Consider the following indicators and their ph ranges:
methyl orange 3.2-4.4
methyl red 4.8-6.0
bromothymol blue 6.0-7.6
phenolphthalein 8.2-10.0
alizarin yellow 10.1-12.0
assume an indicator works best when the equivalence point of a titration comes in the middle of the indicator range. for which of the following titrations would methyl red be the best indicator?
a) 0.100m hno3+0.100m koh.
b) 0.100m aniline(kb=3.8×10^-10)+0.100m hcl.
c) 0.100m nh3(kb=1.8×10^-5)+0.100m hcl.
d) 0.100m hf(ka=7.2×10^-4)+0.100m naoh.
e) 0.100m acetic acid(ka=1.8×10^-5)+0.100m naoh.