Acids and Alkali
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16 Terms
What substances have a sour taste and turn blue litmus paper red?
Acids
What are three examples of acids?
Lemon juice, vinegar, fizzy drinks
What is the pH range of acids?
Less than 7
What can be observed when a strong acid is tested on a universal indicator?
It turns red.
What happens to red litmus paper when it is exposed to alkalis?
It turns blue.
What are substances that dissolve in water and feel slippery or soapy?
Alkalis
What is the pH range of alkalis?
Greater than 7
What is the chemical reaction called when an acid reacts with an alkali?
Neutralisation
What do you produce from the reaction of an acid and an alkali?
Salt and water
What is produced when acids react with metals?
Hydrogen gas (H₂)
What is the observation when acids react with metals?
Bubbles or fizzing.
How do you test for hydrogen gas?
Bring a lit splint near it to hear a 'pop' sound.
What color does a weak alkali turn on a universal indicator?
Blue.
What color does a strong alkali turn on a universal indicator?
Purple.
What safety precautions should be taken when handling acids and alkalis?
Always wear goggles and gloves.
Complete the neutralisation reaction: Acid + Alkali →?
Salt + Water.
