{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Ex3_S06_ans - Name_A Key Chem 114 Exam 3 Total Points = 105...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Name ___A. Key________ Problem Session _All__ Chem 114 Exam 3 Dr. A. H. Martin Total Points = 105 March 24, 2006 Calculations must be shown for credit on ALL problems, and ALL dependent variables, i.e. x's, must be defined. (8)1. Indicate whether aqueous solutions of the following salts are Acidic , Basic , or Neutral . For each nonneutral salt, also give the chemical formula of the ion that causes the shift from neutrality. acidic, basic, or neutral ion causing change KHCO 3 ___basic_________ ____HCO 3 1- _________ C 2 H 5 NH 3 Br ___acidic__________________ _____C 2 H 5 NH 3 1+ _____ NaClO 4 ___neutral____________ ____neither_________ Ti(NO 3 ) 3 __acidic_____________ _____Ti 3+ ____________ (2) 2. Give equilibrium equation and equilibrium constant expression for the K sp for Fe 3 (PO 4 ) 2 . Fe 3 (PO 4 ) 2 3 Fe 2+ + 2 PO 4 3- K sp = [Fe 2+ ] 3 [PO 4 3- ] 2 (3) 3. Give the net ionic equation for the hydrolysis of the salt CH 3 NH 3 NO 3 . CH 3 NH 3 NO 3 CH 3 NH 3 1+ + NO 3 1- CH 3 NH 3 1+ CH 3 NH 2 + H 1+ (15) 4. A buffer solution is 0.70 M in HOCN and 0.50 M in NaOCN. Answer the following based on this buffer. (For HOCN K a = 3.5x10 -4 ) a) Give the chemical formula of the base form of the buffer. __OCN 1- ___________ b) Give the chemical formula for the acid form of the buffer. _____ HOCN _______________ c) Give the net ionic equation for the reaction of the buffer with Ca(OH) 2 . HOCN + OH 1- OCN 1- + H 2 O d) Give the net ionic equation for the reaction of the buffer with HI. OCN 1- + H 1+ HOCN e) Calculate the pH of the buffer. (Show your calculations.) πΗ = πΚ α + λογ [ΟΧΝ 1- ] [ΗΟΧΝ] = - λογ3.5ξ10 -4 + λογ (0.50 29 (0.70 29 pH = 3.47 + (-0.14) = 3.32
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Chem 114 Exam 3 Page 2 (15) 5. Indicate how you would distinguish between aqueous solutions of the following ions with ONE SIMPLE TEST .
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern