Titration of Acid and Bases

METHODOLOGY
For this experiment, the following materials will be needed: 250mL beaker, one (1) 10mL graduated cylinder, one (1) 25mL graduated cylinder, three (3) 250mL erlenmeyer flask, 20mL of clear liquid bath soap, 50mL of 1.0M HCl (hydrochloric acid), 100mL distilled water, one (1) iron clamp, one (1) iron stand, one (1) funnel, acid and base buret, and phenophthalein indicator.

Assemble the titration set-up by clamping the acid and base buret in each of the sides of the buret clamp. There must be a enough space between the tip each of the burets and the base of the buret stand so that an erlenmeyer flask may be able to fit, as shown in Figure 1. Also make sure that the clamp is tight to prevent the burets from falling from the set-up.

Figure 1. Titration set-up

Titration of Base
Prepare the analyte by measuring 5.0mL of liquid bath soap in a beaker then dissolving this with distilled water to create a 50.0mL solution. Using a graduated cylinder, measure 20.0mL of the analyte and transfer this to a 250mL erlenmeyer flask. Add two drops of phenophthalein indicator, then gently swirl.

For the titrant, simply pour your desired amount of hydrochloric acid (HCl) into the base buret. Record the initial buret reading. Move your eyes to the level of the liquid surface and read the value of the bottom of the meniscus as shown in Figure 2.

Figure 2. Reading the volume using the bottom meniscus

Slowly add the titrant from the buret using the stopcock and swirl the erlenmeyer flask while doing so to and mix the solution. Stop once the solution becomes colorless. Record the final buret reading. Repeat for trials 2 and 3 using different volumes for the titrant.

Titration of Acid
Prepare the analyte by measuring 5.0mL of liquid bath soap in a beaker then dissolving this with distilled water to create a 50.0mL solution. Using a graduated cylinder, measure 20.0mL of the analyte and transfer this to a 250mL erlenmeyer flask. Add two drops of phenophthalein indicator, then gently swirl.