What is the purpose of acid-base titration lab?
An acid-base titration is an experimental procedure used to determined the unknown concentration of an acid or base by precisely neutralizing it with an acid or base of known concentration. This lets us quantitatively analyze the concentration of the unknown solution.
What is the aim of titration of sodium hydroxide with hydrochloric acid?
The goal of the titration is to get as close as possible to the equivalence point by careful addition of the base; this will ensure the calculated acid concentration is as close to the true value as possible. You will do three titrations and average the trials.
Why is phenolphthalein a good indicator?
A strong acid- strong base titration is performed using a phenolphthalein indicator. Phenolphtalein is chosen because it changes color in a pH range between 8.3 – 10. It will appear pink in basic solutions and clear in acidic solutions. Titration: Titration of an acid-base system using phenolphthalein as an indicator.
What is titration lab?
A titration is a lab technique used to determine the volume of a solution that is needed to react with a given amount of another substance. In this activity, your goal is to determine the molar concentration and strength of two acid solutions by conducting titrations with a base solution of known concentration.
How is titration done?
The process is usually carried out by gradually adding a standard solution (i.e., a solution of known concentration) of titrating reagent, or titrant, from a burette, essentially a long, graduated measuring tube with a stopcock and a delivery tube at its lower end. …
When should you stop a titration?
You should stop adding titrant when a pale color that persists throughout the solution for several seconds is observed. If the solution is intensely pink, you should either disregard the data or back-titrate the sample. IMAGE 2a.
How do you dilute NaOH for titration?
Stir the sodium hydroxide, a little at a time, into a large volume of water and then dilute the solution to make one liter. Add sodium hydroxide to water—do not add water to solid sodium hydroxide.