Amysterious white powder is found at a crime scene. a simple chemical analysis concludes that the powder is a mixture of sugar and morphine (c17h19no3), a weak base similar to ammonia. the crime lab takes 10.00 mg of the mysterious white powder, dissolves it in 100.00 ml water, and titrates it to the equivalence point with 2.84 ml of a standard 0.0100 m hcl solution. what is the percentage of morphine in the white powder?

a. 8.10%
b. 17.3%
c. 32.6%
d. 49.7%
e. 81.0%

e. 81.0%

Explanation:

Morphine has Molar mass = 285.34 g/mol

Also, number of males of Morphine = Number of moles of HCl

(At equivalence point )

Now, number of moles of HCl = Molarity × volume

=0.01 mol × 2.84×10^(-3) L

= 2.84×10^(-5) mol

therefore number of moles of morphine= 2.85×10^(-5)

Mass of Morphine= No. of moles × molar mass

= 2.84×10^(-5)×285.34 g/mol

= 0.0081 g

= 8.1 mg

therefore

percentage of morphine = mass of morphine/ mass of powder×100%

= 8.1/10×100% = 81.0%

hence option e is correct.

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.

c. is the answer

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