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- 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:Weigh out accurately 9.99 g of copper(II) sulfate pentahydrate (CuSO4·5H2O) by taring using a clean and dry empty 250-ml beaker. 2. Add tap water to the beaker to reach the 50-mL mark on the side of the beaker. 3. Dissolve all the crystals of CuSO4·5H2O in the water using a clean glass rod for stirring. 4. Then using a glass funnel transfer all the blue solution to a 100-mL volumetric flask. Rinse the beaker with about 10 mL of water and transfer the solution to the volumetric flask. Repeat the rinsing of the beaker with another 10 mL of water and transfer the solution to the volumetric flask. This is called quantitative transfer of the solution. 5. Then add enough water to reach the calibration mark of the volumetric flask. (You will need to use a dropper to add the last few drops of water to ensure the meniscus is on the calibration mark). Close the volumetric flask with a stopper and mix the solution well (so that it is homogeneous). 6. You have now prepared a standard solution (or…Put some crushed ice in the 400 mL beaker. Allow some of the ice to melt then take the temperature. Record this as temperature of the ice. Temperature reading is 0.00°C Prepare accurately 20 % urea solution (2 grams urea in 8 grams distilled water). Place this solution in a hard glass test tube then place it in the beaker with crushed ice. Get the temperature of the urea solution at interval of 30 seconds. The temperature will go down until the freezing point is reached. Continue getting the temperature until 3 consecutive readings are identical. Record this as the freezing point of the solution. Temperature reading is -8.00°C. Make a general statement on the effect of solids upon the freezing point of liquid in which they are dissolved.
- Ratio of peppermint water to make 60ml? What is the stepwise procedure for preparation of peppermint water?13. A fish meal sample has the following composition: protein 20%, moisture 12%, additive 66%. The sample is placed in a drying oven and subsequent analysis gave a value of 22% protein. Calculate the % moisture content of the dried sample. 14. 1.000 g of soil, as-received, gave a moisture content of 14.00%. The oven-dried sample, completely moisture-free, showed 18.00% K. Find the percentage of K in the sample as received.xlYXJuZXItdWkvc2Vjb25kYXJ5L3VzZXItYXNzaWdubWV. Course Activity: Identifying a Substance by Its Properties ubstance 9 of 10 SU0odsagen aic uno container labeled water, and pour one tablespoon (15 mL) of alcohol into the container labeled alcoho Note that you now have three containers labeled unknown, water, and alcohol. For Part A Water and rubbing alcohol have distinct properties and will react differently with the same substance. Observe these properties of water and rubbing alcohol: color, smell, and ability to dissolve salt. Record your observations in the table. To observe the solubility of salt in the liquid, put one-quarter teaspoon of salt into each container and stir. You may weigh out 1.5 g of salt on the electronic balance if you don't have a one-quarter teaspoon measure. nents BIUX' X, Font Sizes A 三 三 耳昌 三 三 Water Rubbing Alcohol Color Smell Solubility of Salt Characters used: 60 / 15000
- The 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 4.5a. How to prepare 8.00% (v/v) ethanol solution? which option? option1.) Measure 8 mL of ethanol and dissolve it with 100 mL water. option2.) Measure 4 mL of ethanol and dissolves it with 45.5 mL water. option3.) Measure 7 mL of ethanol and dissolves it with 80.5 mL water option4.) Measure 8 mL ethanol and dissolve it with 91.5 mL water b. If there is 0.500 mg of selenium in 350 g of solution, calculate the selenium concentration? c.How many grams of NaCl and water are required to make 150 g of a 10% (w/w) NaCl solution? d.A solution with a density of 0.876 g/mL contains 2.5 g of substance A with a molar mass of 92.14 g/mol and 112.5g of benzene. Calculate the molality and molarity of the solution. e.What is the molarity and normality of a solution which is prepared by dissolving 75.0 g of Ba(OH)₂ in water and diluting it to 1.00 L. The molar mass of Ba(OH)₂ is 171 g/mol. f.If 25.0 mL of a 2.19 M solution are diluted with 72.8 mL, what is the final concentration?…If you are requested to compound 60 mL of the Concentrated Peppermint Water from the original amount of 500 mL of Concentrated Peppermint water containing: 10 mL of Peppermint Oil, 25 g talc, and 300 mL of 90% ethyl alcohol Calculate the volume of Peppermint Oil, required for the preparation. a 1.68 mL b 1.20 mL c 2.14 mL d 2.35 mL
- P * 00 T 00 3. Properties of Solutes in Aqueous Solutions Conductivity (Properties of Solutions, Part A): 1. How does the increase in solute concentration affect the conductivity of that solution? 2. Comment on the differences in conductivity for tap water, distilled water, ethanol, and glacial acetic acid. Are there differences, why/why not? 3. You tested the conductivities of sodium chloride, calcium chloride, and aluminum chloride. What was the trend in conductivity for these three chloride salts and why? Conductivity and lonic Reactions: A. Complete the table. Put the starting conductivity of each reactant in parentheses, list the conductivity of the mixture, and list the formulas MacBook Air 000 000 DD F7 F3 F4 F5 F6 F8 OLJ 23 2$ ) ( 4. F K HHow 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 gYou are the purchasing agent for a mill that is processing 1,500,000 yards a week of a cotton fabric that weighs 0.333 pounds/yard. Your plant manager wants to know how much of each of the processing chemicals to buy each month (=4 weeks). The formula that is used is: 6 g/L 35% Hydrogen Peroxide solution 8 g/L 50% Sodium Hydroxide solution 25 g/L 42% Sodium Silicate solution 5 g/L Wetting Agent The % wet pick in the plant is 90% owf. If the density of the 42% Sodium Silicate solution is 12.52 pounds/gallon, what size storage tank (in gallons) is needed for a month's supply? Give your answers in gallons/month with four significant figures.