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.

Why is nh3 classified as a polar molecule

Salicylic acid is a very important acid. it is used to synthesize the aspirin by treating with acetic anhydride. a 0.2015-g sample of salicylic acid was dissolved in a 100.00-ml volumetric flask, and the solution was diluted to the mark. a 10-ml aliquot of this solution was titrated with standard naoh (0.01130 + 0.2% n) to a phenolphthalein faint pink color end point at 19.81 ml. (a) (calculate the normality of the salicylic acid solution used in the titration. (b) assuming the salicylic acid is pure, what is the equivalent weight of the salicylic acid? practice problems for the final exam (continued) (c) (calculate the inherent error in the determination of the equivalent weight you calculated in part (b). use the following absolute errors in the equipment /glassware when calculating the inherent error. 5.00-ml pipet: + 0.02 ml 100-ml volumetric flask: + 0.08 ml analytical balance: + 0.2 mg 25-ml buret: + 0.03 ml

Which of the following is the correct formula for copper (i) sulfate trihydrate? cuso4 · 3h2o cuso4(h2o)3 cu2so4(h2o)3 cu2so4 · 3h2o