Problem: A certain indicator, HA, has a Ka value of 0.00063. The protonated form of the indicator is blue and the ionized form is yellow. What is the pKa of the indicator? What is the color of this indicator in a solution with pH = 5?           (a) green           (b) yellow          (c)  blue

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A certain indicator, HA, has a Ka value of 0.00063. The protonated form of the indicator is blue and the ionized form is yellow. 

What is the pKa of the indicator? 

What is the color of this indicator in a solution with pH = 5? 

          (a) green 

          (b) yellow

          (c)  blue