Acids, Bases And pH Value Flashcards
(26 cards)
Do acids have more or less Hydrogen?
More
What is pH?
The potency of Hydrogen in a substance
Do acids have more or less Hydrogen?
More
How can substances be classified?
Acids
Bases
Neutrals
What are the properties of acids?
They often taste sour
They can be corrosive
They have a pH of 6.9 or lower
What are the properties of bases?
They often taste bitter
Feel soapy
Have a pH of 7.1 or higher
What is the pH scale?
A scale of numbers that indicates the strength of acids and bases
What is the scale range of the pH scale?
0-14
What is the pH of a neutral substance?
7
What are indicators?
Special chemicals that help to determine the pH of a substance
How do indicators show pH?
They change colour
What indicators are there?
Litmus paper Red cabbage water Bromothymol blue Universal Indicator Phenolphthalein
What range of colours will Universal Indicator turn in an acid?
Red
Orange
Yellow
What range of colours will Universal Indicator turn in a base?
Purple
Blue
Turquoise
What are examples of acids?
Dairy products
Lemon juice
Vinegar
Tea
What are examples of bases?
Drain cleaner
Bicarbonate of soda
What is an example of a neutral substance?
Distilled water
With UI, what colour is the pH value 1-2?
Red
With UI, what colour is the pH value 3-4?
Orange
With UI, what colour is the pH value 5-6?
Yellow
With UI, what colour is the pH value 7?
Lime green
With UI, what colour is the pH value 8?
Green
With UI, what colour is the pH value 9?
Turquoise
With UI, what colour is the pH value 10?
Light blue
