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- 1. Why is it necessary to use a buret for measuring standard AgNO3 solution in volhard method? 2. What is the effect of discolored AgNO3 on the concentration of KSCN? 3. Why is necessary to use boiled 6N HNO3 in volhard? 4. why is the titration done with vigorous swirling? 5. A solution of AgNO3 is added to a solution containing 0.100 Cl- and 0.100M CrO4-, at what Ag+ concentration will Ag2CrO4 begin to precipitate? and what will be the concentration of the less soluble compound when the more soluble one begins to precipitate?Guide Questions[1] What type of precipitate is BaSO4?[2] Why is filter paper preferred over a sintered glass filter?[3] What made an ashless filter paper ashless?[4] Why is a porcelain crucible used in this procedure?[5] Why do we need to precipitate from a hot solution?[6] Why is the precipitating agent added all at once?[7] What is the purpose of adding 6M HCl in the sample solution?[8] Why do we need to test the washings with AgNO3?[9] What is ignition?[10] What is the product after the precipitate was ignited?[11] What are the advantages of performing ignition?[12] Cite the sources of errors for this experiment and how to circumvent these problems.1.What is the significance when KD is either a small or large value? 2. Methyl alcohol and ethyl alcohol are poor extraction solvents. Why?3. What is the major disadvantage of using ether as an extracting solvent?
- What is the purpose of adding CaCO3 or NaHCO3 in the Mohr Method determination of chloride?Which of the following is true for EDTA solution? A. It always needs to be adjusted (it needs to be standardized). B. Primer adjusted (standardized) against MgSO4 solution C. Primer is adjusted (standardized) against NaCl solution D. Needs to be set immediately after preparationFor a Kjeldahl analysis: you weighed 0.0312 g unknown dried blood sample and digested it with concentrated H2SO4. After the distillation into boric acid solution, Methyl Purple indicator changed its color to green. During titration with 0.0110 M H2SO4 it took 15.35 mL of this H2SO4 solution to bring the color of the mixture to grey-blue. a) What number of moles of H2SO4 reacted? b) What number of moles of boric acid reacted with NH3 during distillation? c) What number of moles of NH3 was produced during distillation? d) What was mass of N in the produced NH3? e) What is %N w/w in the original sample?
- 1. Complete and turn in the Data and Calculations page for this experiment. Include calculations for the determination of the exact concentration of your group’s EDTA solution, and the Ca2+ ion concentration (in M) and the hardness (in ppm CaCO3) of yourunknown water sample. Organize and label your calculations and report all measurementsand calculations with the correct number of significant figures.2. How would you characterize the precision of your experimental measurements in this lab?Is the level of precision reasonable or unreasonable? Explain your answer. Data and Calculations PageRecord all of your group’s experimental data below. Carry out and include all of the calculations needed to determine the Ca2+ ion concentration (in M) and the hardness of your unknown water sample (in ppm CaCO3). Attach additional pages as needed.After completing the synthesis and purification of 4-t-butylcyclohexene, a few drops of the product were mixed with 1 drop of NaOH and 3 drops of KMnO4, as shown in the image. Identify with the name and structure of the brown precipitate (sediment, sludge) shown in the imagePlease help me calculate the theoretical yield of [Ru(phen)3)][PF6]2 as seen in the procedure below!
- What is the purpose of performing a blank titration in the assay of ibuprofen? A. To determine the amount of titrant that would react with the indictor. B. To determine the amount of titrant that would react with ibuprofen. C. To determine the amount of titrant that would react with potassium hydrogen phthalate. D. To determine the amount of titrant that would react with free acid in the solvent.If i cannot use ammonia water, what can i use as a substitute to make my acid supernatant to be an alkaline? After being macerated with 95% ethanol and dissolved in 5% acetic acid, I got an acid supernatant and I was supposed to use ammonia water along with dichloromethane but the ammonia water was disregarded due to specific reasons. What can I replace my ammonia water with to make my acid supernatant an alkaline?After a crude product is dissolved in 1.5 mL of hot solvent, the resulting solution is dark brown. Because the pure compound is reported in the literature to be colorless, it is necessary to perform a decolorizing procedure. Should you use pelletized Norit or powdered activated charcoal to decolorize the solution? Explain your answer.