Place pie crusts in 9 inch pie pans. Chill the crusts approximately 1 hour before use.
Preheat oven to 425 degrees F (220 degrees C).
In a medium bowl, stir together the baking soda and warm water. Mix in the molasses and stir until foamy. Transfer the mixture to the pie crusts.
In a medium bowl, mix together flour, sugar and baking soda. Use a pastry blender to cut the butter into the flour mixture until very fine crumbs have formed. Sprinkle the crumbs over the molasses mixture in the pie crusts.
Bake in the preheated oven 10 minutes. Reduce heat to 350 degrees F (175 degrees C), and continue baking 35 minutes, or until crust is lightly browned and the filling has set.
