Lecture 3 13) A. plH is the measure of B. A solhtion with a plH less than 7 is C
ID: 716032 • Letter: L
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Lecture 3 13) A. plH is the measure of B. A solhtion with a plH less than 7 is C A solution with a pH greater than 7 is D. A solution with a pli equal to 7 is E. Lemons and stomach acid are ions on a logarithmic scale while is basic 14) A whereas a sohotion has moee bydrogen (or hydronium) ions than hydroxide ions, solhution has equal aumbers of hydroside ions than hydrogen ions. (acidic, solution has more hydroxide ions than hydrogen ions A neutral or basic) 15) A. If the concenirnation of by drogen ions is 10* M, the plt is B. What is the concentrations of hdeogen ions in a solution with a pH of 4? C. trte concentration of bedrum ios is 104 M, the pH is. D What is the concentration of bydleagen ions in a solution with a pH of 9? E. Ifthe concentration of ho druside ioss is 10 M, the pli is 16) A. Why is pef important in cells? B. What do buffers do?Explanation / Answer
13)
A. pH = -log[H+]
B. pH less than 7, solution is acidic
C. pH greater than 7, solution is basic
D. B. pH equal to 7, solution is neutral
E. Lemon and stomach acids are acidic, while baking soda is basic.
14) A acidic solution has more hydrogen ions than hydroxide ions, whereas, a basic solution has more hydroxide ions than hydrogen ions. A neutral solution has equal hydrogen and hydroxide ions.
15)
A. If hydrogen ion is 10^-4 M, pH is 4 (acidic)
B. concentration of hydrogen ion = 10^-4 M
C. If concentration of Hydrogen ion is 10^-9 M, pH = 9 (basic)
D. with pH 9, hydrogen ion concentration = 10^-9 M
If hydroxide ion is 10^-4 M, the pH is 10. (basic)
16)
A. pH is important in cells, as transport of ions at different pH is different which ultimately affected the growth of plants.
B. Buffers keep the pH of the solution unchanged by neutralizing the added acid or base to the solution.
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