BIOL 110 Lecture 5: Biology 110 chapter 2 part 4

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A solution is a liquid that is a homogeneous mixture of substances. A solvent- is the dissolving agent of a solution. The solute- is the substance that is dissolved. An aqueous solution is one in which water is the solvent water is a versatile solvent due to its polarity, which allows it to form hydrogen bonds easily. When an ionic compound is dissolves in water, each ion is surrounded by a sphere of water molecules called a hydration shell. Water reaches its greatest density at 4-degree c. Biologists use something called the ph scale to describe whether a solution is acidic or basic. Adding certain solutes, called acids and bases, modifies the concentration of h+ and oh- Acid- is any substance that increases the h+ concentration of a solution. Base- is any substance that reduces the h+ concentration of a solution. The internal ph of most living cells must remain close to ph7.

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