S3 SIS 7.1 Acids and Bases

Word Cloud

What are some examples of acids you have learnt from lower secondary?

Demo

Poll

Predict your observations when a blue and red litmus paper is dipped onto solid citrus acid.

• Blue litmus paper turns red.

  Red litmus paper remains red.

• Blue litmus paper remains blue.

  Red litmus paper turns blue.

• No change for both litmus paper.

Multiple Select

Which of the following substances are acids?

• CH₄

• CH₃COOH

• NH₃

• HNO₃

What are alkalis?

Multiple Choice

All bases produce hydroxide ions when dissolved in water.

• True

• False

Drag and Drop

Acids are proton ​​

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.

Bases are proton

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.

Alkalis are ​ ​

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bases.

Acids dissociate in water to produce ​

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ions.

Alkalis dissociate in water to produce ​

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ions

Drag these tiles and drop them in the correct blank above

acceptors

donors

soluble

hydrogen

hydroxide

insoluble

givers

positive

negative

Multiple Choice

Which statement is true?

• All bases are alkalis.

• All alkalis are bases.

How can we measure the acidity of a solution?

What does pH mean?

Drag and Drop

The ​

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the concentration of H+ ions, the ​ the ​

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pH of the solution

The ​

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the concentration of OH- ions, the ​

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the pH of the solution.

Drag these tiles and drop them in the correct blank above

higher

lower

Multiple Choice

A neutral solution contains no hydrogen and hydroxide ions.

• True

• False

Fill in the Blanks

How can the pH of a solution be measured?

Multiple Choice

A student is given four different colorless solutions and tests them using three common indicators. The results are recorded in the table.

Which of the following statements were true?

• Solution W is more acidic than solution Z.

• Solution Y is a neutral solution, such as distilled water.

• Solution X is a weak acid because it turned thymolphthalein blue.

• Solution Z is likely to have a pH of approximately 9.

Strong vs weak acids

Multiple Choice

There is a strong acid and a weak acid. Which diagram represents the strong acid?

• Left diagram

• Right diagram

Multiple Choice

Strong acids tend to have a _______ pH than weak acids as they have a _________ concentration of H⁺ ions.

• higher, higher

• higher, lower

• lower, higher

• lower, lower

Multiple Choice

A strong acid always has a lower pH than a weak acid.

• True

• False

Multiple Choice

Which diagram shows a dilute solution of a strong acid?

• 1

• 2

• 3

• 4

Multiple Choice

Which of the following acids (of equal concentration) has the highest electrical conductivity?

• Hydrochloric acid

• Sulfuric acid

• Methanoic acid

• Citric acid