Goody's acid base AC

Table of chemicals and reagents with their physicochemical properties (name, molecular formula, molecular weight, pKa, melting point, boiling point, etc.) Write a short outline or a flow diagram of the procedure List and safety issues Read and understand the MSDS information for each chemical used in this practical Experimental procedure Please do not scratch the clear sides of the UV cuvettes as this will invalidate your results. Part 1: Preparation of a calibration curve A calibration curve should be constructed using at least five concentrations of the pure paracetamol standard supplied in the range 3-15 ug/mL as follows: Weigh about 150 mg of paracetamol accurately and transfer to a 200 mL volumetric flask. Add 50 mL of o.1 M NaOH and dilute to about 100 mL with deionised water (DI). Shake and make up to volume with DI water. Dilute 10 mL of the resulting solution to 100 mL (volumetric flask) with DI water (= stock solution). Prepare standard solutions containing 3, 6, 9, 12 and 15…

During an assay of paracetamol by UV an analyst prepares a series of calibration solutions containing approximately 3-15 mcg/mL paracetamol as follows: 135.4 mg of pure paracetamol was added to a 200 mL volumetric flask. 0.1 M NaOH (50 mL) was added, the mixture well shaken and made up to volume with deionized water • 10 mL of the above solution was diluted to 100 mL a) What is the concentration of the final diluted solution in mcg/mL? Answer = mcg/mL (1 decimal) tem b) What volume of the diluted solution is required to prepare 100 mL of a 5 mcg/mL standard solution? Answer = mL (1 decimal) A Que

Exactly 5.00-mL aliquots of a methanol solution containing an unknown amount of methamphetamine were measured into 50.00-mL volumetric flasks. The following volumes of a standard methanol solution of methamphetamine containing 2.000 ug/mL of methamphetamine were then introduced into each flask and the mixture was diluted to volume with 0.000, 0.500, 1.00, 1.50 and 2.00 mL of methanol. 1 uL of these solutions was then injected into a gas chromatograph and the following respective peak areas were measured: 326, 480, 641, 802, and 956 (all peak areas were x 103).   Plot the data Using the plot from (a), calculate the concentration of methamphetamine in the unknown. Derive a least squares equation from the data. Calculate the concentration of methamphetamine from the equation in (c).

Below is the procedure described for determination of paracetamol according to BP: "Weigh and powder 20 tablets. Add a quantity of powder equivalent to about 0.35 g paracetamol to 50 ml of 0.1 M NaOH, dilute with water to 200 ml and shake for 15 min. Add sufficient water to make up 250 ml. Filter the solution and dilute 5 ml of the filtrate to 100 ml with water. Dilute further 10 ml to 100 ml. Measure the absorbance at 257 nm. The A," following is correct? 715 at 257 nm". Which of the O a. An analyst can take 0.37g of the powdered tablets instead of 0.35. O b. An analyst can replace NaOH with HCI OC. An analyst can skip the shaking step O d. B andC O e. All of the above

Below is the procedure described for determination of paracetamol according to BP: "Weigh and powder 20 tablets. Add a quantity of powder equivalent to about 0.35 g paracetamol to 50 ml of 0.1 M NaOH, dilute with water to 200 ml and shake for 15 min. Add sufficient water to make up 250 ml. Filter the solution and dilute 5 ml of the filtrate to 100 ml with water. Dilute further 10 ml to 100 ml. Measure the absorbance at 257 nm. The A = 715 at 257 nm". Which of the following is correct? O a. An analyst can take 0.37g of the powdered tablets instead of 0.35. O b. An analyst can replace NAOH with HCI C. An analyst can skip the shaking step d. B and C e. All of the above

Below is the procedure described for determination of paracetamol according to BP: "Weigh and powder 20 tablets. Add a quantity of powder equivalent to about 0.35 g paracetamol to 50 ml of 0.1 M NaOH, dilute with water to 200 ml and shake for 15 min. Add sufficient water to make up 250 ml. Filter the solution and dilute 5 ml of the filtrate to 100 ml with water. Dilute further 10 ml to 100 ml. Measure the absorbance at 257 nm. The A, = 715 at 257 nm". Which of the following is correct? O a. An analyst can take 0.37g of the powdered tablets instead of 0.35. O b. An analyst can replace NaOH with HCl O c. An analyst can skip the shaking step O d. B andC O e. All of the above

4 = 5 = 6 7 = 8 F 10 = 11 E 12 F 13 In a 0.20 mM aqueous solution of trimethylacetic acid (C¸H,CO,H), what is the percentage of trimethylacetic acid that is dissociated? You can find some data that is useful for solving this problem in the ALEKS Data resource. Round your answer to 2 significant digits. 0% Continue Submit Assignment O2020 McGraw-Hill Education. All Rights Reserved. Terms of Use | Privacy Accessibility esc 80 DD F2 F3 F4 F5 E7 F8 F9 F10 F11 F12

The sample is prepared by placing a single analgesic tablet in a small beaker and adding 10 mL of methanol. After allowing the sample to dissolve, the contents of the beaker, including the insoluble binder, are quantitatively transferred to a 25-mL volumetric flask and diluted to volume with methanol. The sample is then filtered, and a 1.00-mL aliquot transferred to a 10-mL volumetric flask and diluted to volume with methanol. When analyzed by HPLC, the signal for caffeine is found to be 21 469. Report the milligrams of caffeine in the analgesic tablet.

You are given a 1:1 (by weight) solid mixture of vitamin C and vitamin A, and you are going to use liquid-liquid extraction to separate one from the other (chemical structures are given below). If you decide to use water (density, 1 g/mL) and ethanol (density, 0.789 g/mL) as your extraction solvents, will this separation be successful? Why or why not? он HO HO. HO HO Vitamin C (ascorbic acid) Vitamin A (retinol)

Stoichiometry: Prolonged exposure of some functionalities to the eluent (methanol) in this experiment may lead to undesirable reactions. In one case, Acetylsalicylic acid (Aspirin) can react with methanol to form salicylic acid and methyl acetate. If 800 mg of Acetylsalicylic acid and 1 mL of Methanol undergoes such a side reaction (known as "Methanolysis") to completion: (a) write a balanced equation (draw all molecules instead of writing chemical formulas), (b) what is the limiting reagent? (c) predict the grams of salicylic acid and methyl acetate to be produced in this process. Show calculations. Hint: you can determine the grams of 1 mL of Methanol through its density.

Please send me the question in 30 minutes it's very urgent plz

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You have a sample of 90 mL cola drink that contains 50 mg of dissolved caffeine. Calculate the total mass of caffeine extracted using 54 mL of dichloromethane in each of the following procedures: the entire volume of dichloromethane is used in one step; the dichloromethane is divided into two (27 mL) portions in a two-step extraction and into three (18 mL) portions in a three-step extraction. Please use two decimal places. Number of extraction steps One Step Two Steps Three Steps Extracted caffeine mass (mg) (Submit)

A titration experiment required 12.50 ml of standard hydrochloric acid solution to reach the phenolphthalein endpoint. A few drops of methyl orange were added into the analyte, and it consumed 23.60 mL more of the standard acid solution. Which of the following is TRUE about the analysis? O The analyte contains only sodium carbonate solution. O The analyte contains sodium hydroxide and sodium bicarbonate solution. The analyte contains both sodium carbonate and sodium bicarbonate solution. The analyte contains sodium hydroxide only O The analyte contains only sodium bicarbonate solution.

Oral rehydration salts are stated to contain the following components: Sodium Chloride  3.5g Potassium Chloride  1.5g Sodium Citrate  2.9g Anhydrous Glucose  20.0g 8.342 g of oral rehydration salts are dissolved in 500 ml of water. 5 ml of the solution is diluted to 100 ml and then 5 ml is taken from the diluted sample and is diluted to 100 ml. The sodium content of the sample is then determined by flame photometry. The sodium salts used to prepare the mixture were: Trisodium citrate hydrate (C6H5Na3O7, 2H2O) MW 294.1 and sodium chloride (NaCl) NW 58.5. Atomic weight of Na = 23. The content of Na in the diluted sample was determined to be 0.3210 mg/100 ml. Determine the % of stated content of Na in the sample.

A 10-mL aqueous solution of acetaminophen was extracted with 10 mL of octanol. The initial aqueous solution had an absorbance of 0.971 after 600 µL was diluted with 1400 µL of water. After extraction, undiluted aqueous phase had an absorbance of 1.047. Find Kow of acetaminophen. Kow = 0.01095

A sample of rainwater was collected from four separate locations across theMetroplex. Each sample was measured once by two separate methods for the presence ofsulfate. Determine whether the two methods are equivalent with respect to giving thesame answer for [SO42-].

A 50.0 mL juice extract is colorimetrically assayed using Nelson’s test. One milliliter (1.00 mL) of the solution and the standard glucose solution (concentration: 1mg/mL) were treated with freshly prepared Nelson’s reagent and arsenomolybdate reagent and then diluted to 10.0 mL separately in properly labeled test tubes. Absorbance at 480 nm for the standard is 1.702 and for the sample, 0.926.   Calculate the concentration of the reducing sugar in the 50.0 mL sample in mg/mL. Apply Beer-Lambert’s law: A=bc.

A 50.0 mL juice extract is colorimetrically assayed using Nelson’s test. One  milliliter (1.00 mL) of the solution and the standard glucose solution (concentration:  1mg/mL) were treated with freshly prepared Nelson’s reagent and arsenomolybdate  reagent and then diluted to 10.0 mL separately in properly labeled test tubes.  Absorbance at 480 nm for the standard is 1.702 and for the sample, 0.926. A. What is the principle behind the assay?

A 50.0 mL juice extract is colorimetrically assayed using Nelson's test. One milliliter (1.00 mL) of the solution and the standard glucose solution (concentration: 1mg/mL) were treated with freshly prepared Nelson's reagent and arsenomolybdate reagent and then diluted to 10.0 mL separately in properly labeled test tubes. Absorbance at 480 nm for the standard is 1.702 and for the sample, 0.926. A. What is the principle behind the assay? B. Calculate the concentration of the reducing sugar in the 50.0 mL sample in mg/mL. Apply Beer-Lambert's law: A=ɛbc. Computations: Answer:

The following chromatogram was the output of the analysis of phytosterols in plants by gas chromatography. Cholesterol Campesterol Stigmasterol Brassicasterel osteral 16.5 17.0 17.5 18.0 18.5 Min From the chromatogram which compound had the lowest boiling point? A Campesterol B Stigmasterol Cholesterol

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For question below the separation scheme, please indicate the compound that best fits in the blank of the separation scheme . Hint: s = solid, 1 = liquid, g = gas and aq = aqueous. 4-methylacetophenone soluble aluminum salt (A1C13 destroyed by aqueous HC1) acetic acid (from any unreacted acetyl chloride) trace toluene hydrochloric acid water aq soluble aluminum salt acetic acid hydrocholic acid water methylene chloride multiple Extractions with water and methylene chloride organic 4-methylacetophenone methylene chloride trace toluene trace acetic acid, and H₂O trace 3) organic 4-methylacetophenone methylene chloride trace toluene trace water extract with aqueous 4). aq 5) sodium chloride water CO₂(g)

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A student developed a new dye called Dye C. It was analyzed against other dyes using paper chromatography. A solution of 1:1 ethyl acetate:hexane was used as the eluent. The resulting chromatogram is shown below. What other dye/s are present in dye C?  Which dye contains the least number of pigments?

6.0 mL of cyclohexanol, 8 mL of 85% phosphoric acid, and 10 drops of sulfuric acid are added to a 50-mL round-bottom flask with boiling chips, and the mixture is distilled into an ice-cooled receiver. The distillate is in the form of a colorless bi-phasic mixture. The cyclohexene upper layer is removed from the water layer, and dried over anhydrous calcium chloride. Isolated is cyclohexene as a clear and colorless foul-smelling liquid. Weighing data is given below. Gross mass: 51.24 g Tare mass: 48.04 g Product mass: 3.2g Question:  Calculate the theoretical mass of the cyclohexene product, bearing in mind that the cyclohexanol starting material was measured by volume, not by mass (so you must use the density of cyclohexanol to convert milliliters to grams, before calculating the number of moles). Calculate the percent yield of cyclohexene obtained.

In spectrophotometry, does the sample tested contain the allowable concentration of Allura red as prescribe by the FDA?

Calculate the volume of NaOH used in each trial. Use sig figs.