A 25.0-mL sample of 0.150 M hydrochloric acid is titrated with a 0.150 M NaOH solution. The pH at the equivalence point is .

7 (neutral).

Explanation:

Hello,

In this case, for the chemical reaction:

We can notice that since hydrochloric acid and sodium hydroxide are strong, they will fully dissociate during the titration, therefore, as they are in stoichiometric proportions in equal concentrations for the equivalence point, the pH will be 7 (neutral) since all the chloride ions are neutralized by the sodium ions.

Moreover, for the given acid solution, the required volume of sodium hydroxide will be:

To attain a complete titration until the equivalence point.

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answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e