Titration

Question 1

What is the purpose of this practical?

Answer 1

To find the concentration of an acid. If we know the volume of an acid needed to neutralise an alkali with a known volume and concentration then we can find the concentration.

Question 2

What does the reaction between Sulfuric Acid and Sodium Hydroxide produce?

Answer 2

Sodium Sulfate and Water
Salt and Water

Question 3

What is the method for carrying out the titration practical?

Include terms such as: Pipette, Conical flask, Burette, Phenolphtalein indicator, Sulfuric acid

Answer 3

1. Use pipette to measure 25cm^3 of sodium hyrodixde solution and transfer itno conical flask.
2. Place conical flask onto white tile and place under burette.
3. Use funnel to fill burette with sulfuric acid and record initial volume of acid (make sure eye is level with meniscus)
4. Add 5 drops of Phenolphthalein indicator to conical flask
5. Slowly open burette tap and swirl conical flask.
6. Once colour starts to change slightly add sulfuric acid drop by drop.
7. Stop adding when colour of solution changes from pink to colourless (neutralisation has occured)
8. Record volume of acid still in burette and calculate volume of acid used to neutralise sodium hydroxide.
9. Repeat experiment until you have concordant results (within 0.1cm^3 of one another)
10. Calculate mean volume of sulfuric acid (Titre) needed and using moles calculate concentration.