Acid and Base

Acid and Alkali Revision

by Dorithy Apau

Multiple Select

Which of the following are the physical properties of acid?

• taste bitter

• corrosive

• pH value 10

• Turns blue litmus paper red

Multiple Select

Which of the following are the physical properties of alkali?

• Turns red litmus paper blue

• React with metal to produce hydrogen gas

• pH value is 1

• Taste bitter

Multiple Select

Which of the following fruits have acidic properties?

Multiple Choice

If a substance has pH value of 1, that means it is a....

• strong acid

• weak acid

• strong alkali

• weak alkali

Multiple Choice

If a substance has pH value of 14, that means it is a....

• strong acid

• weak acid

• strong alkali

• weak alkali

Multiple Choice

If a substance has pH value of 4, that means it is a....

• strong acid

• weak acid

• strong alkali

• weak alkali

Multiple Choice

If a substance has pH value of 8, that means it is a....

• strong acid

• weak acid

• strong alkali

• weak alkali

Multiple Choice

The stronger an acid, the smaller its pH value.

• True

• False

Multiple Choice

The stronger an alkali, the smaller its pH value.

• True

• False

Multiple Choice

The stronger an acid, the smaller its pH value.

• True

• False

Fill in the Blanks

Multiple Choice

Name the process that takes place when an acid reacts with an alkali

• Titration

• Neutralization

• Decomposition

• Photosynthesis

Multiple Choice

A reaction between acid and alkali can be carried out using the method shown in the diagram. What is the name of the method used in this activity?

• Neutralization

• Titration

​Titration

• ​Indicator is a substance used to indicate whether a substance is acidic or alkaline.

• ​Indicator used in neutralization: Phenolphthalein

• ​Phenolphthalein is pink in alkali and colourless in acid and neutral solution.

​Acid-Base Indicator

​Red

Multiple Choice

Bee stings or ant bites that are ______ can be neutralized by applying ________ lotions.

• acidic; alkaline

• alkaline; acidic

• acidic; neutral

• alkaline; neutral

Multiple Choice

Predict the colour change at the end point (neutral point) if the phenolphthalein is replaced by universal indicator.

• colourless to pink

• pink to colourless

• purple to green

• green to purple