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In this classic lab experiment, we are performing an acid-base titration. A titration is a lab technique often used to determine the concentration of a solution, using another solution of known concentration. In an acid-base titration, one of the reactants, in this case the acid HCl, is placed in a flask and titrated with the base NaOH, which is added to a buret. A buret is a device used for the addition of a solution and measuring its volume. This is outlined in the video link that goes along with this lab. In an acid-base titration, the two reactants are mixed until they have completely neutralized each other. In order to know when we have reached the point of neutralization, we need something present in the reaction to show us that the neutralization has occurred. That is why an indicator is added to the acid in the flask. An indicator in this case would look one way in an acidic solution and look another way in basic solution. Phenolphthalein is added to the acid in the flask before starting the titration. Phenolphthalein is clear in acidic solution and turns pink when it is in a basic solution. The point when the indicator changes color is called the endpoint. Once the acid is neutralized, the next tiny amount of NaOH that is added will turn the solution basic and thus the phenolphthalein will turn pink, indicating that the titration is complete. HCl (ag) + NaOH (ag) -> NaCl (ag) + H2O (ag) Report Sheet Molarity of HCl: 0.1016 M Trial 1 2 3 Volume of HCl (mL) 25.00 25.00 25.00 Final buret reading, mL 0.00 21.60 0.00 Initial buret reading, mL 21.60 44.30 20.20 Volume of NaOH (titrant) Molarity of NaOH solution, mol L-1 Average molarity of NaOH solution, mol L-1

In this classic lab experiment, we are performing an acid-base titration. A titration is a lab technique often used to determine the concentration of a solution, using another solution of known concentration. In an acid-base titration, one of the reactants, in this case the acid HCl, is placed in a flask and titrated with the base NaOH, which is added to a buret. A buret is a device used for the addition of a solution and measuring its volume. This is outlined in the video link that goes along with this lab. In an acid-base titration, the two reactants are mixed until they have completely neutralized each other. In order to know when we have reached the point of neutralization, we need something present in the reaction to show us that the neutralization has occurred. That is why an indicator is added to the acid in the flask. An indicator in this case would look one way in an acidic solution and look another way in basic solution. Phenolphthalein is added to the acid in the flask before starting the titration. Phenolphthalein is clear in acidic solution and turns pink when it is in a basic solution. The point when the indicator changes color is called the endpoint. Once the acid is neutralized, the next tiny amount of NaOH that is added will turn the solution basic and thus the phenolphthalein will turn pink, indicating that the titration is complete.
HCl (ag) + NaOH (ag) -> NaCl (ag) + H2O (ag)
Report Sheet
Molarity of HCl: 0.1016 M
Trial 1 2 3
Volume of HCl (mL) 25.00 25.00 25.00
Final buret reading, mL 0.00 21.60 0.00
Initial buret reading, mL 21.60 44.30 20.20
Volume of NaOH (titrant)
Molarity of NaOH solution, mol L-1
Average molarity of NaOH solution, mol L-1

Added by Alexander A.

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