Poll

Do you trust the mainstream media?
  • 100% of the time
  • 75% of the time
  • 50% of the time
  • 25% of the time
  • Never
If you would like to vote in this poll, please login or register.
New Topic  
SakurasFlowers
wrote...
6 years ago
How to write net ionic equations for basic and acidic solutions?
Write a balanced net ionic equation for the following reaction in basic solution:

1 ) Zn(s) + NO3- (aq) -> NH3(aq) + Zn(OH)4^(2-)

Write a balanced net ionic equation for the following reaction in acidic solution:

2 ) Mg(s) + VO4^(3-)(aq) -> Mg^(2+)(aq) + V^(2+)

3 ) PbO2(s) + CI-(aq) -> PbCI2(s) + O2(g)
  • Read 6167 times
  • 2 Replies
wrote...
*
*
6 years ago
Zn ------> Zn+2 & 2 electrons lost

(NO3)- & 8 electrons taken ------> (NH4)+
(N+5 in nitrate goes to N-3 in ammonium)

four times the Zn reaction to balance the electrons taken & lost:
4Zn ------> 4Zn+2 & 8 e-
(NO3)- & 8 e- ------> (NH4)+

combine the two 1/2 reactions:
4 Zn & (NO3)-1 ---> 4 Zn+2 & (NH4)+1

we need to balance the charges on both sides: -1 Rightwards Arrow +9,....add 10 (OH-)'s to the right side & you will have 1- Rightwards Arrow -1 :
4 Zn & (NO3)-1 ---> 4 Zn+2 & (NH4)+1 & 10 OH-

balance the H's using neutral water:
4 Zn & (NO3)-1 & 7 H2O ---> 4 Zn+2 & (NH4)+1 & 10 OH-

Also, here is a set-by-set way of doing them:

you can get answers or check answers to balanced redox reactions by going to this site!
wrote...
*
6 years ago
Mg (s) + VO43- (aq) Rightwards Arrow Mg2+ (aq) + V2+ (aq) (Base)
Mg Rightwards Arrow Mg2+ + 2 e-                 x3
3 e- + 8 H+ + VO43- Rightwards Arrow V2+ + 4 H2O              x2
3Mg Rightwards Arrow 3Mg2+ + 6 e-
6 e- + 16 H+ + 2 VO43- Rightwards Arrow 2 V2+ + 8 H2O
3Mg + 16 H+ + 2 VO43- Rightwards Arrow 3Mg2+ + 2 V2+ + 8 H2O + 16 OH-          on both sides

3Mg + 8 H2O + 2 VO43- Rightwards Arrow 3Mg2+ + 2 V2+ + 16 OH
✓ Don't be mean, we need followers on Twitter too! Slight Smile
New Topic      
Related Topics
This topic is currently locked from adding new posts. Only administrators and moderators can reply. If you'd like to contribute to this topic, start a new thread and make reference to this one. Otherwise, contact a moderator for more options.

Control Panel

Click to Ask a Question
690 Students and 62 members are standing by to answer your homework problems, free. So far today, 324 guests have joined.
Ask a Question Add Gallery Image Add New Term
Dictionary
Search Images
Free PubMed Mathematics Tools Equation Balancer Play a Game
Related Images
1104
5
06/13/11

759
0
08/01/11

821
0
01/13/13