Indicators work because they are weak acids which when in solution, exist in equilibrium with their conjugate ... 5 min) Show the students that the HCl solution in the Erlenmeyer is colorless. Add 10 ...

Dilute solutions of Fe(NCS)2+ have their equilibrium positions shifted with the addition of Fe(NO3)3, KSCN, NaOH, and AgNO3. The ferric thiocyanate solution is blood red in color, and the intensity of ...