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Column Chromatography Question
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- Isopropanol and water are miscible, meaning they can be combined in any ratio. So why were they immiscible in this experiment? In other words, why does the presence of sodium chloride reduce the solubility?What is the effect of prolonged digestion in gravimetric analysis?What, if any, impact is using drops instead of specific volumes has on the experiment?
- 25. In the paper chromatography experiment on food dyes, salt water was used as the A. mobile phase B. stationary phase C. eluent D. solute E. sample spotsEach compound of the solute mixture is adsorbed with different forces, which causes it to move over the stationary phase at different speeds, this is known as: a.adsorption effect b. solvent flow rate C. partition effectIf a mixture is distilled rapidly, the separation of its compound is poorer than if the mixture is distilled slowly. Please explain why is that so using your own understanding. I don't need a copy-pasted answer from google.
- Stoichiometry: Prolonged exposure of some functionalities to the eluent (methanol) in this experiment may lead to undesirable reactions. In one case, Acetylsalicylic acid (Aspirin) can react with methanol to form salicylic acid and methyl acetate. If 800 mg of Acetylsalicylic acid and 1 mL of Methanol undergoes such a side reaction (known as "Methanolysis") to completion: (a) write a balanced equation (draw all molecules instead of writing chemical formulas), (b) what is the limiting reagent? (c) predict the grams of salicylic acid and methyl acetate to be produced in this process. Show calculations. Hint: you can determine the grams of 1 mL of Methanol through its density.Column 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…In an extraction procedure, it is advisable to: O put the aqueous layer down the drain put the organic layer in the aqueous waste throw away all layers as soon as you have extracted them save all layers until an experiment is complete
- 3. What is particulate gravimetry? When do we use this technique? 4. What are the conditions for a successful gravimetric analysis. 5. Define nucleation. What conditions are important for this stage.Assume the data below was collected for two different sample solutions using the same experimental procedure you carried out. Based on the two lines shown below, which solution (orange data points or blue data points) corresponds to the sample with the higher molar absorptivity? 0.9 y4.771 - 0.0728 0.7 0.6 04 0.3 02 y1414 - 0.0546 R0.99642 0.1 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 02 0.1 [Concentration, M] orange data points (lower line) O blue data points (upper line) AbsorbanceCompute for the numerical value of the gravimetric factor required to convert the given precipitate into the desired analyte. 1. Magnesium ammonium phosphate (MgNH4PO4) precipitate into phosphorous (as diphosphorous pentoxide, P2O5). 2. Magnesium ammonium phosphate hexahydrate (MgNH4PO4.6H2O) precipitate into nitrogen.