Water is essential to all living things on Earth. Consider your body for example – it is about 65% water by weight. For every hour of vigorous exercise, you may lose as much as a half-gallon of your body’s water supply through sweating and exhaling! You also lose small amounts of salts when you sweat. If the lost water and dissolved salts are not replaced, eventually your body will stop functioning. You can replace lost fluid by drinking water. To quickly replace salts, many athletes consume sports drinks. Why is water such an important substance for living creatures?
Sweat and sports drinks are both examples of solutions – they are mostly water with dissolved substances. In this chapter, you will learn about solutions. You will also learn about some special solutions called acids and bases. Among other things, acids create the bitter taste in food and can dissolve some rocks. Bases
are slippery, like soap. Both acids and bases play a key role in maintaining your body’s internal chemical balance.
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