C3.3.2 - The pH scale Flashcards

1
Q

What is an acid?

A

A substance that ionises in water, releasing hydrogen ions

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2
Q

What is a base?

A

A substance that neutralises acids forming a salt and water only

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3
Q

What is an alkali?

A

A soluble base

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4
Q

What is pH?

A

The relative acidity of alkalinity of an aqueous solution

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5
Q

What is the pH scale?

A

A scale that measures relative acidity or alkalinity of an aqueous solution

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6
Q

What does pH<7 mean?

A

It is acidic

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7
Q

What does pH = 7 mean?

A

It is neutral

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8
Q

What does pH > 7 mean?

A

It is alkaline

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