1. What is the difference between equivalence point and endpoint? 2. In a titrat

Question

1. What is the difference between equivalence point and endpoint?

2. In a titration with a strong acid and a strong base, why used phenolphthalein as the indicator?

3. If the color remains clear, then is the solution acidic or basic?

Data.

Trial Initial volume Final volume moles of base moles of acid concentration of acid

1 0.14mL 15.74mL

2 0.02mL 14.40mL

3 0.05mL 15.11mL

Average of the acid concentration:

Procedure.

A student added 20.00mL of acid to a Erlenmeyer flask along with 2-3 drops of indicator. Then using a 0.106 M base, the student titrated the solution. The color will change from clear to pink as you add the base. Once, you observe a faint pink color for 10 seconds, then you are complete. The data above is taken from 3 trials of titrations after adding the necessary base. (HCl - acid and NaOH -base) This neutralization is a 1:1 mole ratio.

Explanation / Answer

QUESTION 1

Equivalence ponit: It is the theoretical end point, where an equivalent amount of A is added to B. The titration is complete at this position.

End point: The physically observed point at which the reaction ends. The indicator colour change occurs at this point.

Titration error is the difference between the equivalence point and end point.

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