What is the reaction between copper nitrate and potassium hydroxide?

They will combine to form copper(II) hydroxide, an insoluble liquid that precipitates out of the solution. The other product will be aqueous potassium nitrate, which, as its name suggests, will exist as ions in the aqueous solution.

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a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.