Tea leaves were boiled and around 1.00 gram of caffeine were extracted using 175.0 ml of water. if three portions of 20.0 ml of dichloromethane were ised to extract the caffeine from the aqueous layer how may caffeine will be extracted by dichloromethane? Solubility of caffeine in water: 2.18 g per 100 ml water Solubility of caffeine in dichloromethane: 18.2 g per 100 ml dichloromethane

Q: Approximately 6 mL of concentrated perchloric acid (72%) was transferred to a bottle and diluted…

A:

Q: 2. Digoxin was solubilised in ethanol. What is the solubility of Digoxin (pKa 7.3) at pH 3, if the…

A: 2) solubility of dissociated form of digoxin 3) solubility of dissociated form of phenobarbital

Q: 2.1g of sample are dissolved in methylene chloride and the sample is extracted with an aqueous…

A:

Q: An unknown sample containing mixed alkali (NAOH, NaHCO3, or NazCO3) was analyzed using the double…

A:

Q: Describe the preparation of 500 mL of 3.50% (w/v) aqueous glycerol

A: Given: Concentration in %(w/v) of aqueous glycerol solution = 3.50 % And volume of solution = 500…

Q: a) 0.132g of a pure carboxylic acid (R-COOH) was dissolved in 25.00mL of water and titrated with…

A: (a) The number of moles of NaOH (n) is calculated using equation (1) in which C is the concentration…

Q: 0.75 gm of calcium carbonate is dissolved in 1 liter of distilled water. 100 ml of this standard…

A: 0.75 gm of calcium carbonate is dissolved in 1 liter of distilled water. 100 ml of this standard…

Q: Calculate the percentage of Atropine in Belladonna powder using 10.7 g sample and adding 20 mL of…

A: Given data,Mass of sample=10.7gNormality of H2SO4=0.0225NVolume of H2SO4=20mLNormality of…

Q: The Kjeldahl procedure was used to analyze 244 µL of a solution containing 38.1 mg protein/mL.  The…

A: In Kjeldahl process nitrogen is estimated by following expression Percentage of…

Q: A solution contains formic and tartaric acids. A 25.00 mL aliquot portion is treated with 50.00 mL…

A: The reactions which take place in the titration of tartaric acid and formic acid are as follows:…

Q: A 0.9134-g of KIO3 is dissolved in 500-mL distilled water. A 50.0-mL aliquot portion was run down…

A:

Q: 0.15 gm of calcium carbonate is dissolved in 1 liter of distilled water. 20 ml of this standard hard…

A: Hardness  of water is due to calcium and magnesium within the water molecules. Hardness or softness…

Q: Calculate the saponification value of a sample of castor oil from the following data: Weight of oil…

A: Saponification value or saponification number (SV or SN) represents the number of milligrams of…

Q: Calculate the amount of potassium chloride needed to prepare a 60 mL ORS based on the given…

A:

Q: 1.What is the lactic acid concentration (in M) of the titrated sample? 2. Determine the lactic acid…

A:

Q: Calculate the percent moisture in aminosalicylic acid if 9 ml of KF reagent is having a water…

A: Karl filter rotation is generally used to calculate the water content in a sample.

Q: What is the solubilty of PbF2 in water? the Ksp for PbF2 is 2.7 x 10^-8

A: PbF2→Pb+2+2F-            S        2S

Q: 100 mg of anhydrous powder of lysine is not completely soluble in 10 mL of water but dissolves…

A: Lysine is an amino acid that has a side chain at neutral pH. Its structure is shown as follows:

Q: 1) Describe the color and appearance changed you observed when you dissolved NiSO4 · 6H2O in…

A: As per rule only the first question (Question 1)  can be answered and an explanation will also be…

Q: A 0.951-g sample containing (NH4)2C2O4 and compounds was dissolved in water and made alkaline with…

A:

Q: group of wealthy chemistry 1A students had a little too much disposable income and decided to create…

A: Given that,  Solubility of RhBr3 in water = 0.026 mg/mL = 0.026 g/L Molecular weight of RhBr3 =…

Q: You carry out the alkalinity titration of 100 mL water sample and find that it requires 12 ml of…

A: A numerical problem based on environmental pollution that is to be accomplished.

Q: 0.45 gm of calcium carbonate is dissolved in 1 liter of distilled water. 50 ml of this standard…

A: 1mL of standard hard water contains 1mg of CaCO3.

Q: In the preparation of the standard curve for protein analysis, 50 mn BSA (bovine serum albumin)…

A:

Q: Consider a titration of 40.00 mL of 0.1250 M Na2CO3 with 0.4000 M HCl.  Carbonic acid (H2CO3) has a…

A:

Q: What is the purpose of performing a blank titration in the assay of ibuprofen?    A. To determine…

A:

Q: Why is the collection done through a 10% Na,CO, solution? Remove traces of acids or neutralizes the…

A: The alcohol functional group in a molecule is observed by the presence of -OH group. For example,…

Q: If Mg(OH)2 has a Ksp of 7.0 × 10–7, then what is the solubility of Mg(OH)2 in pure water in g/L?

A:

Q: NH3 obtained when 0.5 g of an organic compound substance was subjected to Kjeldahl's method was…

A:

Q: . One gram of caffeine dissolves in 55 mL of water, 7 mL of Dichloromethane, 530 mL of diethyl…

A: volume of water = 55 mL/1000 = 0.055 L volume of dichloromethane = 7 ml = 0.007 L volume of…

Q: Approximately 6 mL of concentrated perchloric acid (72%) was transferred to a bottle and diluted…

A:

Q: Why is caffeine more soluble in Dichloromethane than in water?

A: Solubility rule is that like dissolves like. Polar molecule dissolved in polar solvent.

Q: Calculate the amount of caffeine extracted from coffee beans using 1.0215g of the sample. The volume…

A: Given, Mass of sample is = 1.0215 g. Volume of H2SO4  is = 25.4 mL Concentration of H2SO4 is = 0.025…

Q: A certain lipid sample consists of a wax of unknown molecular weight and composition. It is known,…

A: Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: Blood added with 25 ml distilled water + submerged in a water bath, added 1-2 drops of 10% acetic…

A: A question based on qualitative analysis, which is to be accomplished.

Q: A proportion of fentanyl is known to be lost to IV infusion bags made from PVC on storage and this…

A:

Q: 0.9000-g of KIO3 is dissolved in 500-mL distilled water. A 50.0-mL aliquot portion was run down into…

A:

Q: A mixture contains Na2CO3, NaOH and inert matter. A sample weighing 28.85 ml of 0.5000N HCl to reach…

A: In acid base titration, equivalence point is obtained when indicator changes the color of the…

Q: A mixture of benzoic acid and naphthalene was separated by a liquid-liquid extraction by converting…

A: Here we have to choose the correct option about how can be the benzoic acid can be recovered after…

Q: Calculate the final molarity of H2O2H2O2 if 1.3 mL1.3 mL of the 3.0% w/w H2O23.0% w/w H2O2 solution…

A: Final Molarity of H2O2 =? Initial Volume = V1 = 1.3 mL Final Volume = V2 = 1.3 mL H2O2 + 3.7 mL H2O…

Q: An unknown sample containing mixed alkali (naoh, nahco3, or na2co3) was analyzed using the double…

A:

Q: In what proportion may the Manufacturing pharmacist mix 20%, 15%, 5% and 3% ZnO to produce 10% ZnO…

A: In pharmaceutical composition preparation, First, we have to pair an ointment of weaker strength…

Q: An unknown sample containing mixed alkali (NaOH, NaHCO3, or NazCO3) was analyzed using the double…

A:

Q: Part A. The solubilities of benzophenone, succinic acid and biphenyl were tested in water, methanol…

A: The bond formed by the atoms which have different electronegativities and have a large dipole moment…

Q: A 0.951-g sample containing (NH4)2C2O4 and compounds was dissolved in water and made alkaline with…

A: The law of chemical equivalence states that the number of reacting equivalents of all the reactants…

Q: A sample of Al2(SO4); weighing 7.52-g was dissolved in enough water and diluted to 250.0-mL.…

A: Given: Mass of sample = 7.52 g. The sample is diluted to 250 mL. Volume of diluted sample used =…

Q: final volume of 500mL, what is the percent (w/v) concentration of NaCl in the solution? 3) How will…

A: