indicators

Question 1

what are indicators

Answer 1

weak acids where hin and I- are different colors

Question 2

what are the colors of methyl orange

Answer 2

red at low ph and yellow at high ph changes color between 3.1-44

Question 3

what are the colors of phenothaplein

Answer 3

colorless at low ph and pink at high ph 8.3-10

Question 4

why does acids change the color of methyl orange

Answer 4

there are h+ ions which increase the concentration on the right hand side this cause the equilibrium to the left to oppose the change thus why we see a red color as this is the hin color

Question 5

why does acid change to yellow at high ph

Answer 5

the h+ ions react with oh- which remove the h+ ions producing water thus the equilibrium shifts to the right to replace the lost h+ ions thus we see the in- color

Question 6

what indicators do we use

Answer 6

we must use ph indicator that vertical reigions lie in which the indicator changes color so that we cann an endpoint