Q6.

(a) Plot your data for the titration of hydrochloric acid with sodium hydroxide performed in this section directly

on Figure 1. Draw a smooth curve through the points.

(b) On your experimental titration curve, label:

●

>

The beginning of the titration (before any NaOH has been added) as point A.

The equivalence point as point B.

O

NOTE: The equivalence point is not easy to locate on experimental curves. One way is to draw a

vertical line at the 5-drop point. You can see that the difficulty arises because of the very large

pH rise (i.e., approximately 8 pH units, a change in [H*] of 100,000,000!) that occurs close to the

equivalence point..

A point well past the equivalence point as point C.

(c) Label the pH at each point, A-C.

(d) Label the dominant species in solution at each point, A-C.

Hint: use the molecular equation you wrote in Q5.

(e) Mark the pH transition range of each indicator from Section C using either a bracket or a box.

molor

HI(29); NaOH(94)-1 Nal(99) + H₂O) =

H²(aq) + OH (99₂) -> H₂0 (1)

(wetionic).