Question

exam lesson name: introduction to oceanography
exam number: 700793rr
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question 20 of 20 :
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1. as the major constituent in seawater, the measure of ______ ions present is typically used to determine the concentration of other conservative eleme

○ a. calcium
○ b. sodium
○ c. magnesium
○ d. chloride

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Explanation:

In seawater, chloride ions ($\text{Cl}^-$) are the major conservative constituent. The concentration of chloride is used as a reference to determine the concentrations of other conservative elements because of its high abundance and relatively constant ratio to other major ions in seawater. Sodium, calcium, and magnesium are also present, but chloride is the key ion for this purpose.

Answer:

D. chloride