When titrating a strong acid with a strong base, which is true?

1. the titration curve slopes upward
2. an indicator that changes at pH 8 would be acceptable
3. the pH changes slowly at the equivalence point

For any titration you want a sharp change in pH at the equivalence point; therefore, you KNOW #3 can't be right.

I'm not sure what #1 means but I would assume sloping upward would mean a more or less gradual change from beginning to end; therefore, I wouldn't pick #1.
The equivalence point for the titration of a strong acid with a strong base is at pH = 7.0. Most indicators are good over a range of pH = 2 so an indicator changing at pH = 8.0 should be ok.

So, in one of those titration curves, when it looks like it is stretched out with one side sloping down and the other up, is that representing titration with a weak acid or base?

Here is a typical titration curve. Scroll down about half way on the page.

http://www.sparknotes.com/chemistry/acidsbases/titrations/section1.html

To answer this question, we need to understand the concept of titration and the properties of strong acids and bases.

Titration is a technique used in chemistry to determine the concentration of a solution (in this case, an acid) by reacting it with a known concentration of another solution (in this case, a base) until the reaction is complete. The equivalence point is reached when the moles of acid and moles of base are in stoichiometric proportion, resulting in neutralization.

When titrating a strong acid with a strong base, the following statements are true:

1. The titration curve slopes upward: The pH of the combined solution increases gradually as the base is added to the acid because strong bases are capable of neutralizing strong acids. Initially, the pH is low due to the presence of a high concentration of hydronium ions (H3O+), but it increases as more hydroxide ions (OH-) are added.

2. An indicator that changes at pH 8 would be acceptable: Strong acids and strong bases can cause a significant pH change during titration. In this case, an indicator that changes at pH 8 would be suitable because it falls within the range where the pH increases. However, the specific choice of indicator depends on the desired accuracy and the pH range where the acid and base reaction occurs.

3. The pH changes slowly at the equivalence point: At the equivalence point, the reaction is complete, and all the acid and base have reacted. In the case of a strong acid-strong base titration, the pH does not change rapidly at the equivalence point. Instead, it levels off or changes gradually because the solution contains a salt that is nearly neutral and a small excess of hydroxide ions from the base.

Therefore, out of the given statements, the correct one is:

1. The titration curve slopes upward.