Topic 8 - Acids

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Total cards: 21•Content version: v4•Public deck•Updated: 8/1/2026

Card preview (21)

Front (Question)

Describe red litmus paper colour changes

Back (Answer)

Acid: red Neutral: red Alkali: blue

Front (Question)

Describe blue litmus paper colour changes

Back (Answer)

Acid: red Neutral: blue Alkali: blue

Front (Question)

Describe methyl orange colour changes

Back (Answer)

Acid: red Neutral: yellow-orange Alkali: yellow-orange

Front (Question)

Describe phenolphthalein colour changes

Back (Answer)

Acid: colourless Neutral: colourless Alkali: pink

Front (Question)

What is universal indicator used for

Back (Answer)

To approximate pH It is a broad range indicator Goes from red -> green -> blue A combination of dyes

Front (Question)

What is an acid?

Back (Answer)

H+ donor (proton donor)

Front (Question)

What is an alkali

Back (Answer)

OH- donor A soluble base

Front (Question)

What is a base

Back (Answer)

H+ acceptor (proton acceptor) Metal oxide/hydroxide Alkalis that are insoluble in water

Front (Question)

Describe the general formula for (dilute) acid + metal reactions

Back (Answer)

Acid + metal -> salt + H2

#10

Front (Question)

What is a salt?

Back (Answer)

A compound formed when a hydrogen is displaced from an acid An ionic compound formed during a neutralisation reaction

#11

Front (Question)

Which metals are not reactive enough to react with an acid

Back (Answer)

Copper, silver and gold

#12

Front (Question)

Which metals are too reactive to react with an acid

Back (Answer)

Potassium, sodium, lithium and calcium

#13

Front (Question)

Describe the general formula for acid + base reactions

Back (Answer)

acid + base -> salt + water

#14

Front (Question)

Describe the general formula for an acid + carbonate reaction

Back (Answer)

Acid + carbonate -> salt + water + carbon dioxide

#15

Front (Question)

What is limewater?

Back (Answer)

Saturated calcium hydroxide solution

#16

Front (Question)

How to prove the metal reactivity trend?

Back (Answer)

1) set up 3 boiling tubes and fill them with equal volumes of dilute HCl/H2SO4 2) place pieces of magnesium, zinc and iron into separate test tube (control size, shape, mass) 3) the speed of reaction is indicated by rate at which bubbles of hydrogen are given off 4) confirm the hydrogen with the squeaky pop test

#17

Front (Question)

Describe the pH scale

Back (Answer)

0-3: strongly acidic 4-6: weakly acidic 7: neural 8-10: weakly alkaline 10-14: strongly alkaline

#18

Front (Question)

What is an indicator?

Back (Answer)

A dye which changes colour

#19

Front (Question)

What colour is plain litmus in neutral solutions?

Back (Answer)

Purple

#20

Front (Question)

Describe the equation for acid + base neutralisation

Back (Answer)

H+ (aq) -> OH- (aq) -> H2O (l) The acid donates the protons which are accepted by the base. The products are always neutral.

#21

Front (Question)

Describe the equation for acid + ammonia

Back (Answer)

Acid + ammonia -> ammonium salt E.g: HNO3(aq) + NH3(aq) -> NH4NO3(aq)