Starter Mini-Whiteboard Quiz

Neutralisation Titration May 7 th, 2010

All: Perform a practical safely and efficiently to collect sufficient measurements and observations Most: Identify variables and analyse results Name the salt formed in a neutralisation reaction Independently recognise risks involved in a practical investigation Some: Understand what is meant by the end-point of neutralisation Know when repeat readings are necessary

Titration Watch the short video clip about titration.video clip In your exercise books, jot down any safety points outlined in the video clip.

Practical Method Interactive Demonstration On the next slide are the instructions for today’s titration BUT they are in the wrong order Working with your lab bench place them in the correct order

Gather all equipment for the practical Place the burette in the clamp on the retort stand and using a funnel fill it with hydrochloric acid to the 0.00 cm 3 mark (make sure the stopcock is closed) Measure out 10 cm 3 of sodium hydroxide with a measuring cylinder and transfer to a conical flask (placed on a white tile under the burette) Add 2 or 3 drops of phenolphthalein indicator to the conical flask and swirl Await further instruction from your teacher

Overshoot Trial Run Titration 1 Initial Volume of Acid (cm 3 ) Final Volume of Acid (cm 3 ) Total Volume of Acid Added (cm 3 )

Answer the ‘Post- Practical Questions’ in your exercise books

Plenary Mini-Whiteboard Quiz

An acid…. Acancels out an alkali Bcancels out water Cis a salt Dhas a pH of 7

A substance with a pH of 4 is said to be….. A Acid B Alkali C Strongly alkaline D Neutral

A neutral substance has a pH of…. A4A4 B7B7 C9C9 D14

Which substance cancels out an alkali? AAcid BAlkali CWater DSalt

A reaction where an acid cancels out an alkali is said to be a…. ADecomposition reaction BPrecipitation reaction CNeutralisation reaction D Oxidation reaction

What is produced when an acid reacts with an alkali? ASalt and Water B Salt and acid CAcid and alkali DWater and acid

What is produced when sodium hydroxide reacts with hydrochloric acid ? ASodium Chloride BSodium chloride and water CSodium sulphate DSodium hydroxide and water

How could you measure the volume of a liquid accurately? Apipette Bbeaker Cmeasuring cylinder Dconical flask

The end-point of neutralisation is when.... Athe pH is neutral Bmore acid than alkali is found in the conical flask Cthe indicator has a permanent colour change DMr. Knights says so

We repeat experiments so we can... Aobtain valid results Bhave a fair test Cobtain reliable and concordant results and check for anomalies Dbe accurate and precise

All: Perform a practical safely and efficiently to collect sufficient measurements and observations Most: Identify variables and analyse results Name the salt formed in a neutralisation reaction Independently recognise risks involved in a practical investigation Some: Understand what is meant by the end-point of neutralisation Know when repeat readings are necessary