In a small bowl mix flour and baking soda together. Put melted chocolate mixture in a large bowl. Add sugar and beat for about 5 minutes until smooth. With mixer add vanilla, and gradually add water. Add eggs one at a time and beat after each addition. With mixer on low add flour mixture until blended. Fold in remaining 1 1/2 cups semi-sweet chocolate chips. Pour into a greased 10 inch round pan.
Bake at 325 for 35 to 45 minutes. Cool. Store in refrigerator