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3.2 Identify four properties of water that are important for life and describe how they result from hydrogen bonding. 3.3 Differentiate between an acid and a base; define pH and describe how it affects the processes of life. Living systems depend on properties of water that result from its polarity and hydrogen bonding.
Explain why water is an excellent solvent. Provide examples of water’s cohesive and adhesive properties. Discuss the role of acids, bases, and buffers in homeostasis. Watch a video about why we need oxygen and how it causes problems for living things. Do you ever wonder why scientists spend time looking for water on other planets?
pH, Acids, Bases, and Buffers. The pH of a solution is a measure of its acidity or alkalinity. You have probably used litmus paper, paper that has been treated with a natural water-soluble dye so it can be used as a pH indicator, to test how much acid or base (alkalinity) exists in a solution.
Explain why water is an excellent solvent. Provide examples of water’s cohesive and adhesive properties. Discuss the role of acids, bases, and buffers in homeostasis. Why do scientists spend time looking for water on other planets? Why is water so important? It is because water is essential to life as we know it.
Water is a common chemical substance on planet Earth. In fact, Earth is sometimes called the "water planet" because almost 75% of its surface is covered with water. If you look at Figure below, you will see where Earth’s water is found.
Each molecule of water consists of one atom of oxygen and two atoms of hydrogen, so it has the chemical formula H 2 O. The arrangement of atoms in a water molecule, shown in Figure \(\PageIndex{2}\), explains many of the water’s chemical properties.
A liquid that is a completely homogenous mixture of two or more substances is called a solution. The The dissolving agent is the solvent , and the substance that is dissolved is the solute .
