The pH of a solution prepared by dissolving 0.350 mol of solid dimethylamine hydrochloride ((CH3)2NH2Cl) in 1.00 L of 1.10 M dimethylamine ((CH3)2NH) is . The Kb for methylamine is 5.40 ⋅ 10-4. (Assume the final volume is 1.00 L.)

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

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