Starter – think about these questions, you can jot ideas in the back of your book! • What is an acid? • What is an alkali? • What is the difference between an base and an alkali? • What does neutral mean? • What is neutralisation?
Objectives • To understand and be able to use key science words (acid, alkali, neutral, base and neutralisation). • To know the general equation for neutralisation and be able to use this to generate specific equations. • To be able to add details onto a data logged graph of neutralisation.
Neutralisation • Measure 20cm3 of hydrochloric acid into a beaker. • Add a few drops of UI soln. • Using a pipette, add sodium hydroxide to the acid. • Observe.
Log onto the computer. Take a temperature probe and put it into the USB drive. Take the pH probe and put it into the USB drive. Start, programmes, Vernier Software, LoggerPro 3.4.2. Set up the data logger
Neutralisation • Measure 30ml of HCl into a beaker. • Add a little squirt of UI soln. • Put the probe into the ice. • Start collecting the data. • Add NaOH slowly until you have added 35ml. • Stop collecting the data and autoscale. • Print your graph.
Mark in red pen where the graph is acid. Mark in blue pen where the graph is basic. Make in green pen where neutralisation happens. Contrast the temperature and the pH graph – what do they show you? Neutralisation pH Time
Which is true? • All alkalis have a pH <7 • All alkalis have a pH >7 • All alkalis have a pH =7
What is made is made when an acid and alkali react? • Water • Salt and water • Carbon dioxide, salt and water
Which one of the following do alkalis and bases not have in common? • They are the opposites to acids • They have a pH greater than 7 • They dissolve in water
Which is the formula for phosphoric acid? • H3PO4 • H3PO4 • HPO4
What is the name of the salt produced when sodium hydroxide reacts with nitric acid? • Table salt • Sodium chloride • Sodium nitrate
What type of medicine is a cure for indigestion? • Antacid • Strong alkali • Milk • Neutral