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- Three students titrate different samples of the same solution of HCI to obtain its molarity. Below are their data. Student A: 20.00mLHCl+20.00mLH2O 0.100 M NaOH used to titrate to the equivalence point Student B: 20.00mLHCl+40.00mLH2O 0.100 M NaOH used to titrate to the equivalence point Student C: 20.00mLHCl+20.00mLH2O 0.100 M Ba(OH)2 used to titrate to the equivalence point. All the students calculated the molarities correctly. Which (if any) of the following statements are true? (a) The molarity calculated by A is half that calculated by B. (b) The molarity calculated by A is equal to that calculated by C. (c) The molarity calculated by B is twice that calculated by C. (d) The molarity calculated by A is twice that calculated by B. (e) The molarity calculated by A is equal to that calculated by B.This question is about acid base titration: Osama a student, performed an acid base titration involving a standard solution of Sodium hydroxide (NaOH) (RMM = 40) against unknown HCl solution and obtained the following results. Mass of Sodium hydroxide (NaOH) dissolved in 250 ml volumetric flask = 3.6 g 2.Volume of Sodium hydroxide used in the titration = 23 ml 3.The mean volume of HCl titrated with 25 ml Sodium…5mL of 0.150 M ammonia (NH3) is titrated with 0.100 M hydrochloric acid (HCl) The Kb for ammonia is 1.75 x 10-5 1)Write a balanced chemical equation for the reaction of ammonia and hydrochloric acid and a balanced chemical equation for the equilibrium of ammonia in water. 2) What is the pH of the ammonia solution prior to the addition of any HCl?
- For the titration of sulfuric acid (H2SO4) with sodium hydroxide (N2OH), how many moles of sodium hydroxide would be required to react with 1.00 L of 0.500 M sulfuric acid to reach the endpoint?You have a 18 mL sample of acetylcholine (a neurotransmitter) with an unknown concentration and a pH of 8.35. You incubate this sample with the enzyme acetylcholinesterase to convert all of the acetylcholine to choline and acetic acid. The acetic acid dissociates to yield acetate and hydrogen ions. At the end of the incubation period, you measure the pH again and find that it has decreased to 6.03. Assuming there was no buffer in the assay mixture, determine the number of nanomoles of acetylcholine in the original 18 mL sample.From the given situations, explain whether its solution requires a qualitative analysis or quantitative analysis. The wine from a well-known brand does not come from Italy, contrary to its label. The residents of a major subdivision in Iloilo near a waste disposal site are concerned that leaking contaminants into their groundwater is dangerous. A local plant is studied as a cure for coronavirus.
- A student titrated 28.32 ml of a 0.118 M HCl solution with a NaOH solution of unknown concentration. After adding 36.35 ml of NaOH solution, the student realized that she had neglected to add the phenolphthalein indicator solution before starting the titration. When he/she added the phenolphthalein solution, the titration mixture turned bright pink. The student added 4.47 ml of HCl solution to cause the titration mixture to just become colorless. What is the molarity of the NaOH solution? (Put your answer in 3 significant figures)You have a 16 mL sample of acetylcholine (a neurotransmitter) with an unknown concentration and a pH of 7.66. You incubate this sample with the enzyme acetylcholinesterase to convert all of the acetylcholine to choline and acetic acid. The acetic acid dissociates to yield acetate and hydrogen ions. At the end of the incubation period, you measure the pH again and find that it has decreased to 5.52. Assuming there was no buffer in the assay mixture, determine the number of nanomoles of acetylcholine in the original 16 mL sample. Acetylcholine CH₂ acetycholine in original sample: CH,—C−O−CH,—CH,AN-CH, HO–CH,—CH,*N–CH, + CHy H₂O I CH3 CH3 Choline CH₂ CH,-GO + H Acetate nmol5. A typical aspirin tablet contains 325mg of acetylsalicylic acid (HC9H704) which is a weak acid. The Ka of this acid is 3.69 x 10-4. a. Give the equation for dissociation of the weak acid HC9H7O4. b. What is the initial concentration, in units of molarity, of acetylsalicylic acid if 2 tablets are dissolved in 500. mL of water? c. What is the equilibrium concentration of all species of this solution of acetylsalicylic acid? d. What is the pH, pOH, and % ionization of this solution?
- Suppose you are asked to prepare a buffer solution for an upcoming experiment using stock solutions of the weak acid and its conjugate base. Use the following information to determine the volumes of weak acid, conjugate base and distilled water you will need to make the buffer solution: You have 1.0 M stock sodium hydrogencarbonate (NaHCO3) solution, pKa=10.33 You also have 1.0 M stock disodium carbonate (NaCO3) solution The final buffer solution should have a concentration of 80 mM, a volume of 500 mL, and a pH of 9.60 First, use the HH equation to calculate the ratio of the two stock solutions you will need to mix together to reach the target pH, and report this ratio. Next, calculate and report the volumes of weak acid, conjugate base and dH2O you will need to prepare the buffer. No sample calculation is necessary. Hints: • Calculate the volume of distilled water by considering the HA and A- stock solutions as a single mixture of 1.0 M buffer. This way, it's easier to calculate the…You have a 15 mL sample of acetylcholine (a neurotransmitter) with an unknown concentration and a pH of 8.06. You incubate this sample with the enzyme acetylcholinesterase to convert all of the acetylcholine to choline and acetic acid. The acetic acid dissociates to yield acetate and hydrogen ions. At the end of the incubation period, you measure the pH again and find that it has decreased to 5.91. Assuming there was no buffer in the assay mixture, determine the number of nanomoles of acetylcholine in the original 15 mL sample. O= CH3 Acetylcholine H₂O CH,—C−O−CH,—CH,—*N-CH, → HO−CH,—CH,—*N–CH, + CH,—C−O + H* CH3 CH 3 Choline CH3 AcetateTo best accurately determine the molarity of a base, a scientist would need the following: An Erlenmeyer flask, a weighed solid primary standard acid, and NaOH A buret, a weighed solid monobasic base, and an indicator A buret, a weighed solid primary standard acid, and an indicator A buret, a weighed solid primary standard acid, and NaOH A graduated cylinder, a weighed solid primary standard acid, and an indicator