The concentration of SO42-(aq) in a sample of river water can be determined using a precipitation titration in which a salt of Ba2+(aq) is
the standard solution and BaSO4(s) is the precipitate formed. What is
the concentration of SO42-(aq) in a 46.1 mL sample if 7.00 mL of a
0.00100 M Ba2+(aq) solution is needed to precipitate all the SO42-(aq)
in the sample?
M

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.

stratosphere, is the answer for (apex)