1. Three solutions have the following pH values: solution (a), pH 6.0; solution

Question

1. Three solutions have the following pH values: solution (a), pH 6.0; solution (b), pH 1.8; solution (c), pH 7.9. Which solution contains the highest H3O+ ion concentration? 2. The presence of the carbonate ion, CO3 2-, in water produces a basic solution. Write an equation showing how it generates hydroxide ion. 3. Which best characterizes the approximate internal pH of most mammalian cells: (a) high concentration of H3O+; (b) nearly equal concentrations of H3O+ and OH-; or (c) high concentration of OH-?

Explanation / Answer

1. remember that the stronger the acid, the greater its H3O+ concentration. Since strong acids have pH nearer to 1, then we expect a pH nearer to 1 to be the stronger one. thus, the answer is B. 2. CO3^2- + H2O ---------------- HCO3- + OH- 3. since mammalian cells are almost neutral (pH = 7), then the concentration of H+ and OH- ions must nearly be equal. If either of these is more concentrated, then the cells would ba acidic or basic. so, the answer is B...

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