pH < 7
changes blue litmus to red
Sour taste
corrosive
100
What is the pH scale? Give a definition
A scale from 1 to 14 that helps classify acids and bases
100
What is an indicator? (Give a definition)
Something that helps you determine if a substance is an acid or a base
100
What happens when you put universal indicator in acids
turns to red
100
Is lemon juice acid or base?
acid
200
Give 3 properties of bases
tastes bitter
feels slippery/soapy
pH > 7
changes red litmus to blue
200
pH number of neutral substances
7
200
What happens when you put baking soda in acids? what happens when you put baking soda in bases?
acids: it bubbles
bases: nothing
200
You placed a drop of an unknown substance into litmus paper and the paper turned red. Was your substance acidic or basic?
acidic
200
Is oven cleaner an acid or base?
base
300
has a lot of the acid dissolved in a small volume of water
concentrated acid
300
What numbers do acids have in the pH scale? What numbers do bases have in the pH scale?
acids: 0-7
bases:7-14
300
What is the name of the paper we used in lab that helped us determine whether a substance is acidic or basic?
litmus paper
300
You used cabbage juice to identify if a substance was acidic or basic. After mixing it, the solution turned dark blue. Which of the following is most likely to be the unknown substance? baking soda, lemon juice or milk?
baking soda
300
Is laundry detergent acid or base?
base
400
Has a little bit of the acid dissolved in a large volume of water
dilute acid
400
What are strong acids?
substances that are very acidic. They are closer to 0
400
What happens when you put a drop of a base into litmus paper?
the litmus paper will turn blue
400
You used red cabbage juice to identify if a substance was acidic or basic. After mixing it, the solution turned yellow. Was your solution acidic or basic?
Basic
400
Is rain water an acid or a base?
acid
500
concentrated acids and bases can eat away at the skin and are, therefore...
corrosive
500
What are weak bases?
substances that are not very basic. They are closer to 7
500
name three indicators you might know.
litmus paper, red cabbage, universal indicator...
500
you used red cabbage juice to determine if a substance is acidic or basic. After mixing it, your solution turned green. What is your solution most likely to be? coffee, kiwi or salt?
salt
500
Coffee, milk, yoghurt, mayonnaise and pickles are all examples of bases. True or False?