Basic Reversible
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Basic Reversible
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which direction does this reaction shift?
In the reversible reaction CH3COOH +H2O --> H30 +CH3COO, all aqeuous. With the indicator methyl orange which turns yellow in basic solutions (pH>4.4), and red in acidic solutions (pH<3.2), the reaction at equilibrium was a peach color. When I added 5 drops of NaCH3COO, the solution turned bright yellow. which direction did the shift occur?
First you must understand the difference between and acid and a base. An acid is a molecule/compound that is capable of donating a proton (i.e. H+) to a base. That would logically make a base a molecule that is capable of accepting a proton from a base.
Look on both sides of a balanced equation like the one you've written above. In one side, you have CH3COOH and on the other side you have CH3COO- which is called the conjugate base. Notice the very small difference? If you said an H is missing then you're right! Now, the one on the left had an H but doesn't on the right side. That means it gave away, or donated, its proton. Remember above we said that acids donate a proton? Well you've found the acid! The acid is the CH3COOH.
Now, who got the H that CH3COOH gave away? Well it didn't just disappear. On the left of the reaction you have an H2O but on the right you have an H3O which is called the conjugate acid. So the CH3COOH on the left gave its proton to the H2O that was on the left and then you wrote your products.
Okay now keep in mind there are exceptions to this but we won't talk about that right now. So now that we know what an acid and base are and how to recognize them, lets answer your question.
Logically speaking, since the color got "yellower" and we know that a yellow color indicates a basic solution, we can deduce that the solution got more basic so a base was added.
When you have a reaction thats at equilibrium, if you add more products (stuff on right) the reaction will shift to the left (towards the products). If you add more reactants (stuff on left) the reaction will shift to the right.
You added something that was on the products (right) side of your reaction. So what does that mean?
Your reaction shifted to the left (towards the reactants side).
I hope this wasn't information overload to you. Hope i could help. Good luck!
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