The following titration curve shows the titration of triethylamine (C,H5)3N with hydrochloric acid. Which net ionic reaction explains the pH of the analyte solution before any titrant is added? 12 10 6. PH 4. 1. 10 50 mL of HCI 30 70 90 110 (CH;)3NH"(aq) + H,0(1) <=> (C,Hg)gN(aq) + H3O*(aq) O C,H;)3N(aq) + H3O*(aq) (CH5)3NH*(aq) +OH (aq) <=> (C2H5)3N(aq) + H*(aq) -> (C,H5)3NH"(aq) O H2O(1) H*(aq) + OH (aq) --> (C2H;)3N(aq) + H,0(1) <=> OH (aq) + (CH5)3NH*(aq)
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- When a drop (taken to be 0.20 cm3) of 1.0 M HCI(aq) is added to 25 cm3 of pure water, the resulting hydroniumion concentration rises to 0.0080 mol dm- 3 and so the pH changes from 7.0 t o 2.1, a big change. Now suppose the drop is added to 25 cm3 of an ethanoate buffer solution that is 0.040 MNaCH3CO2(aq) and 0.080 M CH3COOH(aq). What will be the change in pH?The concentration of Cl– in a 300.0-mL sample of water drawn from a fresh water acquifer suffering from encroachment of sea water, was determined by titrating with 0.0516 M Hg(NO3)2. The sample was acidified and titrated to the diphenylcarbazone end point, requiring 6.18 mL of the titrant. Report the concentration of Cl–in parts per millionYou have performed an iodimetric titration using a commercial vitamin C tablet. Based on the following information below, calculate the %(w/w) of vitamin C(MM=176.16 g/mol) in the tablet: Mass of tablet dissolved in 250.0 mL: 5.422 g Aliquot volume of sample titrated: 25.00 mL Concentration of KIO3: 0.023 M Final burrette volume: 41.31 mL Initial burrette volume: 8.89 mL Blank volume: 0.14 mL
- ) A truck driver carrying a load of lead nitrate (Pb(NO3)2) lost control of his semi- truck after hitting a patch of ice and crashed the truck into Blue Lake, which was right next to the highway. Despite the best efforts of the emergency workers, several of the crates containing lead nitrate were damaged, and the highly soluble compound dissolved immediately. Assuming the lake is initially at circumneutral pH (7), and that the spill resulted the in a total lead concentration of 10-3 M within the lake. Based on the following information, will PbO(s) precipitate out of Blue Lake. Assume all lead nitrate dissociates into Pb+2 and NO3-, no other sources of lead exist in the lake and that no other reactions besides the equations shown below occur. PbO(s) + 2H+ ⇌ PbO(s) + H+ ⇌ PbO(s) + H2O ⇌ PbO(s) + 2H2O ⇌ Pb2+ + H2O PbOH+ + H2O Pb(OH)2o Pb(OH)3- + H+ logKs0/ksp =14 logK1=3.4 logK2=-0.5 logK3=-12The protein content of wheat flour can be determined reasonably accurately by multiplying the percentage of nitrogen present by 5.7. A 2.06-g sample of flour was taken through a Kjeldahl procedure and the ammonia produced was distilled into a boric acid solution. If this solution required 34.70 mL of 0.174 N HCl for titration to the methyl red end point, what is the a) % Nitrogen and b) % protein in the flour? (Use 1:1 stoich ratio between N and HCl)The Tris buffer system is commonly used in biochemistry as its pKa of 8.1 allows it to buffer close to physiological pH. (CH2OH)3CNH2 + H+ Û (CH2OH)3CNH3+ What concentrations of Tris and Tris H+ are obtained in a 200 mL solution at pH 8.20 containing 6.1g of Tris? The molecular mass of Tris is 121.1 gmol-1 Please do this step by step thank you!
- The liquid part of the Moderna vaccine contains a Tris (tromethamine) buffer. The purpose of the buffer is to make the pH level of the vaccine near to that of the human body and also to maintain the integrity of the mRNA component.In a laboratory scale, a biochemist was asked to study the structure of the mRNA component of the Moderna vaccine. To do so, they need to first prepare 500.0 mL of 1.000 M of the Tris buffer solution of pH 7.5000. The available reagents in the lab are the following:Tris base MW = 121.14 g/mol pKa = 8.07Tris-HCl MW = 157.56 g/mol Calculate the amounts of tris base and tris-HCl needed to prepare the buffer solution.A 10.00cm3 portion of the 100.00cm3 HCl solut was taken from the volumetric flask and was titrated with KOH (aq). It was neeutralized by 24.35cm3 of potassium hydroxide od concentration 0.0500moldm-3. Calculate the concentrat of the original concentrated hydrochloric acid in moldm-3.For the synthesis of maroon dye, Taylor needs to use a primary amine with a pH between 3.00 and 4.00 for optimum yield. In one of her trials, she dissolved 8.22 g of anilinium chloride, C6H5NH3Cl (MM = 129.58 g/mol) in distilled water to make 250.0 mL solution. Given that Kb of aniline (C6H5NH2) is 4.29 x 10-10, calculate the pH of the salt solution. Yes or No. Will Taylor obtain high yield of maroon using C6H5NH3Cl?'
- Ammonium acetate buffer is used as an important reagent for studying molecular biology, biological buffers, reagents and DNA and RNA purification. Ammonium acetate (0.24M) in combination with cold 66% (v/v) ethanol quantitatively precipitated RNA from very dilute solutions (greater than or equal to μg/ml) after centrifugation. Ammonium acetate (CH3COONH4) is also a salt of weak acid (CH3COOH) and weak base (NH4OH). The Ka and Kb are equal to 1.8 x10-5. The pH of this salt solution will be, a. pH > 7 b. pH ≈ 7 c. pH < 7 d. both cation and anion don’t hydrolyze. e. none of the above.Following titration analysis, a sample of a fruit juice was found to contain 8.9 mg cm-3 ascorbic acid. Given that the Mr value for ascorbic acid is 176.1 Da, calculate the value of the ascorbic acid concentration expressed in units of mmols dm-3 then enter itProperties of a Buffer The amino acid glycine is often used as the main ingredient of a buffer in biochemical experiments. The amino group of glycine, which has a of 9.6, can exist either in the protonated form or as the free base , because of the reversible equilibrium In what pH range can glycine be used as an effective buffer due to its amino group? In a 0.1 m solution of glycine at pH 9.0, what fraction of glycine has its amino group in the form? How much 5 m KOH must be added to 1.0 L of 0.1 m glycine at pH 9.0 to bring its pH to exactly 10.0? When 99% of the glycine is in its form, what is the numerical relation between the pH of the solution and the of the amino group? Please answer all of these questions, especially C please write in detail.