Chem lab Neutralization Titration Lab

What is a titration?

measures the volume of solution delivered from a buret.

What occurs in this experiment?

sodium hydroxide is titrated into a flask containing an unknown vinegar solution.

What type of solution is vinegar?

an acetic acid solution.

When do you stop the titration?

After a sufficient amount of base is added to neutralize the acid in the flask

What is it called when titration stops?

endpoint

What and how did the endpoint signaled by?

an indicator that changes color.

What indicator used in this experiment?

phenolphthalein.

What color is Phenolphthalein in acid?

colorless

What color is phenolphthalein in base?

red-pink in base.

What should the acid solution containing the indicator be before a very slight excess of base is added?

colorless

What happens to the solution at the endpoint?

the phenolphthalein changes the color of the solution to light pink.

How much of the base is sufficient to bring about the color change?

A single drop of base

How is the sodium hydroxide used in this experiment was prepared?

by diluting a more concentrated solution.

Why it is necessary to standardize the solution?

Since dilution provides only an approximate concentration so it is necessary to determine the concentration of the sodium hydroxide solution precisely.

Where is the concentration recorded?

its recorded on the bottle, with the appropriate number of significant figures.