Exploring Acids, Bases & Salt Reactions
Exploring Acids, Bases & Salt Reactions
Lesduur is: 45 minOnderdelen in deze les
Exploring Acids, Bases & Salt Reactions
What do you already know about how acids and bases .
Learning Objective
At the end of the lesson you will be able to identify and describe key reactions involving acids, bases, and metals, test for hydrogen and carbon dioxide gases, and answer CBSE Board-style questions on this topic.
Acid + Metal → Salt + Hydrogen
When acids react with metals, they form a salt and release hydrogen gas. Example: Zn + 2HCl → ZnCl₂ + H₂↑. Test for hydrogen using the pop test.
Pre-Assessment: Gases from Reactions
When passed through limewater, CO₂ turns it milky. This tests for CO₂ typically in acid-carbonate reactions.
A burning splint creates a 'pop' sound in the presence of hydrogen gas. This tests if hydrogen is produced during an acid-metal or base-metal reaction.
Carbon Dioxide Gas Test
Hydrogen Gas Test
Acid + Base → Salt + Water
This is a classic neutralisation reaction. Example: HCl + NaOH → NaCl + H₂O. No gas evolved; only salt and water are formed.
Base + Metal → Salt + Hydrogen
Some bases (like NaOH) react with certain metals (like Zinc,aluminium) to form salt and hydrogen gas. Example:
On-going Assessment
Question: Write balanced equations for the reactions of (a) hydrochloric acid with zinc, (b) sodium hydroxide with aluminium, and (c) hydrochloric acid with sodium hydroxide. Identify the products in each case.
Write down 3 things you learned in this lesson.
Write down 2 things you want to know more about.
Ask 1 question about something you haven't quite understood yet.
CBSE Board-Style Question
Question: (CBSE, 2019) A student adds some dilute HCl to a test tube containing zinc granules. Write the equation for the reaction and describe what you observe. How will you test the evolved gas? Name the gas.
