topic 5 - Acids & Bases

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

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Front (Question)

What is the pH scale a measure of?

Back (Answer)

how acidic a solution is

Front (Question)

what is the pH scale measured in?

Back (Answer)

a continuous range of numbers from before 0 to after 14

Front (Question)

How is pH usually found?

Back (Answer)

adding a pH indicator to a solution of a substance. (as well as pH paper and pH meters) (Usually does not work if its not soluble)

Front (Question)

what are pH indicators?

Back (Answer)

chemicals which can change colour depending on the pH of the solution

Front (Question)

At what pH value is a substance an acid?

Back (Answer)

less than 7 is acid (exact wording)

Front (Question)

At what pH value is a substance an alkali?

Back (Answer)

greater than 7 is an alkali (exact wording)

Front (Question)

At what pH value is a substance neutral?

Back (Answer)

equal to 7 (exact wording)

Front (Question)

what type of bonding do all acids and alkali?

Back (Answer)

they are all ionic

Front (Question)

what strength of conduction do all acids and alkali solutions have?

Back (Answer)

good conductivity (all Ionic so all conductors)

#10

Front (Question)

what does dissociate mean?

Back (Answer)

break up (used instead of break up)

#11

Front (Question)

what is the equation for the dissociation of water molecules?

Back (Answer)

H2O (l) ⇌ H+ (aq) + OH- (aq) (⇌ = reversible/equilibrial) (displays that its neutral as there are equal parts of both)

#12

Front (Question)

what is the concentration of H+ (aq) and OH- (aq) in a neutral solution?

Back (Answer)

equal concentrations of both

#13

Front (Question)

What so acidic solutions have a higher concentration of? (And what does that mean for their pH)

Back (Answer)

H+ ions than OH- ions And pH below 7

#14

Front (Question)

What so alkaline solutions have a higher concentration of? (And what does that mean for their pH)

Back (Answer)

OH- ions than H+ ions And pH above 7

#15

Front (Question)

If a soluble substance is added to water and it alters the concentration of hydrogen ions, will the pH of the water change?

Back (Answer)

Yes

#16

Front (Question)

What is pH a measure of?

Back (Answer)

The concentration of hydrogen ions in a solution (Higher the concentration the lower the number)

#17

Front (Question)

What is the general colours on the universal indicator chart?

Back (Answer)

Acidic: 1-3 = red 4-5 = orange 6 = yellow Neutral: 7 = green Alkali: 8-10 = blueish 11-14 = purple and pink

#18

Front (Question)

What happens to the pH as the concentration of hydrogen ions increases?

Back (Answer)

The pH decreases

#19

Front (Question)

What is the equation for hydrogen ions and hydroxide ions in acids?

Back (Answer)

H+ (aq) > OH- (aq)

#20

Front (Question)

What is the equation for hydrogen ions and hydroxide ions in alkali?

Back (Answer)

OH- (aq) > H+ (aq)

#21

Front (Question)

What is the equation for hydrogen ions and hydroxide ions in a neutral?

Back (Answer)

OH- (aq) = H+ (aq)

#22

Front (Question)

What is the formula (+ionic) for Hydrochloric acid?

Back (Answer)

HCl H+Cl-

#23

Front (Question)

What is the formula (+ionic) for nitric acid?

Back (Answer)

HNO3 H+NO3-

#24

Front (Question)

What is the formula (+ionic) for sulfuric acid?

Back (Answer)

H2SO4 (H+)2 SO4 2-