A chemistry graduate student is given 250. mL of a 1.10 M trimethylamine ((CH;),N) ssolution. Trimethylamine is a weak base with K;= 7.4 x 10'. What(CH3), NHBr should the student dissolve in the(CH;),N solution to turn it into a buffer with pH = 11.41?mass ofYou may assume that the volume of the solution doesn't change when the (CH, NHBR is dissolved in it. Be sure your answer has a unit symbol, and round itto 2 significant digits.

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Answered: A chemistry graduate student is given…

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter20: Applications Of Oxidation/reduction Titrations

Section: Chapter Questions

Problem 20.26QAP

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10. 50 cm3 of 0.05 M weak acid solution is titrated with 0.1 M NaOH solution. The measured pH valuesare 7.345 and 7.497 at the consumptions of 6.0 and 6.1 cm3, respectively. What value of the buffer capacity can be calculated in the solution at pH = 7.421?11. Based on the data given in question 10, what is the total concentration of the anion of the weak acid atthe given point?
Calculate the molar solubility of BaCrO4 Barium Chromate at: • Water • 0.0500 mol.L-1 solution of the cation
(a) I f t he molar solubilit y o f CaF2 at 35 °C i s1.24 x 10-3 mol/L, what is Ksp at this temperature? (b) It isfound that 1.1 x 10-2 g SrF2 dissolves per 100 mL of aqueoussolution at 25 °C. Calculate the solubility product forSrF2. (c) The Ksp of Ba(IO3)2 at 25 °C is 6.0 x 10-10. What isthe molar solubility of Ba(IO3)2?
If 1.000ml of a solution of KMnO4 is equivalent to 0.1000mmol of sodium formate (HCO2Na) in the following titration: 2HCO2-+ 2MnO4-+ H2O → 3CO2 + 2MnO2 + 5OH-, what is the value of the KMnO4 in terms of grams of CaO in the volumetric method for calcium in which that element is precipitated as CaC2O4•H2O, the precipitate filtered and dissolved in dilute H2SO4, and the oxalate titrated with permanganate?
A stainless steel alloy is to be analyzed for its chromium content. A 3.30 g sample of the steel is used to produce 250.0 mL of a solution containing Cr2O72−. A 10.0-mL portion of this solution is added to BaCl2(aq). When the pH of the solution is properly adjusted, 0.145 g BaCrO4(s) precipitates. A.) What is the percent Cr, by mass, in the steel sample? Express your answer numerically as a percentage.
In a saturated solution of silver sulfate Ag2SO4(S), the molar solubilty is 3.6 × 10-4 mol/L. The Ksp of silver sulfate would be?
For a titration to be effective, the reaction must be rapid and the yield of the reaction must essentially be 100%. Is Kc > 1, < 1, or ≈ 1 for a titration reaction? Kc is the product of all reaction products (choose from: Multiplied by, added to, divided by, subtracted from) the product of the reactants, with all concentrations of reactants and products raised to their respective stoichiometric powers. As the titration proceeds, the amount of reactants (choose from: Increases, decreases, remains the same) and the amount of products (choose from: Increases, decreases, remains the same). Because the value of the numerator is (Choose from much greater than, much less than, approximately equal to) the value of the denominator, the value of Kc will be (Choose from much greater than, much less than, approximately equal to)1 for an effective titration reaction.
A titration curve is constructed by plotting the pH of the analyte solution versus the volume ofthe reagent added as the titration progresses. As the equivalence point is approached, there is arapid change in the pH. Titration curves enable us to explain how end points are detected andtheir relationship to equivalence points. They can also serve as guides for choosing the properindicators for a particular acid-base titration. Explain how each plot can be used to interpret the acid-base titration.
The solubility of lead (II) chloride is 1.00 g in 100 mL. 165.6 g of nitrate of Lead (II) in 900 mL and 100 mL of 1M HCl added. Will lead chloride precipitate?
Calculate the molar solubility (in mol/L) of Ag2S(s) at 25 °C in a solution of 0.30 M Na2S(aq). Ksp for Ag2S at 25 °C is 6.0x10–50
What's molar solubility of Ca(OH)2 in water using the systematic method?
Solubility tests of benzoic acid with a dissolution enthalpy of -32kJ / mol were performed at 2 different temperatures. In the first experiment carried out at 27 ° C, 5 mL of the sample taken from the benzoic acid solution is taken into 25 mL of water and titrated with 0.02M NaOH. As a result of the titration, there is a consumption of 8 mL, respectively. In the second experiment performed at a different temperature under the same conditions, 22 mL was consumed. Taking advantage of these results a) Solubility of benzoic acid at 27 ° C .................................................; b) solubility of benzoic acid at different temperature ................................................; c) second test temperature ....................................................... (M (benzoic acid): 122.12 g / mol) Note: enter only required numerical values and units in the spaces in the question.

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