IDNStudy.com, ang iyong destinasyon para sa malinaw na mga sagot. Alamin ang mga detalyadong sagot mula sa mga bihasang miyembro ng aming komunidad na sumasaklaw sa iba't ibang paksa para sa lahat ng iyong pangangailangan.

A certain solution contains 7 micro moles of Pb. What amount of solvent Pb should be diluted in order to attain a 3.09x10⁵ ppm of concentration?​

Sagot :

Solution:

Step 1: Calculate the mass of Pb.

Note: 1 micromole = [tex]\it{1 × 10^{-6}}[/tex] mole

mass of Pb = moles of Pb × molar mass of Pb

mass of Pb = [tex]7 × 10^{-6}[/tex] mol × 207.2 g/mol

mass of Pb = 0.0014504 g

Step 2: Calculate the mass of solvent.

[tex]\text{parts per million} = \frac{\text{mass of Pb}}{\text{mass of Pb + mass of solvent}} × 10^{6}[/tex]

[tex]3.09 × 10^{5} = \frac{\text{0.0014504 g}}{\text{0.0014504 g + mass of solvent}} × 10^{6}[/tex]

[tex]0.309 = \frac{\text{0.0014504 g}}{\text{0.0014504 g + mass of solvent}}[/tex]

[tex]0.309(\text{0.0014504 g + mass of solvent}) = \text{0.0014504 g}[/tex]

[tex]\text{0.00044817 g + 0.309(mass of solvent) = 0.0014504 g}[/tex]

[tex]\text{0.309(mass of solvent) = 0.0014504 g} - \text{0.00044817 g}[/tex]

[tex]\text{0.309(mass of solvent) = 0.00100223 g}[/tex]

[tex]\text{mass of solvent} = \frac{\text{0.00100223 g}}{0.309}[/tex]

[tex]\text{mass of solvent = 0.00324 g}[/tex]

Note: 1 mg = [tex]\it{1 × 10^{-3}}[/tex] g.

[tex]\boxed{\text{mass of solvent = 3.24 mg}}[/tex]

#CarryOnLearning