12. In an open system for water, where carbon dioxide is present in the atmosphe

Question

12. In an open system for water, where carbon dioxide is present in the atmosphere as a source of carbonate, how would you expect the carbonate concentrations in solution to change as pH increases? carbonate species A. Ex B. Expect a decreasing concentration of carbonate with increasing pH as species are converted C. Expect to reach a plateau in the concentration of carbonate at high pH D. Expect that as ph increases, carbonate species will increase 13. How are organic compounds different from inorganic compounds? A. Combustible, soluble and quick reactions with organics B High molecu C. One structure per formula, slow reactions rates, low meling points with organics D. Form molecules, not combustible, less soluble in water with organics E. Less soluble in water,high molecular weights, combustible for organics solubility for organics When you add enough chlorine to the reactor so that all the chlorine that will react does, and the remaining 14. is free residual, you are overcoming the chlorine amount A. dissociation B. speciation breakpoint effectiveness

Explanation / Answer

Ans 12 : B) Expect a decreasing concentration of carbonate with increasing pH as species are converted.

When carbon dioxide mixes in water , it forms carbonic acid. The acid dissociates giving protons and carbonate ions , which decreases the pH of water.

So with decreasing pH , the concentration of carbonate species will increase in water and vice versa.

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