Podcast
Questions and Answers
What ion do bases generate in water?
What ion do bases generate in water?
Hydroxide (OH-)
What term is used to describe bases that are soluble in water?
What term is used to describe bases that are soluble in water?
Alkalis
Name one physical property of alkalis described in the text.
Name one physical property of alkalis described in the text.
Soapy to touch
What type of reaction is a neutralization reaction between an acid and a base?
What type of reaction is a neutralization reaction between an acid and a base?
In the neutralization reaction, what two ions combine to form water?
In the neutralization reaction, what two ions combine to form water?
Is dissolving an said or base in water an exothermic or endothermic process?
Is dissolving an said or base in water an exothermic or endothermic process?
When mixing concentrated acid with water, should you add water to acid, or acid to water?
When mixing concentrated acid with water, should you add water to acid, or acid to water?
What might happen if water is added to concentrated acid?
What might happen if water is added to concentrated acid?
Besides splashing, what else might happen to the container when mixing water and concentrated acid incorrectly?
Besides splashing, what else might happen to the container when mixing water and concentrated acid incorrectly?
What is the chemical formula for water?
What is the chemical formula for water?
Flashcards
Hydroxide ion
Hydroxide ion
An ion composed of one oxygen and one hydrogen atom (OH–).
Alkali
Alkali
A base that is soluble in water and generates hydroxide ions.
Neutralisation reaction
Neutralisation reaction
The reaction between an acid and a base to produce a salt and water.
Exothermic process
Exothermic process
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Endothermic process
Endothermic process
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Concentrated acid
Concentrated acid
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Safety in mixing acids and bases
Safety in mixing acids and bases
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Sodium hydroxide
Sodium hydroxide
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Magnesium hydroxide
Magnesium hydroxide
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Temperature change in reactions
Temperature change in reactions
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Study Notes
Bases and Alkalis
- Bases generate hydroxide (OH-) ions in water.
- Bases that dissolve in water are called alkalis.
- All bases do not dissolve in water.
Neutralisation Reaction
- Acid + Base → Salt + Water
- H+(aq) + OH-(aq) → H₂O(l)
Activity 2.10
- Take 10 mL water in a beaker
- Add a few drops of concentrated H₂SO₄,to it and swirl the beaker slowly.
- Touch the base of the beaker.
- Is there a change in temperature?
- Is this an exothermic or endothermic process?
- Repeat the above activity with sodium hydroxide pellets
Dissolving Acids/Bases
- Dissolving an acid or base in water is highly exothermic.
- Concentrated acids/bases should be added slowly to water, with constant stirring.
- Adding water to concentrated acids/bases can cause splashing and burns.
- Mixing an acid or base with water decreases the concentration of ions (H₃O⁺/OH⁻) per unit volume, this is called dilution.
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