acids, alkalis and titrations

Question 1

where is litmus paper extracted from

Answer 1

lichens

Question 2

what are synthetic indicators

Answer 2

organic compounds that are sensitive to changes in acidity and appear in different colors

Question 3

what are 2 synthetic indicators

Answer 3

phenolphthalein
methyl orange

Question 4

phenolphthalein

Answer 4

acid= colorless
alkali = pink

Question 5

methyl orange

Answer 5

acid= red
alkali= yellow

Question 6

litmus paper

Answer 6

acid= red
alkali= blue

Question 7

why are synthetic indicators used

Answer 7

shows an endpoint in titrations and have sharp change of color

Question 8

PH scale

Answer 8

goes from 0-14
>7 = acidic
<7= alkali
7= neutral

Question 9

universal indicator

Answer 9

wide range indicator and can only give approximate values

Question 10

what forms when acids are added to water

Answer 10

H+ ions

Question 11

what forms when an alkali is added to water

Answer 11

OH-

Question 12

Neutralisation

Answer 12

when an acid reacts with an alkali

Question 13

what is produced in a neutralization reaction

Answer 13

H20

Question 14

what can neutralisation reactions be used in

Answer 14

treatment of soils

Question 15

titrations

Answer 15

method of analysing the conc. of solutions

Question 16

why are neutralisation reactions important

Answer 16

determines exactly how much alkali is needed to neutralise an acid

Question 17

what can titrations be used for

Answer 17

to prepare salts