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Acids And Alkalis

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卡片总数: 24 张•内容版本: v4•公开卡包•更新时间: 8/1/2026

卡片预览 (24 张)

#1
正面 (问题)

The pH scale

背面 (解答)

A scale ranging from about 0-14, telling you how acidic or alkaline a solution is.

#2
正面 (问题)

What pH is a strong acid?

背面 (解答)

1-3 (Red)

#3
正面 (问题)

What pH is a weak acid?

背面 (解答)

4-6 (orange, yellow and light green)

#4
正面 (问题)

What pH is neutral?

背面 (解答)

7 (Green)

#5
正面 (问题)

What pH is weak alkali?

背面 (解答)

8-10 (Green to blue)

#6
正面 (问题)

What pH is strong alkali?

背面 (解答)

11-14 (Dark blue to purple)

#7
正面 (问题)

Acids have a pH of less than…

背面 (解答)

6

#8
正面 (问题)

Examples of acids

背面 (解答)

Nitric acid, sulfuric acid, hydrochloric acid, carbolic acid, phosphoric acid (coca cola), citric acid (eg. lemons)

#9
正面 (问题)

Bases have a pH of more than…

背面 (解答)

8

#10
正面 (问题)

Examples of bases

背面 (解答)

Sodium hydroxide, copper oxide, potassium hydroxide, ammonia

#11
正面 (问题)

What is calcium hydroxide?

背面 (解答)

Limewater

#12
正面 (问题)

What is litmus paper?

背面 (解答)

It is filter paper soaked in litmus solution and dried, and it is best to test gases.

#13
正面 (问题)

Name all the indicators

背面 (解答)

• Red litmus solution • Blue litmus solution • Phenolphthalein solution • Methyl orange solution • Universal indicator solution

#14
正面 (问题)

Red litmus solution

背面 (解答)

Acid: Stays red Neutral: Stays red Alkali: Goes blue

#15
正面 (问题)

Blue litmus solution

背面 (解答)

Acid: Goes red Neutral: Stays blue Alkali: Stays blue

#16
正面 (问题)

Phenolphthalein solution

背面 (解答)

Acid: Stays colourless Neutral: Stays colourless Alkali: Goes bright pink

#17
正面 (问题)

Methyl Orange solution

背面 (解答)

Acid: Goes red Neutral: Stays orange Alkali: Goes yellow

#18
正面 (问题)

Universal indicator solution

背面 (解答)

Acid: Goes red/yellow/orange Neutral: Goes green Alkali: Goes blue/purple

#19
正面 (问题)

Testing with litmus solution is better in a…

背面 (解答)

Solid and liquid, but not gases

#20
正面 (问题)

What is toothpaste or baking powder?

背面 (解答)

Alkali

#21
正面 (问题)

Bromothymol Blue

背面 (解答)

• used for testing pH, and testing photosynthesis and respiration • similar colour change to UI • yellow at low pH, and blue at high pH

#22
正面 (问题)

Where are indicators used in the world?

背面 (解答)

• soil-testing kits • swimming pools are acidic due to chlorine, and can be tested

#23
正面 (问题)

Are alkalis corrosive?

背面 (解答)

Very corrosive

#24
正面 (问题)

Are acids corrosive?

背面 (解答)

Very corrosive