A 5.00 mL sample of filtered orange juice was treated with 50.00 mL of 0.01023 M I3 – to oxidize ascorbic acid to dehydroascorbic acid. After the oxidation was complete, excess I3 – was back-titrated with 13.82 mL of 0.07203 M Na2 S2O3 to starch indicator end point. What is the concentration of ascorbic acid in the orange juice? Report the concentration ascorbic acid in mg/100 mL.  C6H8O6 + I3 – → C6H6O6 + 3I - + 2H+  I3 – + 2S2O3 2- → S4O6 2- + 3I2  Answer: 48.5  mg/100 mL

Q: A 25 mL liquid bleach sample is diluted with water to 1000 mL in a bubble gel. 25 mL of the diluted…

A: The balanced chemical reactions are as follows: I- + OCl- + H2O = I2 + Cl- + 2OH- 2 Na2S2O3 + I2 =…

Q: In which layer can we find the methyl salicylate crude product?     aqueous layer     organic…

A: 1. Most organic compounds are soluble in organic solvent.  2. Here organic layer means layer of…

Q: When CaF2 is dissolved in water to reach saturation, the concentration of Ca2+ = 4.2 x 10-4 M. (a)…

A:

Q: Oxidation of Borneol to Camphor- Describe what makes this reacction an oxidation?

A:

Q: The illustration below shows several oxygen-dissociation curves. Assume that curve 3 corresponds to…

A:

Q: Which polymer in Problem 26.34 is the most soluble in hexane? Justify your choice.

A:

Q: The chemical method of analysis in determination of the blood alcohol content (%BAC) is: K2Cr2O7 +…

A:

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: 28. Answer ALL parts of this question. The scheme below shows a possible synthesis for the ester,…

A:

Q: What is the role of Na2CO3(aq) in the conversion of D to E? How would you test for the presence of…

A:

Q: You have isolated the enzyme sialidase from cell lysosomal extracts. This enzyme's activity is at…

A: Answer:Buffer solution is a type of solution that resists the change in its pH on adding small…

Q: c OH + CH;OH heat ? OH CH3COOH, H*, Heat Aspirin.

A: Salicylic acid produces both the oil of  wintergreen and aspirin, under different reaction. For the…

Q: Consider the following dissacharide: CH;OH H OH HOH C Но OH OH OH OH The two sugar units are…

A: Interpretation: Since the molecule given is a disaccharide .  Disaccharide is defined as when two…

Q: A stock solution contains 0.058 mM glucose. To 218 uL of this stock solution was added: 607 uL…

A: The number of moles of reaction always remains constant. Variables such as volume and concentration…

Q: Arginine has ionizable groups with pKa values of 2.17, 9.04, and 12.48. A researcher makes up 73 mL…

A: From the pKa values of arginine, it can be stated that, at pH 8.5 second proton is partially…

Q: Pkas for three titratable groups of histidine are 1.80, 6.04, and 9.33. What is the ratio of…

A: Given data:Pkas for three titratable groups of histidine are 1.80, 6.04, and 9.33To determine:The…

Q: Acetylsalicylic acid commonly known as Aspirin is used to treat fever, inflammation, and acts as a…

A:

Q: 1) If 5ml of 0.1M AgNO3 and 1.5ml of 0.25M dextrose (C6H1206) are reacted as in Equation (3), which…

A: Note: Since you have posted a question with multiple sub parts, we will provide the solution only to…

Q: Give a brief chemical structural analysis of Sildenafil citrate (viagra)with active functional…

A: Sildenafil citrate is a medicine used as a phosphodiesterase enhibitor. During sexual stimulation it…

Q: 2. What is the solubility of aqueous Ag3PO4? What is the concentration of Ag+ ions in water…

A:

Q: After digesting a 2.6824g stake sample the nitrogen is oxidized to NH4; converted to NH3 with NaOH…

A: The question is based on the concept of percentage composition. we have to calculate how much…

Q: a) Sodium acetate, CH3COONa was hydrolysed in water, H2O. Show the reaction equations involved. What…

A: The given statement is, Sodium acetate was hydrolyzed in water. For that, the corresponding reaction…

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

A: Soln

Q: A solution of 0.148 M aspartic acid, the charge neutral form of the amino acid, is titrated with…

A: The given scenario involves a titration experiment in which a solution of aspartic acid (an amino…

Q: 1. The pKa corresponding to the deprotonation of the a-amino group. 2. The pKa corresponding to the…

A: Since you have asked a question with multiple subparts, we will answer only first 3 subparts for…

Q: Calculate the pH at which the carboxyl R group of aspartic acid is 30% dissociated

A: Handerson Hasselbalch equation –  Buffer solution is mixture of weak acid and its conjugate base.…

Q: Calculate the pH at which the carboxyl R group of aspartic acid is 30% dissociated

A: Handerson Hasselbalch equation –  Buffer solution is mixture of weak acid and its conjugate base.…

Q: What happens if we over oxidize benzoin with a strong oxidizing agent like kmno4 (instead of a weak…

A:

Q: Identify all reactant combinations described below in which the 4-aminophenol is the limiting…

A:

Q: Hg2Cl2 with NH3.

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: A protein of molecular weight = 55,000 g/mol and at 1 mg/mL concentration was titrated with Ellman’s…

A:

Q: 1) Most sugars can act as reducing agents. Could the dichromate reaction shown in equation (1) be…

A: Since you have asked multiple question, we will answer the first question for you. If you want any…

Q: OH 1. CO2, aq. NAOH 2. H30+

A: This is Kolbe Schmidt reaction to convert phenol into Salicylic acid

Q: (Sodium hydroxide) + (Glyceryl stearate) 3 NaOH (aq) + (C17H35CO0)3 C3H5 (A) Write the…

A: The stoichiometry of a reaction represents the relationship between the number of moles of reactants…

Q: Salicylic acid, the active metabolite produced by the drug Aspirin, has been solated from the…

A:

Q: Arginine has ionizable groups with pKa values of 2.17 9.04, and 12.48. A researcher makes up 73 mL…

A: The question is based on the concept of PH.  It involves calculation for amino acid Arginine. we…

Potentiometric Titrations

Potentiometric titration is one of the important titration methods and is mainly carried out to characterize acid solutions. It follows a method similar to that of the normal titration technique, but the main difference is that there is no indicator used in the potentiometric titrations. Instead of using an indicator, electrodes are employed for monitoring the whole titration process. A scientist named Robert Behrend did the potentiometric titration for the first time, and it was done using the mercurous solution and potassium chloride.