(4) slate because it is the strongest
Answer:
<h2><u><em>100 kcal of bond energy</em></u></h2>
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Any buffer exists in this equilibrium
HA <=>

In a buffer, there is a large reservoir of both the undissociated acid (HA) and its conjugate base (

)
When a strong acid is added, it reacts with the large reservoir of the conjugate base (

) forming a salt and water. Since this large reservoir of the conjugate base is used, the ph does not alter drastically, but instead resist the pH change.
At the end of the reaction, the catalyst is UNCHANGED.
:)
Answer:
Las Vegas is expected to recieve less precipitation