Acids And Bases
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What is an acid?
A type of chemical that devolves in water?
What is used to measure the acidity of a substance?
The PH scale
What is a base?
A base is a chemical that can neutralize an acid
At what pH is a substance neutral?
7
At what pH is a substance a weak acid?
5/6
What does alkalis mean?
It is a base that is soluble in water
What are the properties of a base?
They taste bitter They feel slippery on the skin Bases that are alkalis will dissolve in water Many bases are dangerous to taste or feel
What is a neutral substance?
A neutral substance is neither a base more an acid
What are the properties of an acid?
They are soluble In water They taste sour Acids feel rough on the skin Many acids are dangerous to touch or feel
What are the properties of a neutral substance?
There are no specific properties
Where on the pH scale is strong bases?
13/14
Where on the pH scale are weak bases.
8/9
How can we test for an unknown substance.
Using a acid-base indicator
What are some acid-base indicators?
Red cabbage water Universal indicator Bromothymol blue Phenolphthalein Litmus paper
What are the different tastes the human tongue can sense?
Salty Sweet Sour Bitter
What does the pH of a solution refer to?
How acidic or alkaline/basic a solution is
What are some examples of acids?
Fruit juice Vinegar Swimming pool acid Tartaric acid
What are some examples of bases?
Bicarbonate of soda washing powder soaps And other household cleaners
What are acid-base indicators used to test?
Whether a substance is acidic or basic
What does red litmus paper do when put into an acid?
It stays red
What does red litmus paper do when put in a base?
It turns blue
What does blue litmus paper do when put into an acid?
It turns red
What does blue litmus paper do when put into a base?
It stays blue
Does litmus paper identify a neutral substance? Explain
No. Litmus paper can only identify a base or an acid, therefore, more tests should be conducted