1. While performing the Dumas experiment, if the outside of the flask were not completely dry (Part I), how would this affect the calculated molar mass of the unknown volatile liquid? Would it be higher or lower? Explain.
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1. While performing the Dumas experiment, if the outside of the flask were not completely dry (Part I), how would this affect the calculated molar mass of the unknown volatile liquid? Would it be higher or lower? Explain.
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- 1.) While performing the Dumas experiment, if the outside of the flask were not completely dry (Part I), how would this affect the calculated molar mass of the unknown volatile liquid? Would it be higher or lower? Explain. 2.) While determining the pressure during the Dumas experiment, if the barometric pressure reported were lower than the actual vapor pressure (Part I), how would this error affect the calculated molar mass of the unknown volatile liquid? Explain. 3.) While determining the volume during this experiment (Part II), if the total volume of the flask were incorrectly reported as 125 mL, how would this error affect the calculated molar mass of the unknown volatile liquid? Explain. 4.) Calculate the number of moles of Argon gas contained in a 4.00 dm3 container at 620. kPa and 25.0 oC. If the gas is Helium instead of Argon, will the answer change? Explain. 5.) In the Dumas method for determining the molar mass of an unknown volatile liquid, a sample of a volatile liquid…1. The heat flows measured in this experiment were actually not for the simple neutralization of a proton and hydroxide ion (as indicated in the Introduction for Choice Ill); rather they include contributions based on the fact that these species are hydrated in aqueous solution. What does it mean to say that a proton is hydrated, and how will the heat of hydration affect the measured heat flow for a neutralization reaction?b. The flask is removed from the hot water bath while liquid remains. c. The volume in the flask occupied by the stopper was not accounted for when the volume of the flask was measured. 4. What affect on the molar mass would occur if twice the experimental volume of volatile liquid was placed in the flask at the beginning of the experiment? 5. Would this experiment be practical if the unknown had a boiling point of 130°C?
- If you did not completely dry the Erlenmeyer flask before weighing the result, how would that affect the final results? Be specific in your answer.What do you call the type of analytical method that relies on the absolute stoichiometric equivalences of balanced chemical reactions in order to compute the amount of analyte present in the sample? a.Oxidative methods b.Classical methods c. Blank Correction Methods d. Instrumental methodsColumn Chromatography of 9-Fluorenone Experiment Introduction: Column chromatography is an important chromatography method used to separate and purify organic compounds. Column chromatography is typically used to separate impurities and purify products from chemical reactions, including separating unused starting material from products. Column chromatography is very similar to Thin Layer Chromatography (TLC) because it relies on a solid stationary phase (absorbent) and liquid mobile phase (eluant) to separate organic compounds based on their different polarities. In column chromatography, the stationary phase is a solid absorbent, typically silica gel or alumina, with a liquid coating packed into a glass column. The stationary phase is typically very polar. An eluant (mobile phase) solvent travels down the column and the separation occurs as the organic compounds enter into equilibria with the stationary and mobile phases. The polarity of the eluant may be adjusted from non-polar…
- If you do not heat your crucible strongly enough to remove all volatile impurities when you heat the crucible empty, what will be the result if those impurities are completely volatilized when heating your sample?3) What would happen to the values you calculated for Kc in the experiment if the Beer's Law constant (k) value you used was high (e.g. you used 6,000 M²' when the actual constant had a value of 5,000 M-')? Explain your answer.1. Several procedures for the analysis of caffeine involve extracting the caffeine into an organic non-polar solvent (such as methylene chloride CH2Cl2). This about your experiment and what is discussed in the introduction. What might the advantage be for this approach? What is a disadvantage? 2. Think about what you said in the question above. If your sample was espresso, would your answer change? Why? 3. I was careless and ended up using a wavelength other than the peak (Say 250 nm). Would I still be able to carry out the experiment successfully? What might be the reason that I do not get optimum results? 4. I carried out the experiment using a scratched (or several scratches) cuvet for one standard, and clear cuvets for others. How might my calibration curve change (improve or get worse and why)? Pllllz answer these questions as soon as possible
- Q2. What does “crude” product mean? Q3. What is the advantage of using Buchner filtration in filtering crystals? Q4. Briefly explain how scratching the wall of the glass flask can help formation of crystals. Q5. Briefly explain why crystals form as the solvent cools during recrystallization.What are the assumptions necessary to be made in order to determine the molecular weight of a volatile substance using the Dumas method?Specify whether the calculated mass percent of water would be too high, too low, or unchanged as a result of each of the following experimental conditions. Justify your answers. a. The heating was insufficient to remove all of the water from the hydrated salt. b. Some of the sample spattered out of the crucible onto the laboratory bench during the heating.