Chem 152 HW 4 5 6 - HW 4 1.3.42/3.84 pointsAll Submissions...

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

View Full Document Right Arrow Icon
HW 4 1. 3.42/3.84 points All Submissions Notes Question: ZumChemP6 11.E.018. Calculate  ° values for the following cells. Which reactions are spontaneous as written  (under standard conditions)? Balance the reactions. Standard reduction potentials are found  in the  table . (Use the lowest possible coefficients. Include states-of-matter under the given  conditions in your answer.) (a) MnO 4 ( aq ) + I  ( aq  I 2 ( aq ) + Mn 2+ ( aq ) °= .97 0.97 V  spontaneous  reaction 10I - ( aq ) + 2MnO 4 - ( aq ) + 16H + ( aq )     2Mn 2+ ( aq ) + 8H 2 O( l ) + 5I 2 ( aq ) 16 H + ( aq ) + 2 MnO  - 4 ( aq ) + 10 I - ( aq )     5 I 2 ( aq ) + 2 Mn 2+ ( aq ) + 8 H 2 O( l )   Correct. (b) H 2 ( g  H + ( aq ) + H  ( aq ) ° = -2.23  -2.23 V spontaneous reaction H 2 ( g )     H + ( aq ) + H - ( aq ) H 2 ( g )     H + ( aq ) + H - ( aq )   Correct. (c) Au 3+ ( aq ) + Ag( s  Ag + ( aq ) + Au( s ) °= .70  0.7  V spontaneous  reaction Au 3+ ( aq ) + 3Ag( s )     Au( s ) + 3Ag + ( aq ) Au 3+ ( aq ) + 3 Ag( s )     Au( s ) + 3 Ag + ( aq )   Correct.   2. 3.84/3.84 points All Submissions Notes Question: ZumChemP6 11.E.020. Consider the following galvanic cells.
Background image of page 1

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

View Full DocumentRight Arrow Icon
For each galvanic cell, give the balanced cell reaction and determine  °. Standard  reduction potentials are found in the  table . (Use the lowest possible coefficients. Include  states-of-matter under SATP conditions in your answer.) (a) reaction  Au 3+ ( aq ) + 3Cu 1+ ( aq )     Au( s ) + 3Cu 2+ ( aq ) Au 3+ ( aq ) + 3 Cu + ( aq )     Au( s ) + 3 Cu 2+ ( aq )   Correct. ° = 1.34   1.34  V  (b) reaction  2VO 2 + ( aq ) + 4H + ( aq ) + Cd( s )     Cd 2+ ( aq ) + 2VO 2+ ( aq ) + 2H 2 O( l ) 2 VO 2 + ( aq ) + 4 H + ( aq ) + Cd( s )     2 VO 2+ ( aq ) + 2 H 2 O( l ) + Cd 2+ ( aq )   Correct. ° = 1.40   1.4 V 3. 3.46/3.84 points All Submissions Notes Question: ZumChemP6 11.E.022. The saturated calomel electrode, abbreviated SCE, is often used as a reference electrode in  making electrochemical measurements. The SCE is composed of mercury in contact with a  saturated solution of calomel (Hg 2 Cl 2 ). The electrolyte solution is saturated KCl.  SCE  is  +0.242 V relative to the standard hydrogen electrode. Calculate the potential for each of the  following galvanic cells containing a saturated calomel electrode and the given half-cell  components at standard conditions. In each case, indicate whether the SCE is the cathode  or the anode. Standard reduction potentials are found in  Table 11.1 . (a) Cu
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/08/2012 for the course CHEM 152 taught by Professor Chiu during the Spring '08 term at University of Washington.

Page1 / 14

Chem 152 HW 4 5 6 - HW 4 1.3.42/3.84 pointsAll Submissions...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online