I'm Drinking Acid?! Titration
Many of the beverages you commonly consume contain acids. In this lab you will measure the pH of some common beverages through titration.
When an acid reacts with a base, the hydrogen ion from the acid reacts with the hydrogen ion from the base in accordance with the following chemical equation: HA + NaOH → NaA + H2O
In this representation of an acid-base reaction, the acid (HA) reacts with the base, sodium hydroxide (NaOH), to produce a salt (NaA) and water. The products of an acid-base reaction are commonly salt and water.
The pH is a measure of the concentration of hydrogen ions in an acid or a base. The pH scale ranges from 0 to 14. Acidic pHs include values below 7, while bases have pH values above 7. Neutral substances have a pH within a close range to 7.
A titration is a process commonly used to determine the unknown concentration of a solution of an acid. In this lab, we will be titrating various acidic beverages that contain citric acid.
The equivalence point is the point at which enough titrant is added to neutralize the acid within the acidic beverage. The endpoint of a titration occurs when the used indicator (in this case, phenolphthalein) causes the solution to change color. The endpoint is a physical indicator of neutralization, but it is not always exactly the same as the equivalence point.
Find a PDF copy of the lab procedure and report below!
