Acid and alkalis Flashcards
(24 cards)
what is a PH scale?
It describes if a substance is an acid or alkali.
what happens when metals reacts with acid?
It forms hydrogen gas
what happens when equal amounts acid and alkali are mixed together?
a neutral solution is formed
what happens when acids react with carbonates?
salt water and carbon dioxide
what number is neutral
7
what colour is 1 on the ph scale
red
what colour is 10 on the ph scale
blue
what substance is classed as alkalis?
bleach or detergent
what substance is classed as acid?
lemon juice or battery acid
what warning label is a cross in the lab?
irritant or harmful
what warning label has a hand and a block being melted?
corrosive
how can you find out the ph number?
using a universal indicator or a ph meter
when can ph be important?
gardening or agriculture
how can chemicals affect the environment?
pollution
what is litmus?
an indicator that turns red in to acids and blue into alkalis
what is sulphuric acid?
a manufactured chemical used in paint and dye
what does concentrated mean?
it is undiluted
what does diluted mean?
it is weaker than in its original form
what does corrosive mean?
it can attack your skin and be harmful
give an example for corrosive
oven cleaner
give an example of a weak alkali
soap or toothpaste
how can you cancel out alkali?
by adding acid
what is it called when you cancel out alkali?
neutralisation
when is neutralisation important? give an example
controls indigestion in stomach, dealing with stings and bites, in gardening to get soil ph right.
