. Calculate the abundances of minerals that reacted with water from the Tsurukab
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Question
. Calculate the abundances of minerals that reacted with water from the Tsurukabato area of Japan to give it the following chemical composition: Na+ = 7.2 mg/L, K+ = 0.77 mg/L, Ca2+ = 13.2 mg/L, Mg2+ = 0.79 mg/L, Si02 = 15.5 mg/L, Cl- = 6.5 mg/L, SO42- = 10.4 mg/L, HCO3- = 33.6 mg/L. Use an appropriate analysis of rainwater from Table 20.2. What kinds of rocks interacted with this water?
376 CHEMICAL COMPOSITION OF SURFACE WATER Table 20.2 Chemical Composition of Meteoric Precipitation (in mg/I) Region United States 0.584.83 2.45 Coastal Inland 3.68 0.24 0.40 0.20 0.10 1.4 0.41 3.0 1.20 0.30 Europe Coastal Inland 11.4 0.60 151 1.09 20.1 635 1.80 0.45 0.64 0.20 0.22 0.78 1.27 3.02 1.42 0.28 1.4 0.6 0.6 1.6?4.9 0.6 0.7 5.6 U.S.SR. Austrailia 4.43 trace 1.1 0.26 0.36 0.971.2 4.5 2.46 0.37 0.50 1.2 southeast Japan Oceans and islands of the world 5.79 031 0.47 0.89, 110 2.44 0.210.075 5.0 World Average, coastal (Explanation / Answer
As the water sample shown must be saline water because it contains high concentration of carbonic acid content.
The rich minerals of rock salt i.e Na+ and Cl- shows that these are weathering from rocks due to reaction with complex salt like Ca+2 and Mg+2.
It has high concentration of sulfate ion shows that this area may suffer from some natural disaster like volcanic eruption that leads to atmospheric precipitation of sulfur on rock.Silica and magnesium is normal in sample.
This all give the estimation of rock that is rich in calcium ions and carbonate ion which enrich the amount of carbonic acid in water. So this rock must be limestone rocks which react with given sample of water.
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