What are acids?
All acids taste sour. An example is vomit.
Whta are Alkalis?
Alkalis are the chemical opposite of acids. Soap solution is an example of an alkali, and so is toothpaste. Most Alkalis feel soapy.
What does a hazard symbol show that the solution is?
The hazard symbol means the solution is corrosive.
What does corrosive mean?
Corrosive means the substance is very dangerous and could burn your skin and eyes.
How can you control risks from corrosive solutions?
By wearing eye protection and keeping the solution off your skin.
What is a difference between a concentrated acid and a dilute acid?
The concentrated acid will have have a lot more grams per litre than the dilute solution.
The hazards of using acids and Alkalis depend on?
The acid or alkali you are using
Whether the solution is concentrated or dilute
What is an indicator?
You can use an indicator to find out whether a solution is acidic or alkaline. An indicator contains a dye. The dye turns a different colour in acidic and alkaline solutions.
What colour does red litmus paper turn when adding an alkali?
It turns blue
What colour does blue litmus paper turn when adding an acid?
What is the pH scale?
The pH scale is a measure of how acidic or alkaline a solution is.
What does an acid have a pH of?
An acid has a pH of less than 7. The lower the pH the more acidic the solution
What does an alkaline have a pH of?
An alkaline has a pH of more than 7. The higher the pH the more acidic the solution is.
What is a neutral pH and what does it mean ?
The pH level is 7, it means it netheir acidic nor alkaline.