Acid or alkali Look at the five substances

Acid or alkali? Look at the five substances which follow. For each one, decide whether it is an acid or an alkali. Science Progress © Hodder & Stoughton 2014

Lemon juice Acid Science Progress © Hodder & Stoughton 2014 Alkali

Sodium hydroxide Acid Sodium hydroxide Science Progress © Hodder & Stoughton 2014 Alkali

Vinegar Acid Science Progress © Hodder & Stoughton 2014 Alkali

Ammonia Acid Science Progress © Hodder & Stoughton 2014 Alkali

Soap Acid Science Progress © Hodder & Stoughton 2014 Alkali

EVERYDAY ACIDS AND ALKALIS

LO: Name some acidic and alkaline substances. What is acid? What is alkali? Working with a partner: � Divide � Label � You your paper in half one half ACID and one half ALKALI have 5 minutes to write down all the words you can think of to describe and give examples

LO: Name some acidic and alkaline substances. What is acid? What is alkali? Time’s Up!

LO: Describe how litmus can be used to identify if a solution is acidic or alkaline. Testing � Substances can be acidic, alkaline or neutral � Substances can be tested using litmus paper. It changes colour in the presence of an acid or alkali.

Testing � Universal indicator liquid changes colour in the presence of an acid or alkali.

LO: Describe how litmus can be used to identify if a solution is acidic or alkaline. Testing Substances Practical � Copy the table below to record your results � Test each substance with litmus paper � Test each substance with universal indicator Substance Litmus Paper Universal Indicator (Acid, Alkali, Neutral)

Complete the universal indicator worksheet