PLEASE ANSWER ASAP WILL MARK BRAINLIESTTT Describe how the pH and hydronium ion concentration will change in a solution as an acid is added to it.

as acid is added, the pH of a solution decreases and the hydronium acid concentration increases.

Explanation:

the pH & hydronium ion concentration of solution are inversely related by the equation pH=-log(H+).

Acids are hydronium donors, so when we add an acid to a solution, the hydronium in it will decrease.

Using the above equation, we can see that the more hydronium is added, the less the pH will be since there's a negative sign.

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a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.