SC8 Acids and Alkalis

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

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Front (Question)

What is a ph scale?

Back (Answer)

A scale used to determine how acidic or alkaline a solution is

Front (Question)

What number on the pH scale are considered acidic?

Back (Answer)

Front (Question)

What number on the pH scale are considered alkaline?

Back (Answer)

> 7

Front (Question)

What number on the pH scale are considered neutral?

Back (Answer)

Front (Question)

How can we find out the pH of a substance?

Back (Answer)

Using an indicator

Front (Question)

Name a few common indicators

Back (Answer)

• litmus • methyl orange • phenolphthalein

Front (Question)

What colour is litmus in acidic solutions?

Back (Answer)

Red

Front (Question)

What colour is litmus in alkaline solutions?

Back (Answer)

Blue

Front (Question)

What colour is methyl orange in acidic solutions?

Back (Answer)

Red

#10

Front (Question)

What colour is methyl orange in alkaline solutions?

Back (Answer)

Yellow

#11

Front (Question)

What colour is phenolphthalein in acidic solutions?

Back (Answer)

colourless

#12

Front (Question)

What colour is phenolphthalein in alkaline solutions?

Back (Answer)

Pink

#13

Front (Question)

What happens when acids dissolve in water?

Back (Answer)

They produce an excess of hydrogen ions

#14

Front (Question)

How does the concentration change in acidic solutions?

Back (Answer)

The higher the number of hydrogen ions in a certain volume, the higher the concentration. A higher concentration ensures a lower pH

#15

Front (Question)

What makes a solution acidic?

Back (Answer)

It contains hydrogen ions

#16

Front (Question)

What makes a solution alkaline?

Back (Answer)

The presence of hydroxide ions

#17

Front (Question)

How does concentration change in alkaline solutions?

Back (Answer)

The more the concentration of hydroxide ions increases the pH of an alkaline solution

#18

Front (Question)

What is the difference between a dilute and a concentrated solution?

Back (Answer)

• a dilute solution only contains a small amount of a dissolved solute • a concentrated solution contains a large amount of a dissolved solute

#19

Front (Question)

How is concentration calculated?

Back (Answer)

amount dissolved/volume of solution

#20

Front (Question)

How is the concentration of hydrogen ions linked to the pH of an acid?

Back (Answer)

If the concentration of hydrogen ions is increased by a factor of 10, the pH decreases by 1

#21

Front (Question)

What is a strong acid?

Back (Answer)

An acid wherein ions completely dissociate into the solution

#22

Front (Question)

What is a weak acid?

Back (Answer)

An acid wherein ions only partially dissociate into the solution

#23

Front (Question)

What are bases?

Back (Answer)

Substances that neutralise acids to form a salt and water only

#24

Front (Question)

Write the word equation for when a metal oxide reacts with an acid

Back (Answer)

metal oxide + acid —> salt + water