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: What was the unknown Ni2+ M?

A: Given: 25.0 mL of an unknown Ni2+ solution was treated with 25.00 mL of 0.05283 M Na2EDTA. The pH of…

Q: the percentage of dimethylphthalate (DMP) in the sample.

A: According to the question a sample containing a mixture of dimethylphthalate (DMP) , C6H4(COOH3)2…

Q: A RbOH solution is titrated four (4) times against potassium hydrogen phthalate (KHP; FW=204.224)…

A: The given data is:   Mass of KHP(g) Volume of RbOH(mL) Trial-1 0.5373  42.49  Trial-2 0.5856…

Q: 1.50 mL of 0.15M Fe2(SO4)3 is diluted with deionized water to 25.00 mL in a volumetric flask. What…

A: Given, 1.50 mL of 0.15M Fe2(SO4)3

Q: An EDTA solution was prepared by dissolving approximately 4 g of the disodium salt in approximately…

A: Given mass of MgCO3 = 0.07682 g Volume of water = 1 L Molar mass of MgCO3 = 84.31 g/mol

Q: Is there a difference when the needle or metal clip is placed on the surface of distilled water with…

A:

Q: Describe one method of purification?

A: To find: The description about one method of purification

Q: A 0.5 mg/mL glucose solution was prepared and transferred to a burette. It took 79.25 mL of this…

A: Given: Concentration of glucose solution = 0.5 mg/mL Volume of glucose solution required = 79.25 mL…

Q: A cleaning product has 10.0 % oxalic acid (H2C2O4, pka1=1.42, pka2=4.4) as one of the ingredients.…

A: To find out the amount of a cleaning sample that must be used to titrate with 0.50 NaOH solution so…

Q: What is the solubility of CaF2CaF2 in a buffer solution containing 0.45 M formic acid and 0.20 M…

A: concentration of formic acid                                =  0.45 M  concentration of sodium…

Q: You were given a mixture of two miscible solvent A and B that you are tasked to separate. You know…

A: The mixture consist of two miscible solvent A and B which has different boiling points. Hence, the…

Q: Write the involved chemical reactions for this: An EDTA solution was prepared by dissolving…

A:

Q: Why does the glasswares need to be rinsed with 0.1 M HNO3 prior to use?

A: Analytical chemistry is branch of chemistry that refers  to technique for the detection,…

Q: What are the primary standard substances used in the adjustment of thiosulfate solutions? b.) When…

A: The question is based on the concept of iodometric titration. it is an indirect titration of iodine…

Q: The substance to be analyzed – is white, highly soluble in water salt. Reaction with NaOH gives…

A: Based on the above information of series of reactions involved, I am writing down the reactions…

Q: Calculate the equivalent weight of Na2CO3 when it is titrated against HCl in presence of…

A: The Answer to the following question is- a) reaction Na2CO3 + HCl ⇔NaHCO3 + NaCl  Molar mass of…

Q: A 25.0 mL sample of a 0.2500 M  solution of aqueous trimethylamine is titrated with a 0.3125 M…

A: (a) [HCl] = 0.3125 M Volume of HCl = 10 mL [(CH3)3NH2] = 0.2500 M Volume of (CH3)3NH2) = 25 mL pKb…

Q: -0.500 g sample consisting of NazCO3, NaHCO3, and inert materials was dissolved in sufficient vater…

A: Soln

Q: 0.2 mL of 10% sodium azide was added to 1.8 mL of 0.2% of YGM. What is the concentration of azide…

A: Given,  Volume of sodium azide V1 = 0.2 mL Concentration of sodium azide C1 = 10% = 0.01 Volume of…

Q: After a student determined the pK values of a H3PO4 by titration, she realized that she had recorded…

A: In the titration, pka Value is determined by titration with H3PO4 with NaOH. Molarity of NaOH Used…

Q: A student prepared 2-butanone (C4H8O) in the lab. To determine the purity of the product, the ketone…

A: Given: Initial volume of 2-butanone taken = 3 mL Volume of NaOH required to titrate the liberated…

Q: You titrate 50.00 mL of hard water with 14.86 mL of 0.0100 M EDTA solution. How many moles of Ca²+…

A:

Q: A titration experiment required 12.50 ml of standard hydrochloric acid solution to reach the…

A: Volume of HCl required for phenolphthalein endpoint = 12.5 mL Volume of HCl required for methyl…

Q: If it takes 12.24 mL of 1.0 M HCl solution to titrate 5.0 mL of saturated borax solution, what is…

A: Given data, 5.0 mL saturated solution of borax is titrated with 12.24 mL of 1.0 (M) HCl solution. We…

Q: Calculate the amount of solid in grams you would need to measure to prepare 50.0 mL of 0.100M sodium…

A: The molarity of the sodium acetate is = 0.100 M The volume of the solution is = 50.0 mL The mass of…

Q: Describe how you would efficiently prepare 0.75 liters of each of the following reagents: (Mw of…

A: The solution with a defined concentration can be made by the dissolution of a certain amount of…

Q: A 2.067 g of macrogol monostearate (average molecular weight 706. 5) was added to a 200 ml flask and…

A: Solution: We know the macrogol monostearate is the ester of stearic acid.  Saponification is the…

Q: A 40.0 mL solution of 0.0350 M hydroxylamine is extracted with 115 mL of solvent. The distribution…

A:

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

A:

Q: 5.Which substance would be the best buffer at pH 7.6 if it had to be able to buffer against either…

A: Answer:-This question is answered by using the simple concept of buffer solution and the spontaneity…

Q: HEPES ((4-(2-hydroxyethyl)-1-piperazine ethane sulfonic acid) is a commonly used cell culture buffer…

A:

Q: 5.0 mL of saturated borax solution requires 12.24 mL of 1.0 M HCI solution to titrate it. What is…

A: Given : Volume of Borax solution = 5.0 mL Volume of HCl = 12.24mL Molarity of HCl = 1.0M

Q: A 10 mL sample containing cyanide (CN-) is analyzed. It is mixed with 10 mL 1%(m/v) HCl to prevent…

A: Given: Volume of sample is 10 mL. Volume of HCl is 10 mL. Volume of water is 25 mL. Final…

Q: Acetic acid’s pKa is 4.75 and nitrous acid’s pKa is 3.16. If you made one buffer of equal parts…

A: Given: pKa of acetic acid = 4.75  pKa of nitrous acid = 3.16  And both the buffers have an equal…

Q: Describe the preparation of 500 mL of 0.0750 M AgNO3 from the solid reagent.

A: The desired solution to be prepared is 500 mL of 0.0750 M AgNO3(aq) solution.  First, we have to…

Q: A 28.93 mL aliquot of trimethylamine that has a concentration of 0.661 M will be titrated with 0.752…

A:

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: Why Should a pipette be rinsed with HCI and a burette with NaOH? prior to use of these solutions?

A: The above procedure is required for the strong acid and strong base titration and Pipette is rinsed…

Q: A solid containing tris was dissolved in water and brought to a total volume of 50.00 ml. A 10.00 ml…

A:

Q: 4. Determine the weight of pure urea in a 500 mg sample if 15.35 ml of 0.4967N NaOH were required in…

A: Given: The normality of 15.35 mL of NaOH is 0.4967 N. The normality of 50.0 mL of H2SO4 is 0.4861 N.…

Q: You prepare a buffer solution from 10.0 mL of 0.100M MOPS (3‑morpholinopropane‑1‑sulfonic acid) and…

A: Please find your solution below : Buffer solution is an aqueous solution of an acid or a base which…

Q: Using the 1 mM solution of p-nitrophenol (PNP) provided, create a series of dilutions. You will make…

A: The formula of dilution is  C1V1 = C2V2 Where, C1 and C2 are the concentrations of stock and diluted…