units).A 370.00 mL solution of 0.00190 M AB5 is added to a 200.00 mL solution of 0.00165 M CD2. What is pQsp for AD5?
- A student performed three CH₂Cl2 layer titrations in Part 2 using a standard sodium thiosulfate solution with a concentration of 0.01153 M. They reported the following measurements: Final CH₂Cl2 Layer Burette Reading Initial CH₂Cl2 Layer Burette Reading Final Thiosulfate Burette Reading Initial Thiosulfate Burette Reading Determination #1 25.68 mL 17.59 mL 27.87 mL 0.24 mL Determination #2 32.27 mL 25.68 mL 23.88 mL 0.41 mL Determination #3 40.05 mL 32.27 mL 26.78 mL 0.22 mL How many moles of iodine did they use in their second titration (ie. their second determination)? Report your answer to the correct number of significant figures and only report the numerical value (no units).5. A 300.0 mg sample containing Na,CO3, NaHCO, and NaOH and inert material either alone or in some combination was dissolved and titrated with 0.1000 M HCI the titration required 24.41 ml to reach the phenolphthalein endpoint. And an additional 8.67 mL to reach the methyl red endpoint. Determine the composition of the sample and calculate the percent of each titrated component.7. In the titration of 100 ml of acetic acid with VT.O N NAOH, the following relative con- đuctance readings were observed for the corresponding burette readings. What is the concentration of the acid? 0.00 ml = 0.22 0.10 ml = 0.19 1.60 ml = 1.47 %3D 1.80 ml = 1.73 %3D 0.20 ml = 0.23 2.00 ml = 2.21 0.40 ml 0.39 2.20 ml - 2.71 %3D %3D 2.40 ml = 3.21 2.60 ml = 3.70 0.60 ml = 0.56 = 0.74 0.92 0.80 ml 1.00 ml 3.00 ml = 4.70 %3D 1.20 ml = 1.10 3.40 ml 5.69 1.40 ml 1.28 %3D
