How are the temperatures of tropical seawater and polar seawater different?

Explanation:

o At the polar latitudes the surface temperature remains near the freezing point of sea water about -1.9°C. Pure water freezes at 0°C and boils at 100°C under normal pressure conditions. When salt is added the freezing point is lowered and the boiling point is raised

o The water temperature of tropical oceans thus typically exceeds 20°C and stays relatively constant troughout the year. Particularly intense radiation directly over the equator evaporates seawater and forms a mass of very warm, humid tropical air that subsequently rises and cools as it flows north and south

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when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.