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Chapter 27: Q16P (page 767)

A method to measure soluble organic carbon in seawater includes oxidation of the organic materials to CO2 with K2S2O8, followed by gravimetric determination of the CO2 trapped by a column 0f Ascarite. A water sample weighing 6.234 g produced 2.378 mg of CO2(FM 44.009). Calculate the ppm carbon in the seawater.

Short Answer

Expert verified

the ppm carbon in the seawater is 104.1.

Step by step solution

01

Calculate the moles of CO2:

In this task we have a water sample of 6.234 g which produced 2.378 mg of CO2(M=44.009 g/mol). Here we will calculate the ppm of carbon in the seawater.

Calculating the moles of CO2:

n(CO2)=mMn(CO2)=2.378mg44.010g/moln(CO2)=5.4033脳10-5mol

Consider that n(CO2)=n(C).

02

Calculate the mass and ppm of Carbon (C):

Mass of carbon (C) is,

m(C)=n脳Mm(C)=(5.4033脳10-5)mol)脳12.01g/molm(C)=6.49脳10-4g

Ppm of carbon in the seawater is,

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