The concentration of sodium hydroxide is 1.0 M and the concentration of crystal violet is 1.00 x 10-5 M. Identify the limiting reagent and calculate how much of the excess reagent remains after the reaction runs to completion

To determine which is the limiting reactant and the excess reactant, we need to determine the number of moles we have for the reaction to be used. We assume to have 1 liter solution of each reactant. We do the following:

C25N3H30Cl + NaOH = C25N3H30OH + NaCl

1.0 M NaOH (1 L) = 1.0 moles NaOH

1.00 x 10-5 M C25N3H30Cl (1 L) = 1.00 x 10-5 moles C25N3H30Cl

Therefore, the limiting reactant is crystal violet and the excess reactant is NaOH.