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Chapter 18: Q18P (page 457)

A compound with molecular mass 292.16g/molwas dissolved in a 5 - mLvolumetric flask. A1.00 - mLaliquot was withdrawn, placed in a 10 - mLvolumetric flask, and diluted to the mark. The absorbance atwas in 0.427 i acuvet. The molar absorptivity at 340nm is蔚340=6130M-1cm-1

(a) Calculate the concentration of compound in the cuvet.

(b) What was the concentration of compound in the 5 - mL flask?

(c) How many milligrams of compound were used to make the 5 - mLsolution?

Short Answer

Expert verified

a) The concentration of compound in the cuvetc=6.97.10-5M

b) The concentration of compound in the 5 - mL flaskc=6.97.10-4Mc

c) The milligrams of compound used to make the 5 - mL solution m = 1.02mg

Step by step solution

01

Define concentration

The concentration of a substance is the quantity of solute presentin a given quantity ofsolution. Concentrations are usually expressed in terms of molarity, defined as the number of moles of solute in 1 L of solution.

02

Concentration of compound

Diluted 10 times

c=6.97.10-4M

03

Concentration in Milligrams

n=3.48.10-6molMassm=n.M=3.48.10-6mol.292.16g/molm=1.02mg

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