Question

Given (Titration 1)

Titrant: NaOH

Analyte:HCl

pH 1/2 way point: 1.56

Volume at HALF-WAY point :8.75,

pH at EQUIVALENCE POINT: 6.79

Volume at EQUIVALENCE POINT: 7.50

Given (Titration 2)

Titrant: NaOH

Analyte: HC2H3O2

pH 1/2 way point: 5.47

Volume at HALF-WAY point: 4.50

pH at EQUIVALENCE POINT: 10.50

Volume at EQUIVALENCE POINT: 6.75

Given (Titration 3)

Titrant: HCl

Analyte: NH3

pH 1/2 way point: 4.47

Volume at HALF-WAY point: 2.50

pH at EQUIVALENCE POINT: 9.51

Volume at EQUIVALENCE POINT: 4.20

Explain your answer clearly please

1. Of the three titration curves, which has the longest vertical jump to indicate the equivalence point?
2. What relationships exist at a half-way point for acids? For bases?
3. What relationship exists at the equivalence point?

Answer 1

1)Titration 2

2)

The half equivalence point represents the point at which exactly half of the acid in the buffer solution has reacted with the titrant. The half equivalence point is relatively easy to determine because at the half equivalence point, the pKa of the acid is equal to the pH of the solution.

3)

Equivalence point: point in titration at which the amount of titrant added is just enough to completely neutralize the analyte solution. At the equivalence point in an acid-base titration, moles of base = moles of acid and the solution only contains salt and water.