When water ionizes, it produces equal amounts of hydrogen and hydroxide ions that can reassociation with each other. The pH of water is:

Explanation:

ionic product of water Kw = 10⁻¹⁴

[H⁺] [  OH⁻ ] = 10⁻¹⁴

[H⁺] ² = 10⁻¹⁴

[H⁺] = 10⁻⁷

Water dissociates as follows .

H₂O     ⇄     H⁺      +     OH⁻

                  10⁻⁷M       10⁻⁷ M

pH = - log [H⁺]

= - log [  10⁻⁷ ]

= 7 .

So pH of pure water solution = 7 .

answer: the figure is attached herewith.

step-by-step explanation:   we are given to sketch a unit circle and label the terminal points corresponding to

in the attached figure, we have drawn a unit circle, with centre at o(0,0) and radius 1 unit. we have labelled the points a, b, c, d and e corresponding to the angles below

∠aox = 60°,

∠box = 120°,

∠cox = 180°,

∠dox = 240°,

∠eox = 300°.

and the coordinates are a(0.5,1), b(-0.5,1), c(-1,0), d(-0.5,-1) and e(0.5,-1).

thus, the answer is complete.