First, get about 20 mL of the quinine stock solution in a clean beaker to prepare 250 mL of about 2 ppm quinine in 0.05 M H2SO4. Calculate the actual final concentration based on your dilution of the stock solution.

Question

Chemistry

Camilla

25 April, 07:17

First, get about 20 mL of the quinine stock solution in a clean beaker to prepare 250 mL of about 2 ppm quinine in 0.05 M H2SO4. Calculate the actual final concentration based on your dilution of the stock solution.

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Kathy Mcguire · Answer 1

Volume of acid, Va=250mL; Volume of quinine, Vb=20mL; Molarity of acid, Ma=0.05M.

Molar mass of acid = H2+S+O4 = 2+32 + (16X4) = 2+32+64=98g

Concentration of acid, Ca = Molar mass of acid / Ma = 98/0.05=1960g/mol

Explanation: To calculate concentration of quinine, Cb is as follow

Va*Ca=Vb*Cb

∴ Cb=Va*Ca/Vb = 250*1960/20 = 24500g/mol