- #1
kirsten_2009
- 137
- 2
pH INDICATORS...I DONT GET IT :(
1. Homework Statement
Hello!
I don't really need homework help...I'm actually studying for my final exam and I have a couple of sample questions that I have no idea how I would go about solving. What I would appreciate is if someone could explain to me how to solve them rather than giving me the answer. Thank you so much for all your help and time in advance! :)
Q#1: Phenol red indicator changes from yellow to red in the pH range from 6.6 to 8.0. State what color the indicator will assume in the following solution: 0.1 M NaCl
a) yellow
b) red-yellow mixture
c) red
d) The indicator is its original color
e) There is not enough information to answer this question
Answer: C Red
Q#2: Phenol red indicator changes from yellow to red in the pH range from 6.6 to 8.0. State what color the indicator will assume in the following solution: 0.10 M NH4NO3
a) Red
b) Red-Yellow Mixture
c) Yellow
d) The indicator is its original color
e) There is not enough information to answer this question
Answer: C Yellow
I would think that a relevant equation would be pH = -log[H_3_O+] but not sure...
Clueless...
1. Homework Statement
Hello!
I don't really need homework help...I'm actually studying for my final exam and I have a couple of sample questions that I have no idea how I would go about solving. What I would appreciate is if someone could explain to me how to solve them rather than giving me the answer. Thank you so much for all your help and time in advance! :)
Q#1: Phenol red indicator changes from yellow to red in the pH range from 6.6 to 8.0. State what color the indicator will assume in the following solution: 0.1 M NaCl
a) yellow
b) red-yellow mixture
c) red
d) The indicator is its original color
e) There is not enough information to answer this question
Answer: C Red
Q#2: Phenol red indicator changes from yellow to red in the pH range from 6.6 to 8.0. State what color the indicator will assume in the following solution: 0.10 M NH4NO3
a) Red
b) Red-Yellow Mixture
c) Yellow
d) The indicator is its original color
e) There is not enough information to answer this question
Answer: C Yellow
Homework Equations
I would think that a relevant equation would be pH = -log[H_3_O+] but not sure...
The Attempt at a Solution
Clueless...