A natural sample contains 2.2 mg L" dissolved organic matter (DOM). The OM consists of many macromolecular species with average composition...
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 1 summarizes the composition of seawater and lake water samples. -

Calculate and compare the ionic

strength of these samples.

- What would be the ionic strength of the two waters if only singly charged species were considered?

How does this change if the divalent ions are included?

Comment on the contribution of the multiply charges ion to the total ionic strength of a natural water.

屏幕快照 2019-10-02 下午1.02.23.png

屏幕快照 2019-10-02 下午1.02.23.png

A natural sample contains 2.2 mg L" dissolved organic matter (DOM). The OM consists of
many macromolecular species with average composition C38H43025 N2S. Recalculate the
concentration as mol L' and ppm C (or mg C L-!).
Question 3: Ionic strength of a solution! (50 %)
Table 1 summarizes the composition of seawater and lake water samples.
Calculate and compare the ionic strength of these samples.
What would be the ionic strength of the two waters if only singly charged species were
considered? How does this change if the divalent ions are included? Comment on the .
contribution of the multiply charges ion to the total ionic strength of a natural water.
Table 1: Composition of seawater and lake water samples.
Ion Seawater (mol kg-]) Lake water (mmol kg-])
Nat
0.49
0.2
Mo2+
0.53
0.14
Ca2+
0.01
0.22
K
0.01
0.03
CI-
0.57
0.09
SO 2
0.028
0.102
HCO3
0.002
0.816
END

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