Acid-Base Neutralisation: Do Now Challenge

Chemistry / ScienceYear 1112 slidesNew Zealand curriculum

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Slide 1

Acid-Base Neutralisation: Do Now Challenge

Year 11 Chemistry 10 minutes of focused practice Real-world applications and reactions

Slide 2

Question 1: Basic Neutralisation

Write the balanced chemical equation for the neutralisation reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) Include states of matter Name the products formed

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Question 2: Counting Atoms

In the reaction: H2SO4 + 2NaOH → Na2SO4 + 2H2O Count the total number of hydrogen atoms on each side Count the total number of oxygen atoms on each side Verify the law of conservation of mass

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Question 3: Real-World Application

A farmer notices their soil pH is 4.5 (acidic) What type of substance should they add to neutralise the soil? Give a specific example of a compound they could use Explain why this is important for plant growth

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Question 4: Stomach Acid Relief

Stomach acid contains HCl with a pH around 1.5 Antacid tablets contain Mg(OH)2 (magnesium hydroxide) Write the neutralisation equation Calculate how many moles of HCl can be neutralised by 1 mole of Mg(OH)2

Slide 6

Question 5: Environmental Impact

{"left":"Acid rain (pH 3-4) damages buildings and forests\nCoal burning releases SO2 which forms H2SO4 in atmosphere\nLimestone buildings react: CaCO3 + H2SO4 → CaSO4 + H2O + CO2","right":"Lakes become acidic, killing fish and plants\nGovernments add lime to affected lakes\nNeutralisation: CaCO3 + 2H+ → Ca2+ + H2O + CO2"}

Slide 7

Question 6: Swimming Pool Chemistry

A swimming pool has a pH of 6.8 (too acidic) The ideal pH range is 7.2-7.6 What chemical could be added to raise the pH? Write a neutralisation equation using sodium carbonate (Na2CO3)

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Question 7: Industrial Application

A factory produces acidic wastewater with pH 2 Before discharge, it must be neutralised to pH 7 They use calcium hydroxide Ca(OH)2 Why is this neutralisation essential for environmental protection? What happens if acidic water enters rivers?

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Question 8: Balanced Equations Challenge

Balance these neutralisation equations: ___Al(OH)3 + ___HNO3 → ___Al(NO3)3 + ___H2O ___Ba(OH)2 + ___H3PO4 → ___Ba3(PO4)2 + ___H2O Check your atom count for each element

Slide 10

Question 9: Health and Safety

A student accidentally spills concentrated sulfuric acid on their hand Should they immediately neutralise it with sodium hydroxide? Why or why not? What is the correct first aid procedure? Explain the chemistry behind your answer

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Question 10: Titration Calculation

25.0 mL of 0.1 M HCl is neutralised by 20.0 mL of NaOH solution Calculate the molarity of the NaOH solution Show your working using: moles = M × V What volume of 0.05 M HCl would neutralise 10.0 mL of this NaOH?

Slide 12

Challenge Complete!

"Understanding acid-base neutralisation helps us solve real problems - from treating heartburn to protecting our environment." Review your answers Discuss any challenging questions Connect chemistry to everyday life