Drain soaked chickpeas, then rinse and drain again. Place the chickpeas in a large pot with 10 cups of water, bring to a boil. Reduce the heat to low and simmer 90 minutes. Stir in 1tsp baking soda, if desired, after the first 1 hour to get creamy smooth chickpeas. Remove from heat, cover pot and let stand for 30 minutes. Skim off any chickpeas that have floated on top. Drain well.