Regardless of the natural water, the main salts dissociate into the following ions in solution.
Cation: Ca'-'Na+, K+.
Anions: HCU3, CCY3, cl-, S 2-04.
The content of these eight main ions accounts for 95% to 99% of the total amount of dissolved substances in the aqueous solution. The eight major ions are combined with each other, and the arrangement of the imaginary combinations is a^-f.
As shown in Figure 1-2.
Because +, M dream ten is the most easy to combine with HCO3; secondly, it is combined with S 204 to form a precipitate, and Na, K+ and Cl combine to form NaCl which is dissolved in ''one'. The amount of B represents Ca(HC03) z 1 b--c represents Ca(HC03 ) 2 , cd represents MgS04, and the rest is Naz S04., NaCl salt.
The dissolution of salts and alkalis in water is as follows:
1) Potassium, sodium and strontium compounds are soluble in water
2) Nitrate can be dissolved in water.
3) Chloride is soluble in water except for silver, mercury, and lead (slightly soluble).
4) Sulfate is soluble in water except for bismuth, lead and calcium (slightly soluble).
5) Carbonate is insoluble in water except potassium, sodium and money.
6) Oxides and hydroxides are insoluble in water except potassium, sodium, rubidium and cesium; calcium hydroxide is slightly soluble in water.
7) Colloidal substances such as iron, aluminum, silicon oxides and hydroxides can be dissolved in water, the solubility is related to the pH value of water, and the classification of impurities in water is shown in Table 1-
Suspended particles in aqueous solutions are generally observed directly, and colloidal materials are observed under high power microscopes. The three solution states that are actually present in natural water are generally present at the same time.
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