When carbon dioxide “dissolves” in water, essentially all of it reacts to form carbonic acid, H2CO3:
CO2(g) + H2O(1) ↔ H2CO3(aq).
The carbonic acid can then dissociate into H+ and bicarbonate ions,
H2CO3(aq) ↔ H+(aq) + HCO−(aq).
(The table at the back of this book gives thermodynamic data for both of these reactions.) Consider a body of otherwise pure water (or perhaps a raindrop) that is in equilibrium with the atmosphere near sea level, where the partial pressure of carbon dioxide is 3.4 × 10−4 bar (or 340 parts per million). Calculate the molality of carbonic acid and of bicarbonate ions in the water, and determine the pH of the solution. Note that even “natural” precipitation is somewhat acidic.
Nutrition Overview --- August 23 Interesting Facts: We eat 70,000 meals within our lifetime. That equals 60,000 tons of food and totals 4 years of eating. Major health problems can be avoided by a healthy diet, moderate calorie intake, and adequate physical activity. Top leading causes of death in the United States are smoking, obesity, and alcohol abuse. Too much nutrients or a lack of nutrients can lead to chronic diseases. Food flavor, texture, and appearance are the primary influence on our food choices. o In reality, it should be health and nutrition concerns. Hunger Games Hunger: biological drive to eat. o Controlled by internal body mechanism. o Con