Are acids and alkalis always dangerous? L/O – To know the hazards of using acids and alkalis

Who do you agree with? “Acids are always dangerous, especially in your eyes. Alkalis are less hazardous” “Strong acids are more dangerous than strong alkalis. “ “Acids are not dangerous because you can drink them e.g. coke and lemon juice “Some acids have a low pH and are not so hazardous. Eye protection is needed when you deal with acids with higher pH”

What safety precautions should you take when using acids and alkalis? Use the lowest concentration possible Use small amounts Wear eye protection Wash your hands if you get acid on them Carry the bottle from the bottom not the neck Read the CLEAPPS safety sheets

Dangers Hazard symbols show us why the chemical is dangerous… Before we carry out any experiment, we must complete a risk assessment – we need to think about what risks there are, and what we should do if the risk occurs…

Key Stage 3 Risk Assessment HazardRiskMinimising Action Emergency Action Extra Info Use of Lab

Key Stage 3 Risk Assessment HazardRiskMinimising Action Emergency ActionExtra Info Use of Lab Tripping over stools/bags Stools under desk Bags under desk Ice on knocks Call first aider Hydrochloric Acid Lowest concentration and amount Eye protection Run under cold water If irritation – seek first aid If in eye flood with water for 10 mins Sulfuric AcidLowest concentration and amount Eye protection Run under cold water If irritation – seek first aid If in eye flood with water for 10 mins GlassCutsTake Care with glass Teacher clear up Elevate cut Pressure Call first aider

You are going to be given a selection of substances. It is your task to identify which is which. Substance A B C D E F