Sift flour and bicarb soda into a large bowl, once done stir in the sugar. Whisk the egg yolks and milk together in a medium bowl until combined, add to flour. Mix together flour and egg mix until well combined. Beat the egg whites in a seperate bowl until soft peaks are formed. Mix a small amount of the egg whites into the pancake mixture, and gently fold the rest into the mixture. Put a medium sized frypan on low heat, and add a dab of butter. Once butter is melted, use a ladel or a large tablespoon to dob in a large amount of mixture into the pan. Use the handle of the pan to spread the mixture evenly across the pan until a fairly even pancake is formed. Cook until underside is golden, then flip and cook other side. Repeat until the whole mix is used.