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Chemistry for Engineering Students

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter12: Chemical Equilibrium

Section: Chapter Questions

Problem 12.66PAE

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Question 4
Which of the following would react most rapidly?
a. A lump of Zn in 1.0 M HCI at 40° C
Ob. Powdered Zn in 2.0 M HCI at 40° C
Oc. lump of Zn in 2.0 M HCI at 25° C
Od. Powdered Zn in 1.0 M HCI at 25° C
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Use Le Chátelier's principle to explain what happens to the equilibrium H2O(l)H+(aq)+OH(aq) when a few drops of HCl are added to pure water.
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Consider a 0.60-M solution of HC3H5O3, lactic acid (Ka = 1.4 104). a. Which of the following are major species in the solution? i. HC3H5O3 ii. C3H5O3 iii. H+ iv. H2O v. OH b. Complete the following ICE table in terms of x, the amount (mol/L) of lactic acid that dissociates to reach equilibrium. c. What is the equilibrium concentration for C3H3O3? d. Calculate the pH of the solution.
A 1.00 liter solution contains 0.59 M nitrous acid and 0.44 M sodium nitrite. If 35.0 mL of water are added to this system, indicate whether the following statements are true or false. (Note the the volume MUST CHANGE upon the addition of water.) A. The concentration of HNO2 will increase. B. The concentration of NO2- will decrease. C. The equilibrium concentration of H3O+ will increase. D. The pH will decrease. E. The ratio of [HNO2] / [NO2-] will increase.
Type your numerical answers in the box provided in three significant figures (e.g., 0.123). Do not report your answer in scientific notation. No need for units. If Canvas drops your last zero digit/s, it is OKAY. (e.g. 1.20 to 1.2). Consider a solution of 0.00500 M HBr for numbers 22-24. Determine the following: 22. equilibrium molar concentration of H3O = M. M. 23. equilibrium molar concentration of Br = %3D 24. pH =
The Ksp expression for a solution at equilibrium for the sparingly soluble salt aluminum hydroxide, Al(OH)3 is: Select one: A. Ksp = [Al*3][OH-]3 B. Ksp = [Al*3]°[OH-]3 C. Ksp = [Al*3]°[OH] D. Ksp = s3 ооо о
A 1.00 liter solution contains 0.60 moles nitrous acid and 0.46 moles potassium nitrite .If 0.23 moles of perchloric acid are added to this system, indicate whether the following statements are true or false.(Assume that the volume does not change upon the addition of perchloric acid.) A. The number of moles of HNO2 will increase. B. The number of moles of NO2- will remain the same. C. The equilibrium concentration of H3O+ will remain the same. D. The pH will increase. E. The ratio of [HNO2] / [NO2-] will increase.
1L hem101 M Inbox-elaine.mirandaperez X 9 Microsoft PowerPoint- chap X G experimento sobre ejercicio X Question 10 of 11 Determine concentration of hydroxide ion, OH-, in a solution of HNO, by constructing an ICE table, writing the equilibrium constant expression, and using this information to determine the concentration of OH-. Complete Parts 1-3 before submitting your answer. NEXT 2. A 0.60 M aqueous solution of HNO, is prepared. Fill in the ICE table with the appropriate value for each involved species to determine concentrations of all reactants and products. HNO,(aq) H,O*(aq) NO, (aq) + (1)O°H Initial (M) Change (M) Equilibrium (M) 5 RESET 0.30 X- 1.4 x 10-11 X+ 7.1 x 10-4 09'0 0.020 - 2r 1.4 x 10-11 + x 1.4 x 10-11 -r 0.60 + 2r -2r X- 09'0 +2x X+ 09°0 1.4 x 10-11 - 2r 1.4 x 10-11 + 2r ) %23 $ 9.
2. In the following reaction at equilibrium: 2CrO,? (aq, yellow) + 2 H;O* (aq) =Cr2O;?- (aq, orange) + 3 H20 (1) A. What color change do you observe when you add NaOH? B. How is this observation consistent with Le Chatlier's principle? Write the chemical equation that accounts for the change and briefly explain.
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Why is it important not to add too much HCl and go past the endpoint? O The volumne of acid added will be lower than expected for the calculations. O The color change can reverse. O The solution could bubble out of the flask. O The volume of acid added will reflect more than acid required to neutralize the base.
A 1.00 liter solution contains 0.35 M nitrous acid and 0.45 M potassium nitrite. If 0.110 moles of barium hydroxide are added to this system, indicate whether the following statements are true or false. (Assume that the volume does not change upon the addition of barium hydroxide.) A. The number of moles of HNO, will decrease. - B. The number of moles of NO," will increase. vC. The equilibrium concentration of H30* will remain the same. •D. The pH will remain the same. "E. The ratio of (HNO2] / [NO,] will remain the same. please explain each than give answer

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