You are given a 0.25 m solution of sodium citrate. how would you make 3 ml of a 25-fold dilution?

By adding 2.88 milliliter of water to the 0.12 milliliter of 0.25 M solution of sodium citrate will give 25-fold diluted solution.

Explanation:

25 fold dilution means that the concentration of solution is reduced by one by twenty fifth times of the original solution.

Fold - dilution =

V =Volume of original solution before dilution

V' = Total Volume of solution after dilution

V = x

V'= 3

x =

Total Volume of solution after dilution = V + y

y = Amount of solvent added ( here is water)

V + 3 = 3 mL

Volume of water added = 2.88 mL

Volume of original solution  = 3 ml - 2.88 ml = 0.12 mL

By adding 2.88 milliliter of water to the 0.12 milliliter of 0.25 M solution of sodium citrate will give 25-fold diluted solution.

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.