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What is the difference between oil/water (O/W) type and water/oil (W/O) type emulsions? Give an example of each type.
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- How much of the preservative is needed to prepare a 120-mL preparation of Aluminum hydroxide gel based on this formulation? Ammonium alum 800 g Sodium carbonate 1000g Peppermint Oil 0.01% (0.01 g/100mL) Sodium benzoate 0.1% (0.1 g/100mL) Purified water, qs ad.2000 mL a. 0.12 g b. 60 g c. 48 g d. 0.012 gTrue/False: While emulsions and microemulsions consist of the same 3 ingredients; aqueous phase, oil phase and surfactant, those two preparations are vastly different in terms of their appearance and thermodynamic/physical stability.In a test tube, dissolve 10 drops of methanol in 3 ml. of water. Oxidize a copper wire spiral by passing it through a Bunsen burner. Plunge the red-hot wire into the alcohol solution several times, cooling the solution under the tap (faucet) so as not to evaporate too much of it. Next, add 1 drop of 0.5% resorcinol solution. Measure 2 ml. of concentrated sulfuric acid (CAUTION!) and pour this carefully down the sides of the test tube containing the mixture. Note the color of the zone intermediate between the acid and the solution. RESULT:
- A sample of water is found to contain Ca(HCO3)2 = 40.5, Mg(HCO3)2 =46.5, CaSO4=32.1, CaCl2=22.45, MgSO4= 27.6, SiO2=13.5, NaCl= 15.4 mg/L. Calculate Temporary, permanent and total hardness in degree French.Please answer all 5 questions (it could be short answers). 5-1. What is the main barrier to separating liquid mixtures of less than 500 mL by distillation? 5-2. A sample mixture of ethyl benzoate (bp 212 Celsius) and dodecane (bp 216.2 Celsius) is injected on two GC columns. Column A has DC710 silicone oil as the stationary phase, and column B uses polyethylene glycol as the stationary phase. Which substance would be certain to elute first from column A and would the same material be expected to elute first from column B? Which column, A or B, would be expected to give the better separation of these two substances? 5-3. Question 5-2 refers to separating a mixture of two high boiling liquids by gas chromatography. These materials have similar boiling points. List several GC variables and conditions that would make it easier to separate thesesubstances by gas chromatography 5-4. Capillary GC columns have better resolution than packed columns even though the enormous surface area…The alcohol content of hard liquor is normally given in terms of the “proof,” which is defined as twice the percentage by volume of ethanol (C2H5OH) present. Calculate the number of grams of alcohol present in 1.00 L of 75-proof gin. The density of ethanol is 0.798 g/mL. Round off to 4 sig. figures for all calculations made prior to final answer and the final answer should be in 3 sig. figures
- When a solution of 1.00 g of ‘X’ in 100 ml of water was shaken with 10 ml of diethyl ether, 0.60 g of X was transferred to the solvent (ether) layer. When another solution of 0.5 g of ‘X’ in 100 ml of water was shaken with 5 ml of petroleum ether, 0.3 g of X was extracted by the solvent. Which of these ethers is a better solvent? Justify your answer using calculations.What is the concentration in parts per million of DDT in each of the following? Part 1 of 2 9.0 mg in 1.4 kg needlefish tissue. Round your answer to 2 significant figures. Note: Reference the SI prefixes table for additional information. ppm DDT ☐ x10 Part 2 of 2 ☑ 7. × 10 4 g in 1.4 kg minnow tissue. Round your answer to 1 significant figure. Note: Reference the SI prefixes table for additional information. ppm DDT ☐ x x10How much of the suspending agent is needed to prepare a 60-mL preparation of Aluminum hydroxide gel based on this formulation? Ammonium alum 800 g Sodium carbonate 1000g Peppermint Oil 0.01% (0.01 g/100mL) Sodium benzoate 0.1% (0.1 g/100mL) Purified water, qs ad. 2000 mL a. 0.06 g b. 30 g c. 24 g d. 0.006 g
- /Explain how the two vitamins below reacts with water.Ensure you use the following polar,non-polar sigma and pi bonds. Identify all the functional groups present and describe how and why they interact with water. Vitamin C (Ascorbic acid) Vitamin E (alpha-topherol) HỌ HO. HO. OH HO H₂C H₂ CH₂ CH₂The water quality from a well test is given below. If the target hardness is 95 mg/L as CACO3, determine the amount of quicklime (mg/L as CaQ) and Soda (mg/L as Na,CO3) required. Constituents- mg/L CO2 13 НСОЗ- 180 Ca+2 59 SO4-2 90 Mg+2 23 CI- 12 K+ 15 Br 4.5How much diluting fluid would be required to make 100 mL of a 1/100 dilution from an undiluted stock solution? 1 mL 100 mL 99 mL 10 mL