What adjective means "can eat through material"
corrosive
Name a pH indicator other than litmus or Universal Indicator.
methyl orange or phenolphthalein (also hydrangea flowers, turmeric, and anthocyanins)
How can we use litmus paper to test the pH of gases?
The litmus paper must be damp.
Acids turn litmus paper _____.
red
Alkalis turn litmus paper ______.
blue
A substance turns the Universal Indicator bright red. What does this "indicate"?
It is very acidic.
Universal Indicator is green in the presence of a substance. What does this indicate?
The substance is neutral.
What is the most accurate method to measure pH?
Use a pH meter which uses an electrode to measure pH electrically.
Acids have a pH of _____ than __.
less than 7
The more acidic the solution, the ______ the pH.
lower
Alkalis have a pH _________ than __.
greater than 7
Which acid is present in orange juice?
citric acid
A substance contains an excess of H+ ions. What is its pH?
It is acidic, so it is lower than 7.
A substance contains an excess of OH- ions. What is its pH?
It is alkaline, so it is higher than 7.
What acid is present in vinegar?
acetic acid (ethanoic acid)
What does "pH" actually stand for, anyway?!?!
The German "potenz H(ydrogen)", which means the power of the hydrogen-ion concentration.
