in kg of water. You cool the water to 40°C. How much K₂Cr₂O7 17. stayed dissolved in the 1 kg of water? 18 You prepared an exact saturated solution of K₂Cr₂O7 at 70°C in 1 kg of water. You cool the water to 40°C. How much K₂Cr₂O7 flocked out of solution as a solid? How much K₂Cr₂O7 must be dissolved into 1 kg of water at 90°C to make an exact saturated solution? 19
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- a) Aspirin, which is acetylsalicylic acid, was the first NSAID use to alleviate pain and fever. If a solution of aspirin has an [OH-] = 1.0 x 10-5 M, what is the [H3O+], of solution? b):Aspirin, which is acetylsalicylic acid, was the first NSAID use to alleviate pain and fever. If a solution of aspirin has an [H3O+]= 4.7 x 10-2 M, what is the pH of the solution?Make 500 ml of 10 mM Tris-HCl; pH=7.5; 0.25 M Glucose; 0.1% Tween-20; 5% BSA Molecular weight of Tris-HCl = 157.6 g/mol. You have a 3M glucose stock. Tween-20 is a liquid. BSA is a solid. How many grams of Tris-HCl is used? How much of the 3M stock is used? How much of tween-20 is used? How much BSA is used? What is the process in making this solution?C7H21O4NHCl(aq) + NaOH(aq) ---> C17H21O4N(aq) + H2O (l) + NaCl(aq) When a 25mL of aqueous solution that contains 62.50g of the salt is treated with NaOH, the salt is converted to pure cocaine. How much water in litres is needed additionally to dissolve the formed pure cocaine?
- How many liters of softened water, containing a sodium concentration of 4 * 10 ^ - 2 % sodium by mass, have to be consumed to exceed the FDA recommendation ? (Assume a water density of 1g / m * L ) Express your answer using two significant figures.The process of Distillation is able to concentrate ethanol because: a. the boiling point of ethanol (78oC) is lower than the boiling point of water (100oC) b. CO2 is a gas that occupies ~22 liters per mole whereas ethanol is a liquid dissolved in water c. adding egg white traps CO2 bubbles which allows them to be separated from alcohol d. Sodium Aluminum Phosphate binds ethanol and concentrates it e. distillation removes the reducing equivalents “H2” from ethanol and lowers the calorie content making “light” calorie beveragesb) % yield of ethanol from molasses (we used 50 mL of the molasses solvent for both distillation) c) % yield ethanol from sugars, assuming approximately half of molasses is reactive sugars C12H22O11 (sucrose) -> 4 CH3CH2OH + 4 CO2 my Simple distillation % ethanol was 100% (0.774) and my fractional distillation % ethanol was 100% (0.774).
- A prescription calls for 150 mL of 0.5 % w/v prednisolone solution. If 4.0 % w/v prednisolone solution will be diluted with water, how many milliliters of water will be needed to prepare the prescription? (Answer must be numeric; no units or commas; round to the nearest 1 decimal place.Benoxinate hydrochloride 0.4% w/v Fluorescein sodium 0.25% w/v Sodium chloride qs Purified water qs 30 mL Make isoton. sol. Sig. use in the eye How much sodium chloride should be used in compounding the prescription?You need to make 100 mL of 1% Atropine sulfate solution and make it isotonic with sodium chloride Atropine sulfate has a MW of 695 and is 3 ions. (E = 0.12) For 100 ml of 1% atropine sulfate we have 1 g of atropine sulfate 1: How much NaCl is the atropine sulfate equivalent to 2 How much Sodium Chloride would be needed to make 100 mL of water isotonic? 3 How much sodium chloride should be added to the 1% atropine sulfate solution to make it isotonic
- 3. 5 mL acetic anhydride is to be added to 2 g salicylic acid. To how many equivalents (acetic anhydride/salicylic acid) does this correspond?A student, trying to standardize NBS solution using a standard Vitamin C solution (220 mg/L), obtained data that was obviously incorrect. They realized their mistake when they noticed the standard Vitamin C solution was dated 8/04. What was their mistake and explain why?MULTIPLE CHOICE: Choose the letter of the best answer Please answer all questions correctly 1. The standardization of volumetric solution does not require hydrochloric acid. A. Permanganometry B. Cerimetry C. Iodimetry D. lodometry E.All of the choices 2. In the standardization of its volumetric solution, the primary standard is dried to constant weight, which means drying shall be continued until two consecutive weighings do not differ by more than 0.50 mg. A. Permanganometry B. Cerimetry C. Iodimetry D. lodometry E.All of the choices 3. In the standardization of its volumetric solution, potassium iodide was added to A. Permanganometry B. Cerimetry C. Iodimetry D. lodometry E.All of the choices 4. Starch is the indicator of choice for these procedures because it forms intense blue coloration with the solution. A. Permanganometry B. Cerimetry C. Iodimetry D. lodometry E. C and D 5. In the standardization of its volumetric solution, the reaction needs to be…