A solution is made by dissolving 1.00 g of the ligand bipyridine (CI0H_8N2) in e

Question

A solution is made by dissolving 1.00 g of the ligand bipyridine (CI0H_8N2) in enough water to make 1.00 L of solution. Determine the concentration of bipyridine in the following solutions: Take 10.0 ml of the original solution and add enough water to make 100. mL of solution. Take 0.40 mL of the original solution and mix in a cuvette with 0.50 mL of hydroxylamine and 1.40 ml. of iron solution. Mix 1.00 mL of the solution from part (a) with 1.20 ml. of hydroxylamine solution and 0.40 mL of iron solution.

Explanation / Answer

MW = 156.19

mol = 1/156.19 = 0.00640245 mol of bipyridine

M = 0.00640245 M

V = 1 L

a)

take 10 ml then add water to V2 = 100 ml

M1V1 = M2V2

0.00640245*10 = M2*100

M2 = 0.000640245

b)

take 0.4 ml and mix 0.5 ml and 1.4 ml

total ml = 0.5+1.4+0.4 = 2.3 ml

M1V1 = M2V2

M2 = M1V1/V2 = 0.4/2.3*0.000640245 = 0.00011134695 M

c)

take 1 ml of a and 1.2 ml + 0.4

V2 = 2.6

M2 = ?

M1 = 0.0011134695

V1 = 1

then

M2 = M1*V1/V2 = 0.00011134695*1/2.6 = 0.0000428 M

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