Net Ionic Equations for Common Chemical Reactions: Examples and Solutions

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Discussion Overview

The discussion revolves around writing net ionic equations for various chemical reactions, including reactions involving potassium amine, sulfur dioxide, nickel nitrate, and phosphorous trihydride. Participants also explore the behavior of aluminum in water and the characteristics of titration curves for weak acids. The scope includes theoretical understanding and practical application in chemistry.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant proposes the net ionic equation for potassium amine in water as K+ + NH3 + OH-, but expresses uncertainty about whether NH4+ should be included instead of NH3.
  • Another participant agrees with the net ionic equation for sulfur dioxide in water as H2SO3, indicating it is correct.
  • There is a claim that the net ionic equation for nickel nitrate and sodium sulfide is Ni2+ + S2- --> Ni2S, with a note that Ni2S is a solid that does not dissolve in water.
  • For the reaction of phosphorous trihydride with boron trichloride, one participant suggests it forms a solid compound PH3BCl3, while another is uncertain about whether it is a double replacement or forms a single molecule.
  • Participants discuss the reaction of aluminum with water, with one suggesting it could produce either [Al(H2O)6]3+ or Al(OH)3 + H2, while another notes that aluminum is passivated by Al2O3 and does not react with distilled water.
  • There is a discussion about the titration curve of a weak monoprotic acid, with one participant indicating that both a rapid increase followed by a sharp increase and a gradual increase followed by a sharp increase could be correct, depending on interpretation.

Areas of Agreement / Disagreement

Participants generally agree on some net ionic equations, particularly for potassium amine and sulfur dioxide. However, there are multiple competing views regarding the reactions of aluminum and phosphorous trihydride, and the discussion remains unresolved on certain points, particularly concerning the titration curve interpretations.

Contextual Notes

Participants express uncertainty about specific reactions and the conditions under which they occur, such as the behavior of aluminum in water and the nature of the titration curve for weak acids. There are also unresolved aspects regarding the formation of products in certain reactions.

ksinclair13
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Alright, these were asked on the test I took today, and I was just seeing if I did them correctly.

Write the net ionic equations for the following reactions (don't need to be balanced):

1. Solid potassium amine is added to distilled water.

KNH2 + H2O ---> K+ + NH3 + OH-

2. Sulfur dioxide gas is bubbled through distilled water.

SO2 + H2O ---> H2SO3

3. Nickel nitrate is mixed with sodium sulfide.

Ni+ + S2- ---> Ni2S

4. Phosphorous trihydride is combined with boron tricloride.

PH3 + BCl3 ---> BH3 + PCl3

For the first one, I'm thinking it might be NH4+ on the products side instead of NH3...? I'm not that confident about the second one, and I think I nailed the third one, but maybe not. For the last one, I didn't know if it would be a double replacemnet or if it would form one big molecule...If anyone notices any mistakes, big or small, please point them out =). This is my worst part of chemistry :-(
 
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Ni2+.Borek
 
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Oh okay, thank you. So everything else is surprisingly correct then? Or were you just pointing out that one mistake?

Aluminum metal is washed with excess distilled water.

Al + H2O ---> [Al(H2O)6]3+

or would it simply be:

Al + H2O ---> Al(OH)3 + H2

An unknown weak monoprotic acid is titrated using a standard strong base. The titration curve will be as follows:

A. Rapid increase and then no sharp increase
B. Gradual increase and then a sharp increase
C. ...
D. ...
E. ...

The wording is kind of messed up here. Both are sort of correct. There will be a small rapid increase initially, but then there is a sharp increase (not AS sharp as a strong acid-strong base titration, but still sharp) when it nears the equivalence point.

You could also argue that it gradually increases and then there is that sharp increase that I was talking about. However, that sounds more like a strong acid-strong base. Therefore, I guessed A, knowing that either could technically work.

Any more help is greatly appreciated!
 
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1st probably OK, 2nd OK for sure, no idea about 4th.

Al doesn't react with distilled water, it is passivated with Al2O3.

Your thinking about AB wording sounds correct, it can be argued they are both OK or both wrong.Borek
 
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Thank you again! My teacher makes his tests exactly like the AP Test, except half as long. They are very difficult, which means he makes a big curve, so I always get an A :).
 
Reply

Hi.
1. Correct!

2. Correct!

3. Ni2+ + S2- --> NiS(s)
NiS is solid black substance. It doesn't dissolve in water.

4. PH3 + BCl3 --> PH3BCl3
PH3BCl3 is solid, PH3 and BCl3 are gasses.
 

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