Course Hero Logo

Exam 3 SP_08 - Chem 112 Exam 3 SP 2008 Name _ Multiple...

Course Hero uses AI to attempt to automatically extract content from documents to surface to you and others so you can study better, e.g., in search results, to enrich docs, and more. This preview shows page 1 - 3 out of 9 pages.

Chem 112Exam 3SP 2008Name _______________________Multiple choice.6 pointseach. Partial credit may be awarded if some work or comments are shown.Assume 25oC, aqueous solutions and Kw=1.00 x 10−14unless otherwise stated.1. Hydrofluoric acid, HF, is a weak acid with Ka=6.8 x 10−4.Calculate the pH of a 0.200 M solution ofHF.a)0.70b)1.17c)1.93d)3.17e)7.00
2.At a temperature where Kwis 1.4 x 10−13, a solution has a pH of 7.00.What is true of this solution?(circle all that apply)C.
3. A 0.00100 M solution of lactic acid is prepared in ultrapure water. From high precision conductivitymeasurements, the acid is found to be 30.90 % ionized. What is the Kafor lactic acid?
4.A buffer is to be prepared using acetic acid and sodium acetate to a target pH = 5.10.What ratio of theconjugate−base to conjugate−acid must be used to achieve this pH?Kafor acetic acid is 1.75 x 10−5.9.80
5. At equilibrium in a reaction, which of the following statements must be true?a)the rate of the forward reaction has reached a maximumb)no reaction is occurringc)the rate constants of the forward and reverse reactions must be equald)there are more products than reactantse)there is no net change in the amount of any reactant or product
We have textbook solutions for you!
/Fundamentals-of-Analytical-Chemistry-9th-Edition-9780495558286-1169/
The document you are viewing contains questions related to this textbook.
Chapter 14 / Exercise 14-7
Fundamentals of Analytical Chemistry
Skoog/West
Expert Verified
6. Kbfor a certain weak organic base is 5.72 x 10-6.What is Kafor its conjugate acid at a temperaturewhere Kw= 5.01 x 10-13?7
7. Which of the following represents an acid and its conjugate base (conjugate acid/base pair)?-2
8.The following reaction has Keq=4.91 x 103for the temperature at which it is occurring, in a 1.00 Lvessel.From the instantaneous concentrations shown, predict what will be observed over time.2 Al (s)+6 OH− (aq)2 AlO33−(aq)+3 HInstantaneous amounts:0.050 mol0.0112 mol5.49x10−3mol0.0125 mol2(g)

Upload your study docs or become a

Course Hero member to access this document

Upload your study docs or become a

Course Hero member to access this document

End of preview. Want to read all 9 pages?

Upload your study docs or become a

Course Hero member to access this document

Term
Spring
Professor
LEMASTER
Tags
Chemistry, pH, Weak acid, kw
We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
Fundamentals of Analytical Chemistry
The document you are viewing contains questions related to this textbook.
Chapter 14 / Exercise 14-7
Fundamentals of Analytical Chemistry
Skoog/West
Expert Verified

Newly uploaded documents

Show More

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture