Aim:

To calculate the concentration of acid within a sulphuric chemical p solution.

Intro:

A titration is a method of analysis that will enable you to decide the precise endpoint of a response and the correct quantity of reactant in the titration flask. A burette can be used to deliver the second reactant towards the flask and an sign is used to detect the endpoint from the reaction. Therefore a reaction is set up among a regarded volume of a simple solution of not known concentration and a regarded volume of an answer with a noted concentration

Technique:

You should have:

* Answer of ‘acid rain' (dilute sulphuric acid)

* Salt hydroxide answer, 0. 1mol dm-3

5. 250cm3 conical flask

* 10cm3 pipette and filler

* Burette

* Phenolphthalein indicator.

2. Clamp

5. Funnel

2. White tile (to help reading endpoint)

Firstly prepare your burette, the burette ought to be filled with 0. 1mol dom-3 of the sodium hydroxide solution. When filling a flacon, close the stopcock at the end and use a funnel. Look for air bubbles and leaks, before carrying on. To remove any air bubbles tap the side of the burette while the remedy is going slowly. It is because if an air flow bubble exists during a titration the volume blood pressure measurements may be incorrect.

Take a volume reading and record the volume of answer in a desk (see fig 1). See the bottom with the meniscus. You need to make sure your attention is at the degree of meniscus, not really above or perhaps below since reading via an position, rather than right on will result in a parallax error.

Use a pipette to transfer 10cm3 with the ‘acid rain' sample into a 250cm3 conical flask. Add 5 drops of Phenolphthalein indicator. Make use of the burette to deliver small amounts of the solution to the titration flask by turning the stopcock. The indication will change coloring when the needed amount to get neutralisation mixes with the solution in the flask, it will become a permanent light pink coloring. This is the endpoint and should become approached...