25 µL of hydrochloric acid solution (4350 ppm) onto 100 mg of silica gel. The next day I desorbed the HCl with 10 mL of standard eluent. 5 mL of this solution was found to contain 42 µg of hydrogen chloride. What is the desorption efficiency?
Q: 9. The water-soluble vitamins B₁ (thiamine hydrochloride), B₂ (riboflavin), B3 (niacinamide), and B…
A: According to the given pKa value and the following structure, the order of elution for the four B…
Q: 4 g 5 g 28 100 g R Lactic acid Salicylic acid Trichloroacetic acid Flexible collodion qs ad Sig:…
A: Given, Mass of lactic acid = 4 gm Mass of salicylic acid = 5 gm Mass of tri chloroacetic acid = 2 gm…
Q: The water-soluble vitamins niacinamide (a neutral compound), riboflavin (a neutral compound), niacin…
A: Micellar Electrokinetic Capillary Chromatography is a hybrid of electrophoresis and chromatography.…
Q: What is the total amount of compound you can recover after the first recrystallization of 5g impure…
A: First we have to eliminate the impurity from the crude. Now the mixture is heated to make NBS…
Q: When 10 g of activated carbon is mixed with 1 M 100 ml of acetic acid solution and filtered, a 20 ml…
A: In such question determine the amount of acetic acid initially and then in filtrate with the help of…
Q: Q: 1: The distribution constant for iodine between an organic solvent and H,0 is 85. Find the…
A: Hello. Since your question has multiple parts, we will solve the first question for you. If you want…
Q: Please answer the following with complete solution. Thank you. A mixture placed in an Erlenmeyer…
A: Given, Volume of silica gel = 6mL Volume of solvent = 40 mL mass of non volatile compound = 100 mg…
Q: Vitamin C content in nutraceutical fomulation can be detemined by 2,6- dichloroindophenol…
A: Vitamin C is one of the water soluble vitamins. It is found in sour fruits and is important to…
Q: If 100 ml of a 1:1500 methylbenzethonium chloride lotion is diluted with an equal volume of water,…
A:
Q: A total of 5 mL of blood samples were treated with trichloroacetic acid to precipitate proteins.…
A: Solution: In this problem we have to calculate the concentration of Pb in ppm
Q: Given a disinfectant concentration dosage of 1.6 mg/L, estimate the retention time that you would…
A: The disinfectant concentration dosage of 1.6 mg/l Chlorine is used as a disinfectant. The…
Q: The distribution coefficient for iodine between CCl4 and H2O is 85. Calculate the concentration of…
A: Given : Distribution coefficient (K) = 85 concentration of I2 = 1.00 x 10-3 Calculate the…
Q: Samples X and Y were analysed for Na by flame emission photometry. A series of standard solutions…
A: A question based on analytical process that is to be accomplished.
Q: 1: What is the molar concentration of a 4% solution of borax? (sodium tetraborate decahydrate,…
A: We’ll answer the first question since the exact one wasn’t specified. Please submit a new question…
Q: A chromatography column has a stationary phase volume that is 0.130 times the volume of the mobile…
A: Given : The volume of stationary phase is 0.130 times than that of volume of mobile phase. Let the…
Q: 4 litres of water obtained from a borewell in Vellore contains FeSO4 = 30.4 mg; CaSO4 = 13.6 mg;…
A:
Q: 50.0 mL of 0.200 M X is treated by extraction with the following quantities of n-hexane? (i) one…
A: The question is based on the concept of solvent extraction. we have to calculate amount of solute…
Q: A 5.00-mL sample of blood was treated with trichloroacetic acid to precipitate proteins. After…
A:
Q: Following AAS analysis, a graph of absorbance versus ppm nickel standard gave a best-fit line y =…
A:
Q: Which are true for polarography? I Polarography is amperometry conducted with a dropping…
A: Please find the below text answer. Thank you
Q: What kind of sample cleanup does solid-phase extraction accomplish in the analysis of caffeine and…
A: Introduction: Extraction is the process of separation of the molecules. There are two types of…
Q: A sample of anhydrous NaHCO3 (FM = 84.007) is suspected to be contaminated with either NaOH (FM =…
A: NaHCO3 is present as the Impurity. Now, mass of Na2CO3 Present = 27.2×10-3×0.0125×4×5×105.989 =…
Q: Calculate the percent error in Avogadro's number calculated by using the following experimental…
A: Concentration of stearic acid = 1.2×10-4gram/milliliter.Number of drops to complete monolayer = 23…
Q: 25 mg / 100 mL. A.Calculate the percent concentration of TPA in the solution.…
A: A) 0.025% w/v TPA B) 0.025 ml
Q: What should we use a) to measure 5.50 g of CuSO4·5H2O: ______________________ b) To dry CuSO4 over…
A:
Q: An unknown sample containing moved alkal (NaOH, NaHCO or Na CO) was analyzed using the double flask…
A:
Q: 60 ml of standard hardness containing 1 mg of pure CaCO3 per ml consumed 22 ml of EDTA. 40 ml of…
A: A numerical problem based on EDTA complexometric titration, which is to be accomplished.
Q: Nitric acid samples were prepared by diluting the 68 w/v% high purity-grade or 61 w/v% electronic…
A: 68 % w/v means 68 g of HNO3 is present in 100 mL solution. Determination of no. of mol. of HNO3:…
Q: 7. A sample of anhydrous NaHCO; (FM = 84.007) is suspected to be contaminated with either NaOH (FM =…
A:
Q: The distribution ratio for X between n-hexane and water is 8.9. Calculate the concentration of X…
A:
Q: NH3 obtained when 0.5 g of an organic compound substance was subjected to Kjeldahl's method was…
A:
Q: In a GC run, dodecane was used as test solute for a 30 m x 250 ?m i.d. DB-5 column. The dodecane…
A: Theoritical plate in chromatography is a key parameter of chromatography. It is a index of coloumn…
Q: 0.56 g 1,4‐dimethoxybenzene, 0.9 mL 2‐chloro‐2‐methylpropane, 5 mL nitrobenzene and 0.52 g graphite…
A: The given problem is related to green chemistry. Given: Reactants- Mass of 1,4‐dimethoxybenzene-…
Q: Below is overlaid chromatograms for the separation of cytidine on a bare silica stationary phase…
A: The time period for which a solute is present in the column for the interaction with the stationary…
Q: 4. determine the amount in mg of the amount of Ag present from ICP mass digested: 1.0821g/L dilution…
A: Inductively coupled plasma mass spectrometry, commonly known as ICP-MS, is one type of spectrometry…
Q: One common way to determine phosphorous in urine is to treat the sample after removing the protein…
A: The table is given below:
Q: Two compounds were separated using gas chromatography. The retention times were 628 and 642 s, and…
A: Given: In gas chromatography the retention time for both compounds is 628 s and 642 s. The width of…
Q: Which statement about the determination of the percentage purity of benzoic acid is correct? *…
A: We have given statements , we have to choose correct statement
Q: what is Optical rotatory dispersion and circulatory dichroism method for protein binding?
A: Answer - Optical rotatory dispersion - Optical rotatory dispersion is the variation in the optical…
Q: Objective: To determine the percent NaCl (w/v) of a water sample 5.00 mL sample diluted to 50 mL…
A: Balanced chemical equation: NaCl (aq) + AgNO3 (aq) ------> NaNO3 (aq) + AgCl (s) From the…
Q: Objective: To determine the percent NaCl (w/v) of a water sample 5.00 mL sample diluted to 50 mL…
A: The question is based on the concept of quantitative estimation. we have to calculate percentage…
Q: A 100 mL of 0.375 M CH3COOH solution was shaken with 1.0 g charcoal for 5 min. After filtration, 10…
A: I have given a detailed solution to the question as follows:
Q: There are two main types of gravimetric analysis. Volatilization methods are based on isolation and…
A: The given statement is false. Volatilization gravimetry involves separating components of our…
Q: What is the molar extinction coefficient at 625 nm for this copper (II) acetate solution? How was it…
A: According to Beer Lambert law, the absorbance of any solution is directly proportional to the…
Q: 1.What is the significance when KD is either a small or large value? 2. Methyl alcohol and ethyl…
A: Hello. Multiple questions have been posted. The first question has been solved. To receive solutions…
Q: Calculate the Mg (OH) 2 content of MOM, 13.2 g of which was dissolved in 55.00 mL of 1.2642 N H2S04…
A: Mg(OH)2 is first reacted with H2SO4. The excess H2SO4 is then reacted with NaH.
Q: What kind of “cation and anion exchanger resins” can be used in the columns of an ion chromatography…
A: Ion chromatography is a type of liquid chromatography that is used to measure the concentration of…
Q: When 10 g of activated carbon is mixed with 1 M 100 ml of acetic acid solution and filtered, a 20 ml…
A:
Q: You prepared a stock solution by dissolving a compound with the molar mass of 110.65 in a 100 mL…
A: Given : Molar mass of compound = 110.65 g/mol Final volume of solution = 250 mL = 0.250 L…
Q: 4g 5 g 2 g 100 g 49." R Lactic acid Salicylic acid Trichloroacetic acid Flexible collodion qs ad…
A:
Q: The Ksp of Mg(OH)2 is 5.61 x 10-12, If you tried to dissolve 24.0 mg of Mg(OH)2 in 250 mL of wąter…
A: I think your question is incorrect. It should be ask the amount of dissolved solid according to…
An experiment was carried out to determine desorption efficiency. I placed
25 µL of hydrochloric acid solution (4350 ppm) onto 100 mg of silica gel.
The next day I desorbed the HCl with 10 mL of standard eluent. 5 mL of
this solution was found to contain 42 µg of hydrogen chloride. What is the
desorption efficiency?
Trending now
This is a popular solution!
Step by step
Solved in 3 steps
- An unknown sample containing mixed alkali (NAOH, NaHCO3, or NazCO3) was analyzed using the double flask method. A 250 mg sample was dissolved in 250 mL CO, free water. A 20.0 mL aliquot of this sample required 11.3 mL of 0.009125 M HCI solution to reach the phenolphthalein end point. Another 29.0 mL aliquot of the sample was titrated to the bromocresol green endpoint using 311 mL of the standard acid. What is/are the component/s of the sample? O Cannot be determined O NAHCO3 only O NAOH and Na,CO3 O NazCO3 only O NAHCO, and Na2CO3An unknown sample containing mixed alkali (NAOH, NaHCO3, or NazCO3) was analyzed using the double flask method. A 250 mg sample was dissolved in 250 mL CO, free water. A 20.0 mL aliquot of this sample required 11.3 mL of 0.009125 M HCI solution to reach the phenolphthalein end point. Another 29.0 mL aliquot of the sample was titrated to the bromocresol green endpoint using 31.1 mL of the standard acid. What is/are the component/s of the sample? O NazCO3 only NaHCO3 only O NAHCO3 and Na>CO3 NaOH and NazCO3 O Cannot be determinedThe Kjeldahl method was used to determine the nitrogen content of a protein. A 275 µL aliquot of a 47.0 mg/mL protein solution was digested in boiling sulfuric acid. The solution was made basic and the liberated NH, was collected in 5.00 mL of 0.0512 M HCl. A volume of 7.00 mL of 0.0174 M NaOH was required to react with the excess HCl. Calculate the weight percent of nitrogen in the protein. weight percent: wt% N
- Treatment of ammonia with phenol in the presence of hypochlorite yields indophenol, a blue product that absrobs light at 625 nm, which çan be used for the spectrophotometric determination of ammonia. gan OCF OH + NH3 indophenol anion To determinè the ammonia concentration in a sample of lake water, three samples are prepared. In sample A, 10.0 mL of lake water is mixed with 5 mL of phenol solution and 2 mL of sodium hypochlorite solution, and diluted to 25.0 mL in a volumetric flask. In sample B, 10.0 mL of lake water is mixed with 5 mL of phenol solution, 2 mL of sodium hypochlorite solution, and 2.50 mL of a 5.50 x 10-4 M ammonia solution, and diluted to 25.0 mL. Sample C is a reagent blank. It contains 10.0 mL of distilled water, 5 mL of phenol solution, and 2 mL of sodium hypochlorite solution, diluted to 25.0 mL. The absorbance of the three samples is then measured at 625 nm in a 1.00 cm cuvette. The results are shown in the table. Sample Absorbance (625 nm) A 0.361 B 0.608 C…The nitrite in a series of standard solutions (mg/L, n = 5) are converted to azo dye and the slope of the calibration curve is 2.0 ppm1. A 10.00-mL mineral water sample is treated in the same way as standards and diluted to a final volume of 100.00-mL. It gives an absorbance of 0.80. The absorbance of blank solution under the same conditions is 0.10. Calculate ppm (mg/L) of NO2 (46 g/mol) and the molarity of NANO2 (69 g/mol) in the original sampleThe Kjeldahl method was used to analyse the nitrogen content in 0.6723 g of food sample. The amount of liberated NH3 in the sample was reacted with 50.0 mL of 0.1050 M HCl. The excess acid required 12.35 mL back titration with 0.0915 M NaOH. Calculate the % nitrogen in the sample.
- The distribution coefficient for iodine between CCl4 and H2O is 85. Calculate the concentration of I2 remaining in the aqueous layer after extraction of 50.0 mL of 1.00 x 10- 3 F I2 with the following quantities of CCl4: (a) two 25.0 mL portions. (b) five 25.0 mL portions.Treatment of ammonia with phenol in the presence of hypochlorite yields indophenol, a blue product that absrobs light at 625 nm, which can be used for the spectrophotometric determination of ammonia. ocr SHN + HO- indophenol anion To determine the ammonia concentration in a sample of lake water, three samples are prepared. In sample A, 10.0 mL of lake water is mixed with 5 mL of phenol solution and 2 mL of sodium hypochlorite solution, and diluted to 25.0 mL in a volumetric flask. In sample B, 10.0 mL of lake water is mixed with 5 mL of phenol solution, 2 mL of sodium hypochlorite solution, and 2.50 mL of a 5.50 x 104 M ammonia solution, and diluted to 25.0 mL. Sample C is a reagent blank. It contains 10.0 mL of distilled water, 5 mL of phenol solution, and 2 mL of sodium hypochlorite solution, diluted to 25.0 mL. The absorbance of the three samples is then measured at 625 nm in a 1.00 cm cuvette. The results are shown in the table. Absorbance Sample (625 nm) A 0.401 В 0.648 0.045 What…An unknown sample containing mixed alkali (NAOH, NaHCO3, or NazCO3) was analyzed using the double flask method. A 250 mg sample was dissolved in 250 mL CO2 free water. A 20.0 mL aliquot of this sample required 11.3 mL of 0.009125 M HCI solution to reach the phenolphthalein end point. Another 29.0 mL aliquot of the sample was titrated to the bromocresol green endpoint using 31.1 mL of the standard acid. How many millimoles of the components are there in the original solid sample? O 0.28 mmol Na,CO3 O 1.29 mmol NaOH, 0.97 mmol Na2CO3 O 0.103 mmol NaOH, 0.078 mmol NazCO3 O 1.29 mmol Na2CO3, 0.97 mmol NaHCO3 O Cannot be determined
- 0.368 mmoles of NaOH(0.0491 M) is added to 25 ml of sprite during a titration. How many mmoles of Citric acid are present in the sample of sprite?An unknown sample containing mixed alkali (naoh, nahco3, or na2co3) was analyzed using the double flask method. a 250 mg sample was dissolved in 250 ml co2 free water. a 20.0 ml aliquot of this sample required 11.3 ml of 0.009125 m hcl solution to reach the phenolphthalein end point. another 29.0 ml aliquot of the sample was titrated to the bromocresol green endpoint using 31.1 ml of the standard acid. how many millimoles of the components are there in the original solid sampleA 0.2985 g sample of an antibiotic powder was dissolved in HCl and the solution diluted to 100.0 mL. A 20.00 ml aliquot was transferred to a flask and followed by 25.00 ml of 0.01886 M KBRO3. An excess of KBr was added to form Br2, and the flask was stoppered. After 10 min, during which time the Br2 brominated the sulfanilamide, an excess of KI was added. The liberated iodine titrated with 12.88 ml of 0.1235 M sodium thiosulfate. Calculate the percent sulfanilamide (NH2C,H4SO2NH2) in the powder. Bro, + 5Br + 6H* 3Br, + 3H,0 NH2 NH2 Br. Br + 2B12 + 2H++ 2Br SO,NH2 SO,NH2 sulfanilamide Br, + 51 2Br + 12 excess 2 + 25,0,- 25,0,2 + 21- - MM: NH2C6H4SO2NH2 = 172.21 KBRO3 = 167.00 KBr 119.00