Question

question 3
what shape do titration curves typically have?
circular
zigzag
s - shaped
u - shaped
question 4
what is the equivalence point in a titration curve?
when the ph reaches 7
when the moles of base equal the moles of acid
when the ph starts to increase
when the titrant is completely added

Explanation:

• Question 3: Titration curves are typically S - shaped. This is because at the start (before the equivalence point), the pH changes slowly. Near the equivalence point (where the amount of titrant added is stoichiometrically equivalent to the amount of analyte), there is a rapid change in pH. After the equivalence point, the pH change slows down again.
• Question 4: The equivalence point in a titration curve is when the moles of base equal the moles of acid (in an acid - base titration). The pH at the equivalence point is not always 7 (it depends on the strength of the acid and base). The pH starts to increase (in an acid - base titration where base is the titrant) before the equivalence point. And the titrant is not completely added at the equivalence point; usually, more titrant can be added after the equivalence point.

Answer:

• Question 3: C. S - shaped
• Question 4: B. When the moles of base equal the moles of acid