2. Marine Chemistry
Major Ions — Quiz
Test your understanding of major ions with 5 practice questions.
Practice Questions
Question 1
Which major seawater ion has the longest residence time, making it the most conservative tracer of ocean mixing?
Question 2
Which major ion forms the neutral complex MgSO₄⁰ in seawater, affecting magnesium’s activity coefficient?
Question 3
If seawater contains [Na⁺]=0.468 M and [Cl⁻]=0.545 M, what is the approximate ionic strength $I$? Show calculation.
Question 4
Why can total salinity in open-ocean samples be accurately estimated from chloride concentration alone?
Question 5
Given a salinity of 35 g/kg and sodium’s mass fraction of 30.6 %, what is the sodium concentration in g/kg? Show calculation.