Study Guides (248,398)
United States (123,373)
Chemistry (86)
CHM 2046 (54)
Christou (32)
Final

Martin Exam II Spring 2009.pdf

2 Pages
137 Views
Unlock Document

Department
Chemistry
Course
CHM 2046
Professor
Christou
Semester
Spring

Description
CHM 2046 EXAM 2 FORM CODE B 3/4/2009 Please bubble in your name, UFID #, and form code on the answer sheet using a #2 pencil. 1. Which of the following solutions will NOT be a buffer? (a) 0.60 M NaH PO 2 0.64 M Na HPO 2 4 (b) 0.30 M HNO / 0.35 M NaNO 3 (c) 0.50 M NH Cl / 0.24 M NaOH 4 (d) 0.32 M HCl / 0.60 M potassium acetate (KCH COO) 3 (e) 0.45 M HOCl / 0.50 M KOCl 2. You need a buffer of pH 3.15. Which weak acid would be the best choice for making your buffer? (a) HOCl (b) HF (c) HOCN (d) NH 4 (e) CH 3OOH 3. Calculate the solubility of magnesium carbonate, MgCO . 3 (a) 0.795 g/L (b) 6.30×10 g/L (c) 0.0342 g/L (d) 0.533 g/L (e) 2.88 g/L - 4. You make 500 mL of a 0.50 M HZ / 0.30 M Z buffer (where HZ is a hypothetical weak acid) and find it to have a pH of 8.0. What is the K ofbZ ? - -6 -9 (a) 7.77 (b) 8.22 (c) 0.915 (d) 1.67×10 (e) 6.02×10 5. What is the change in pH that results from adding 0.0060 mol HCl to a 300 mL buffer solution that is 0.250 M CH COO3 and 0.560 M NaCH COO? 3 (a) +0.052 (b) -0.052 (c) +0.049 (d) -0.049 (e) -0.015 6. How many grams of NaCH COO sho3ld you dissolve into 2.0 L in order to obtain a solution which has pH 8.00? (a) 2.77×10 g5 (b) 0.105 g (c) 0.211 g (d) 1.99×10 g-5 (e) 0.293 g 7. Calculate the value of the solubility product, K fospcalcium phosphate, Ca (PO ) 3 4 2 (a) 3.96×10 -26 (b) 1.2×10 -26 (c) 3.0×10 -27 (d) 1.1×10 -28 (e) 8.96×10 -28 In answering Questions 8 and 9, consider the following titration curve. Volume of titrant added (mL) 8. Which one of the following combinations does the titration curve represent? (a) Addition of a strong base to a weak acid (b) Addition of a weak base to a strong acid (c) Addition of a weak acid to a strong base (d) Addition of a strong acid to a strong base (e) Addition of a strong acid to a weak base 9. What is the value of the pK that can be obtained from this titration curve? a (a) 11.3 (b) 10.0 (c) 9.3 (d) 5.3 (e) 1.8 10. When dissolved in water, Fe(NO ) forms the weak monoprotic acid Fe(H O) 3+. Its conjugate base is 2+ 3 3 2 6 Fe(H 2) (5H) . What will be the pH of a 0.050 M solution of Fe(NO ) ? 3 3 (a) 1.85 (b) 1.91 (c) 3.70 (d) 4.53 (e) 6.71 -3 11. Calculate the solubility of silver iodide (AgI) in a 4.7×10 M silver nitrate (AgNO ) solu3ion. (a) 4.16×10 -12g/L (b) 1.77×10 -14g/L (c
More Less

Related notes for CHM 2046

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit