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- Calculate the pH, pOH, and fraction of solute protonated or deprotonated in the following aqueous solutions: (a) 0.150 M CH3CH(OH)COOH(aq) (lactic acid), (b) 2.4 x 10-4 M CH3CH(OH)COOH(aq), (c) 0.25 M C6H5SO3H(aq) (benzenesulfonic acid). The appropriate values for pKa or pKb are given inthe table.16.The titration of an aliquot of 6 mL of acetic acid of commercial use, with NaOH 0.1 , was made by titration, so that to reach the equivalence point 40 ml of NaOH were consumed.Determine the percentage concentration (m/m) of the acetic acid, if its density is 1.05 g/ml. HC2H3O2 acetic acidCalculate MW from Average EM. MW (g/mol) = n (eq/mole) x EM (g/eq) where n is the number of H+ ions titrated per moelcule of acid TRIAL # moles of OH- # moles of H+ # equivalents H+ Equivalent Mass (g/eq) 1 0.00264 0.00264 0.00264 113.26 2 0.003295 0.003295 0.003295 91.05 113.26 + 91.05 = 204.31/2 = 102.155 g/eq average EM Acid is Sulfamic Acid
- What is the pH of the solution after mixing 0.188 g of Mg(OH)2 (MW=58.321 g/mol) with 18.1 mL of 0.0173 M HCl? The resulting solution was diluted to 100 mL. Round your calculated value for pH to two figures to the right of the decimal point.v. What is pH? Calculate the pH for 0.0001N NH4OH solution of 100mL volume. The pKb value for NH4OH at 25oC is 1.76 x 10-5.What mass of Ba(OH)2 is present in a sample if it is titrated to its equivalence point with 44.20 mL of 0.1000 N H2SO4? Note: Present complete solutions for the following problem. Express your final answers up to two (2) decimal places.
- 9. For Kw, the product of [H3O+] and [OH-] is Group of answer choices 1.0 × 10-1 1.0 1.0 × 10-14 1.0 × 1014 1.0 × 10-7 10. Which of the following statements correctly describes the hydronium-hydroxide balance in the given solution? Group of answer choices In neutral solutions, [H3O+] = [H2O] In bases, [OH-] = [H3O+] In bases, [OH-] is less than [H3O+]. In bases, [OH-] is greater than [H3O+]. In acids, [OH-] is greater than [H3O+]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?'For a 0.0448 M aqueous solution of aniline, C6H5NH2 (Kb = 7.4E-10), determine the following. Kw = 1.0E-14. a. What is the concentration of the minor species present in the solution? b. What is the concentration of the major species present in the solution? c. What is the concentration of H3O+?
- During the titration of an HClO4solution with 0.10320M NaOH, a CHEM 3A student,Juan becamedistracted and overshot the endpoint. A fellow student Pedrosuggested that he should record the present volume of NaOH added and titrate the excess with a standard acid solution. If the original sample volume was 25.000mL, the volume of NaOH added was 28.060mL. It took 3.4700 mL of 0.10940 M HCl to back-titrate the NaOH andcalculate the molar concentration of the original HClO4solution.The acid-dissociation constant for benzoic acid (C6H5COOH)is 6.3 x 10-5. Calculate the equilibrium concentrations ofH3O+, C6H5COOH-, and C6H5COOH in the solution if the initialconcentration of C6H5COOH is 0.050 M.1. A Ringer's solution consists of 140 mEq/L Na+, 5 mEq/L K+, 4 mEq/L Ca2+, and Cl-. The Cl- concentration is: ___________________ mEq/L 2. Which of the following is not correct about suspensions? a. Suspensions have very large particles that may be visible. b. The particles settle slowly upon standing c. Particles can be separated by filters d. Kaopectate and calamine lotion are suspensions e. Particles in suspension is usually smaller than 1 micrometer in diameter