Base your answers to questions 77 and 80 on the
information below and on your knowledge of chemistry.
A company produces a colorless vinegar
that is 5.0% HC2H3O2 in water.
Using thymol blue as an indicator, a student titrates a 15.0-milliliter
sample of the vinegar with 43.1 milliliters of a 0.30 M NaOH(aq)
solution until the acid is neutralized.
77 Based on Table M, what is the color
of the indicator in the vinegar solution before any base is added? 
78 Identify the negative ion in
the NaOH(aq) used in this titration. 
79 The concentration of the base
used in this titration is expressed to what number of significant
80 Determine the molarity of the
HC2H3O2 in the vinegar sample,
using the titration