By mistake a chloride determination by Mohrs method is carried out in ph 2. Will the result be high or low, will the error not affect the result?Explain with reason.
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By mistake a chloride determination by Mohrs method is carried out in ph 2. Will the result be high or low, will the error not affect the result?Explain with reason.
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- 9. An aqueous solution of sulfuric acid is prepared by mixing a secondary standard of sulfuric acid with deionized water. The aforementioned acid is to be used as a titrant hence its concentration must be accurately determined. To do this, Engr. Polinar, standardized the titrant by titrating two liters of ammonia at 0.90 atm and 30 deg C. From the experiment, 134 mL of the titrant was necessary to neutralize the ammonia. Determine the concentration of the acid in terms of normality? 10. Engr. Forcadela is optimizing a plastic formulation by manipulating the phosgene concentration injected as a gas during the reaction. To obtain credible results, he considered the propensity of phosgene to dissociate into carbon monoxide and chlorine gas at 395 deg C. Performing an experiment at the aforementioned temperature, an equilibrium is reached amongst the species where the total pressure is at 3 atm. If the equilibrium constant expression in terms of concentration for the reaction at 395 deg C…Calculate the value of Q if mixture contains 0.21 M SO,, 0.19 M 02, and 0.42 M SO,The course is specifically quantitative analysis, I figured that would just fall under chemistry. The issue I'm having with this one is that I have absolutely no idea how to even begin. I figure benzoic acid wouldn't affect the pH of NaOH that much since it's a weak acid and NaOH is a strong base, but I don't think it'd be right to just take the pH using solely the concentration of NaOH. What approach should I take to solve this? 220 mL of 0.03 M NaOH were added to 200 mL of 0.03 M benzoic acid (pKa = 4.2). What is the pH of the resulting solution?
- 1. Amino acids are the building blocks of proteins. The simplest amino acid is glycine, NH2CH2CO2H. There are three forms in equilibrium with one another. +NH3CH2CO2H(aq) + H2O(l)↔+NH3CH2CO2-(aq) + H3O+(aq) Ka = 4.5 x 10-3 +NH3CH2CO2-(aq) + H2O(l)↔ NH2CH2CO2-(aq) + H3O+(aq) Ka = 1.7 x 10-10 If the pH of a natural system (i.e. your body) is 7.2, in what form is the amino acid found? Justify your answer both with rational as well as a quantitative rationale. 2. Sulfanilic acid, which is used in making dyes, is made by reacting aniline with sulfuric acid: H2SO4(aq) + C6H5NH2(aq)→ + H2O(l) a) If you want to prepare 150.0 g of sulfanilic acid, and you expect only an 85% yield, how many milliliters of aniline should you take as a starting material? (ρaniline = 1.02 g/ml) b) Give the approximate values for the following bond angles in sulfanilic acid: A ______B ______ C ______D _______ c)Give the appropriate hybridization for the following atoms in sulfanilic acid:A ______B ______ C ______D…Cite one reason for the difference between the theoretical (calculated) pH and the experimental pH.O Ni(H₂O)2+ (aq) + 3SCN- (aq) = Ni(SCN); (aq) + 6H₂0(1) (a) Write the Kc expression for this equilibrium. (b) Would there be a shift to the right or to the left if KSCN solution was added to a solution containing this equilibrium? Explain your answer.
- 5. From the stock solutions of 1.00-mol L acetic acid and 1.00-mol L of sodium acetate, six solutions were prepared with the acetic acid and acetate concentrations shown in the table below. The pk of acetic acid is 4.756. [Acetic acid). [Acetate). Final volume, Solutio mol L mol L ml A. 0.10 100 0.0000351 100 0.10 0.10 100 0.010 0.010 100 0.10 0.15 100 0.15 0.10 100 -1 Determine the volume of the stock solutions of 1.00-mol Lacetic acid and 1.00-mol L of sodium acetate needed to prepare the solutions. Write your answer in the table below. a. Vol. acetic acid, ml Vol. of acetate, ml Solution A b. Calculate for the initial pH of the solutions and write the pH in the table below. Solution Initial pH A Which solution(s) have the same pH? C.Write the Ksp expression for the sparingly soluble compound silver cyanide, AgCN. If either the numerator or denominator is 1, please enter 1. Ksp = Submit Answer Retry Entire Group 8 more group attempts remainingThe undissociated base (B) is present in the greatest concentration, with the products being present in relatively smaller amounts in this equilibrium mixture. How would this affect the magnitude of Kb? Do you expect it to be small or large? Which is the strongest base? Name of base Ammonia (NH3) Methylamine (CH3NH2) Ethylamine (C2H5NH2) Diethylamine (C2H5)2NH Pyridine (CSH5N) Kb value 1.76 x 10-5 Why? 4.4 x 10-4 5.6 x 10-4 Which is the weakest base? 1.3 x 10-3 1.7 x 10-9 Why? The larger the Kb the (stronger/weaker) the base. Since a weak base dissociates incompletely setting up an equilibrium, what method could you think of that you could use to determine the concentration of [OH"] ions given the initial concentration of the acid and its Kb?
- When using a Gran plot to determine the equivalence point, we must use the data after the equivalence point. Group of answer choices True FalseWrite the Ksp expression for the sparingly soluble compound barium phosphate, Baz(PO4)2. Ksp = A₂ If either the numerator or denominator is 1, please enter 1Please hep with 1-3. thanks 1. In the laboratory, a general chemistry student measured the pt of a 041 M aqueous solution of hydrocyanic acid to be 4.891. Use the information she obtained to determine the K, for this acid. K,(experiment)-( In the laboratory, a general chemistry student measured the pH of a 0.582 M aqueous solution of hydrofluoric acid to be 1.704. Use the information she obtained to determine the K, for this acid. K,(experiment) = 3. In the laboratory, a general chemistry student measured the pH of a 0.474 M aqueous solution of hydrecyanic acid to be 4.879. Use the information she obtained to determine the K, for this acid. K,(experiment) = [ 2.