Chemistry: An Atoms-Focused Approach
14th Edition
ISBN: 9780393912340
Author: Thomas R. Gilbert, Rein V. Kirss, Natalie Foster
Publisher: W. W. Norton & Company
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- 3
A chemistry graduate student is given 100. mL of a 0.30M diethylamine ((C,H,) NH) solution. Diethylamine is a weak base with K,= 1.3 × 10 °. what
mass of (C,H5) NH,Br should the student dissolve in the (C,H,), NH solution to turn it into a buffer with pH = 10.94?
2
You may assume that the volume of the solution doesn't change when the (C,H,) NH,Br is dissolved in it. Be sure your answer has a unit symbol, and round
2
it to 2 significant digits.
Q4.
Calculate the pH of 1.00 L of the buffer 0.98 M CH3COONa/0.98 M CH3COOH after the
addition of the following species. Ka for CH;COOH =1.8 x 10 (SHOW YOUR WORK)
(a) pH after addition of 0.050 mol NaOH
(b) pH after the addition of 0.138 mol HCI
Chapter 15 Solutions
Chemistry: An Atoms-Focused Approach
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- Suppose the molar solubility of MgCO3 in water is x M, while its molar solubility in a 0.5 M solution of MgCl, is y M. Which of the following is correct? Ox=y O x >y Oxarrow_forward5arrow_forward-4 What A chemistry graduate student is given 100. mL of a 1.10 M trimethylamine ((CH,) N) solution. Trimethylamine is a weak base with K, = 7.4 x 10 mass of (CH, NHB1 should the student dissolve in the (CH, N solution to turn it into a buffer with pH = 10.56? You may assume that the volume of the solution doesn't change when the (CH, NHB is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.arrow_forward4. What is the pH at each of the following points in the titration of 25.00 mL of 0.100 M CH,CH;COOH with 0.100 M NaOH? a) before the addition of any NaOH; b) after the addition of 10.00 mL of 0.100 M NaOH; c) after the addition of 12.50 mL of 0.100 M NaOH; d) after the addition of 25.00 mL of 0.100 M NaOH; e) after the addition of 26.00 mL of 0.100 M NaOH.arrow_forward3 points (I): What molar ratio of benzoate ion to benzoic acid would be required to prepare a buffer with a pH of 5.20? Kaof C6H5COOH = 6.5 x 1-5arrow_forward1. For the reaction: PbCl2(s) ↔ Pb2+(aq)+2Cl1-(aq), what is Q* when 8.0 mL of 0.054 M lead nitrate is added to 21 mL of 0.025 M sodium chloride? Ksp of lead chloride is 1.6 x 10-5 M3. *Recall: Q is compared to Ksp to determine whether a precipitate forms. 2.Sodium phosphate is added to a solution that contains 0.0088 M aluminum nitrate and 0.046 M calcium chloride. The concentration of the first ion to precipitate (either Al3+ or Ca2+) decreases as its precipitate forms. What is the concentration of this ion when the second ion begins to precipitate?arrow_forwardFor 500.0 mLmL of a buffer solution that is 0.165 M� in CH3CH2NH2CH3CH2NH2 and 0.100 M� in CH3CH2NH3ClCH3CH2NH3Cl, calculate the initial pHpH and the final pHpH after adding 1.8×10−2 molmol of HClHCl. ( Kb(CH3CH2NH2)=5.6×10−4�b(CH3CH2NH2)=5.6×10−4.) Express your answers using two decimal places separated by a comma. pHinitial,pHfinal =arrow_forwardAn industrial chemist studying bleaching and sterilizing pre-pares several hypochlorite buffers. Find the pH of (a) 0.100 M HClO and 0.100 M NaClO; (b) 0.100 M HClO and 0.150 M NaClO; (c) 0.150 M HClO and 0.100 M NaClO; (d) 1.0 L of the solution in part (a) after 0.0050 mol of NaOH has been added.arrow_forwardThis question is about a buffer solution made by mixing together solutions containing ethanoic acid and sodium ethanoate. H3C HO, H3C O`Na* H3C O Nat HO a) If you add a small amount of an acid such as dilute hydrochloric acid to this, the pH doesn't change much. Explain what happens to the extra hydrogen ions you have added. b) If you add a small amount of an alkali such as sodium hydroxide solution to the buffer solution, again the pH doesn't change much. There are two ways in which the extra hydroxide ions can be removed. What are they? 10:2 11/28 hp fg f9 toarrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
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Precipitation Reactions: Crash Course Chemistry #9; Author: Crash Course;https://www.youtube.com/watch?v=IIu16dy3ThI;License: Standard YouTube License, CC-BY