Mark Levesley, Chris Meunier, Fran Eardley and, Gemma Young Solutions for Exercise 9: End of chapter review

The universal indicator turns a range of colours in acids and alkalis.

The table shows the $\mathrm{pH}$ range of different colours of the universal indicator.

A student tested five substances with universal indicator solution.

Copy the table and put one tick (✓) in each row to state whether the results show the substance is acidic, alkaline or neutral.

Bees and wasps are insects which use a sting to defend themselves. A wasp sting has a $\mathrm{pH}$ of $10$ and a bee sting has a $\mathrm{pH}$ of $2$.

Copy and complete the table about wasp and bee stings.

Bees and wasps are insects which use a sting to defend themselves. A wasp sting has a $\mathrm{pH}$ of $10$ and a bee sting has a $\mathrm{pH}$ of $2$. What would you add to a bee sting to neutralise it and stop it from hurting?

Tip: Can you think of any specific examples which would be safe?

Bees and wasps are insects which use a sting to defend themselves. A wasp sting has a $\mathrm{pH}$ of $10$ and a bee sting has a $\mathrm{pH}$ of $2$. What would you add to a wasp sting to neutralise it and stop it from hurting?

Tip: Can you think of any specific examples which would be safe?

Explain why scientists might find universal indicator more useful than litmus.

The table below shows the $\mathrm{pH}$ of four different soil samples which are labelled $\mathrm{A}-\mathrm{D}$.

Use letters from the table to answer the following question.

Which soil sample is neutral?

The table below shows the $\mathrm{pH}$ of four different soil samples which are labelled $\mathrm{A}-\mathrm{D}$.

Use letters from the table to answer the following question.

Cabbage grows better in alkaline soil. Which soil sample would be the best to grow cabbage in?

The table below shows the $\mathrm{pH}$ of four different soil samples which are labelled $\mathrm{A}-\mathrm{D}$.

Use letters from the table to answer the following question.

Potatoes grow better in slightly acidic soil. Which sample would be the best to grow potatoes in?