Indicators and pH Flashcards
1
Q
What is an indicator?
A
A chemical substance that changes colour in an acid or an alkali.
2
Q
What is a substance that has a pH below 7 ?
A
battery acid
lemon juice
vinegar
3
Q
What is a substance that has a pH of 7 ?
A
water
4
Q
What is a substance that has a pH over 7 ?
A
laundry detergent
drain cleaner
baking soda
5
Q
What is the advantage of determining the pH than just finding out if if the substance is an acid or an alkali?
A
you can know how concentrated or diluted the acid or alkali
6
Q
What are the steps to making an indicator using red cabbage?
A
- you cut up red cabbage and push out the juice while grounding it
- add warm water
- filter
- now you have an indicator that’s ready to use
