0.150 M of sucrose in 50mL flask Calculated Mass of C12H22O11=2.567 grams Experimental Mass of C12H22011= Color of Solution3 Dark blue when combined in 50 ml flask
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- Patients undergoing an upper gastrointestinal tract laboratory test are typically given an X-ray contrast agent that aids with the radiologic imaging of the anatomy. One such contrast agent is sodium diatrizoate, a nonvolatile water-soluble compound. A 0.378-m solution is prepared by dissolving 38.4 g sodium diatrizoate (NaDTZ) in.l.60 102 mL water at 3 1.2C (the density of water at 31.2C is 0.995 g/cm3). What is the molar mass of sodium diatrizoate? What is the vapor pressure of this solution if the vapor pressure of pure water at 31.2C is 34.1 torr?Find the normality of 0.0294 g K2Cr2O7 (MM = 294.19) dissolved in 125 mL solution.Describe the preparation of a 45.0 mL of 0.500 M solution of potassium permanganate solution, starting from 1.75 M of potassium permanganate solution? * Dilute 1.75 mL of 1.75 M of potassium permanganate solution to 45.0 mL. Dilute 12.9 mL of 1.75 M of potassium permanganate solution to 45.0 mL Dilute 45.0 mL of 1.75 M potassium permanganate solution and dilute to 0.500 L mark. Dilute 12.9 mL of 1.75 M potassium permanganate solution and dilute to 0.500 L mark.
- A chemist attempts to prepare some very pure crystals of borax by dissolving 100g of Na 2 B 4 O 7 in200 grams of boiling water. He then cools the solution slowly until some borax crystallizes out.Calculate the grams of borax recovered in the crystals per 100 grams of initial solution (Na 2 B 4 O 7plus water), if the residual solution at 55 0 C after the crystals are removed contains 12.4%Na 2 B 4 O 7 . What is the percent yield or percent recovery of Na 2 B 4 O 7 . (MW: Na =23, O =16, B=10.8,H =1) round off up to 4 decimal placesThe solubility of an unknown sample was determined. A volume of 20 mL of filtered supersaturated solution was transferred to an empty evaporating dish weighing 137.2365 grams. After drying in a Memmert oven, the evaporating dish now weighs 137.4492 grams. Determine the volume of water needed to dissolve 1 gram of the unknown sample.Prepare 100 μL of 10.0 mM hydrolyzed sucrose in 10.0 mM acetate pH 4.8 as a standard, in a 1.5 mL microcentrifuge tube, also incorporating 5.00 μL of 5.0 mM tris pH 7.4 within the 100 μL volume. Using a stock solution of 20.0 mM sucrose substrate in 10.0 mM acetate, calculate the volumes of hydrolyzed sucrose, acetate, and dH2O.
- Although other solvents are available, dichloromethane(CH₂Cl₂) is still often used to “decaffeinate” drinks because thesolubility of caffeine in CH₂Cl₂ is 8.35 times that in water.(a) A 100.0-mL sample of cola containing 10.0 mg of caffeine is extracted with 60.0 mL of CH₂Cl₂. What mass of caffeine re-mains in the aqueous phase? (b) A second identical cola sampleis extracted with two successive 30.0-mL portions of CH₂Cl₂.What mass of caffeine remains in the aqueous phase after each extraction? (c) Which approach extracts more caffeine?Chemistry What is the percentage purity of a sample of impure oxalic acid dihydrate if a sample weighing 0.2003 gram requires 29.30 mL of permanganate solution, of which 1.000 mL ≈ 0.006023 g iron?Twenty grams of potassium dichromote (K2C2O7) is dissolved in 150 mL of water. What is its normality as a solution? a) 0.70N b) 1.81 N c) 1.41 N d) 0.91 N The solution in the previous problem was used in titration producing chromium(II) oxide (CrO). What is the normality of the solution in the said reactin? a) 0.70N b) 1.81 N c) 1.41 N d) 0.91 N
- Prepare 0.1N H2SO4 solution of 250ml volume. (Density of H2SO4 is 1.84 and purity is 98 %)(A) if both sentences are true,(B) if both sentences are false,(C) if the first sentence is true but the second is false, and(D) if the first sentence is false but the second is true. 1. In the Winkler Titration Method, sodium thiosulfate is standardized against a known concentration of magnesium iodate. The normality (N) of a solution is always equal to its molarity (M). 2. In the experiment on determining the dissolved oxygen concentration of a water sample, the compound used to acidify the sample was hydrochloric acid. An acidic solution will have a pH greater than 7. 3. Radioactive wastes, like uranium, must be handled and disposed of according to special regulations designed to protect people and the environment. Nuclear power plants produce too much greenhouse gases due to the burning of uranium.The boiling point of diethyl ether, CH3CH2OCH2CH3, is 34.500 °C at 1 atmosphere. Kb(diethyl ether) = 2.02 °C/mIn a laboratory experiment, students synthesized a new compound and found that when 14.04 grams of the compound were dissolved in 299.9 grams of diethyl ether, the solution began to boil at 35.025 °C. The compound was also found to be nonvolatile and a non-electrolyte.What is the molecular weight they determined for this compound ?___g/mol
