acids and bases

Question 1

where does the pH scale start and end

Answer 1

0-14

Question 2

what number and color are acidic

Answer 2

0-5
red

Question 3

what number and color are neutral

Answer 3

7
green

Question 4

what number and colour is alkali

Answer 4

8-14
blue/purple

Question 5

what is an indicator

Answer 5

a dye that changes color

Question 6

what is universal indicator

Answer 6

• a useful combination of dyes
• which gives color to find the pH of an aqueous solution
• add it to a solution and compare to pH scale

Question 7

what colors does litmus paper go

Answer 7

test whether a solution is acid or alkaline
- changes color at pH 7
- red in acidic
- purple in neutral
- blue in alkaline

Question 8

what colors does phenolphthalein go

Answer 8

-colourless in acidic solution
-bright pink in alkaline solutions

Question 9

what colors does methyl orange go

Answer 9

red in acidic solutions
yellow in alkaline solutions

Question 10

how are acids neutralized

Answer 10

adding bases

Question 11

what ions do acids contain

Answer 11

hydrogen ions (H+)

Question 12

what kind of donors are acids

Answer 12

proton donors

Question 13

what ions do alkalines contain

Answer 13

hydroxide ions (OH-)

Question 14

what kind of protons are bases

Answer 14

proton acceptors

Question 15

alkalines are ? in bases

Answer 15

soluble