Pre-lab 2

1. Explain how distillation works in separating simple mixtures. 2. Differentiate simple distillation and fractional distillation. 3. What is an effective way of preventing irregular ebullition or bumping of the mixture during distillation?

12. Answer Only Refer to the following mixtures: Mixture A: Liquid and solid mixture Mixture B. Liquid mixture whose boiling points are similar. Mixture C. Liquid mixture with high boiling point. Mixture D. Heat sensitive liquid mixture. Which of the following distillation can be applied for Mixture D? vacuum distillation fractional distillation simple distillation none of these ———— This is defined as the temperature at which the vapor pressure of the liquid phase of a compound equals the external pressure acting on the surface of the liquid. solubility melting point boiling point flash point optical rotation —————— Predict the color change if 1% ferric chloride (yellowish solution) is added to a test tube containing a mixture of ethanol and pure acetyl salicylic acid. purple to yellow yellow to dark blue light blue to pink yellow to purple no color change

1. Solubility Test Table 1. Results for the solubility test. OBSERVATION* INFERENCE SAMPLE Ethyl acetate ** Нехаne Methanol Water Coconut oil Vitamin E Beef fat Miscible (soluble) or immiscible (insoluble) ** polar or nonpolar Sudan IV Test Table 2. Results for Sudan IV test. OBSERVATION* INFERENCE SAMPLE Нехаne Ethyl acetate Methanol Water ** Coconut oil Vitamin E Beef fat Homogeneous or heterogeneous mixture ** polar or nonpolar

Help please

Professor X mixed two solutions in a test tube and observed that the mixture was warm. He also tried to mix 50-ml each of the solutions in a 100-ml volumetric flask and found out that the total volume was less than 100 ml. He only has water, methanol, ethanol, and acetone in his table. From the following choices, what solutions did Professor X mix?   a.acetone and water b.water and methanol c.acetone and ethanol d.methanol and ethanol

B. Complete table 1. Write down your observations Solubility in Substance/Sample Miscible/Immiscible *Solubility in References for Water hexane column 4 1 Cooking Oil 2 Sunflower oil 3 Olive oil 4 Margarine 5 Butter * Since you were not able to conduct an actual experiment on the solubility of your lipid samples in hexane, kindly get this information in textbooks, research articles or other references.

What is fractional distillation and distillation with the use of a fractionating column; how it is performed, what is the theory behind it?

6. Suppose you have a mixture of water and your 2-bromo-2-methylbutane product in a separatory funnel. Use densities to predict which phase will be the top layer in the funnel. a. 2-bromo-2-methylbutane (organic phase) b. water (aqueous phase) c. there would only be one phase since the substances are miscible

Can you help me understand how to get the dilution factors for each tube, please?

Please answer the question at the bottom. Fractional distillation  Measure 55 mL of 40% ethanol  Place 50 mL of ethanol in your distilling flask taking care that no liquid enters the side arm.  Place the remaining 5 mL of ethanol in a test tube and set aside for procedure 2.  Add a few marble or porcelain chips to the distilling flask to prevent bumping. Bumping is a term given to irregular boiling  Assemble the rest of the apparatus for a simple distillation set-up. You may ask assistance from your instructor  Cover the top of the distilling flask with a cork fitted with a thermometer. Make sure that the tip of the thermometer bulb is just below the side arm of the distillation flask  Check all connections for tightness  Heat the contents of the flask to boiling. Adjust the flame when the sample is already boiling. Make sure that it does not boil to dryness.  Note the temperature of the first drop.  Collect 60 drops of distillate per test tube. You will need 5 test tubes, thus five…

50 mL of stock solution were taken and added to flask. Then 50 mL of Di water were added to the flask. This is solution 1. Then 50mL of solution 1 were taken and added to a flask and 50 mL of Di water were added to the flask. This is solution 2. Then 50mL of solution 2 were taken and added to a flask and 50 mL of Di water were added to the flask. This is solution 3. Then 50mL of solution 3 were taken and added to a flask and 50 mL of Di water were added to the flask. This is solution 4. Find the concetrations of each solution.  Information of stock solution - molar mass- 534.3g/mole 0.587g in MilliQ

6. Answer Only Refer to the following mixtures: Mixture A: Liquid and solid mixture Mixture B. Liquid mixture whose boiling points are similar. Mixture C. Liquid mixture with high boiling point. Mixture D. Heat sensitive liquid mixture. Which of the following distillation can be applied for Mixture A? vacuum distillation fractional distillation simple distillation none of these —————— Refer to the following mixtures: Mixture A: Liquid and solid mixture Mixture B. Liquid mixture whose boiling points are similar. Mixture C. Liquid mixture with high boiling point. Mixture D. Heat sensitive liquid mixture. Which of the following distillation can be applied for Mixture B? vacuum distillation fractional distillation simple distillation none of these ———— Which of the following is NOT TRUE for Fehling's reagent, a reagent used for Fehling's test? A. In Fehling's reagent, the active ingredient is copper citrate. B. In Fehling's reagent, the active ingredient is copper…

b) Will the sample be contaminated with any of the impurities? Calculate the percent purity of the initial sample (in terms of compound A) - ( i.e. express the amount of compound A in the initial sample as a percentage of the mass of initial sample). Calculate the percent purity of the final sample (in terms of compound A) - (i.e. express the amount of compound A in the final sample as a percentage of the mass of final sample). Did the recrystallization procedure result in an increase of the percent purity of compound A in the sample? Comment on the results.

1. ASSERTION: The solubility of gases in water follows the order O2 < N2 < SO2 < CO2 < NH3. REASON: For appreciable solubility, the solute-solvent interactions should outweigh the solute-solute and     solvent-solvent interactions. a. Assertion and reason both are correct statements and reason is the correct explanation for assertion. b. Assertion and reason both are correct statements but reason is not the correct explanation for assertion. c. Assertion is a correct statement but reason is a wrong statement. d. Assertion is a wrong statement but reason is a correct statement. 2. ASSERTION: The solubility of all gases in water decreases with the rise in temperature. REASON: The dissolution of gases in water is an endothermic process. a. Assertion and reason both are correct statements and reason is the correct explanation for assertion. b. Assertion and reason both are correct statements but reason is not the correct explanation for assertion. c. Assertion is a correct…

Blank 1 is a condition that happens when the rates of dissolution and crystallization become equal. Blank 1 Add your answer

What is the correct procedure for making a stock solution after you have weighed the necessary amount of solute. O Add the solute to the volumetric flask, add solvent to just below the neck of the volumetric flask, invert the volumetric flask until the solute is dissolved, and then fill volumetric flask to the mark O Add solvent to the volumetric flask to just below the neck, add the solute to the volumetric flask, invert the volumetric flask until the solute has dissolved, fill the volumetric flask with solvent up to the mark O Add the solute to the volumetric flask, fill the volumetric flask with solvent up to the mark, invert volumetric flask until the solute has dissolved