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A Buffer Solution Contains Carbonic Acid (H2CO3) and Sodium Bicarbonate

Question 41

Multiple Choice

A buffer solution contains carbonic acid (H2CO3) and sodium bicarbonate (NaHCO3) , each at a concentration of 0.100 M.The relevant equilibrium is shown below.What is the pH of this buffer solution? H2CO3(aq) + H2O(l) A buffer solution contains carbonic acid (H<sub>2</sub>CO<sub>3</sub>) and sodium bicarbonate (NaHCO<sub>3</sub>) , each at a concentration of 0.100 M.The relevant equilibrium is shown below.What is the pH of this buffer solution? H<sub>2</sub>CO<sub>3</sub>(aq) + H<sub>2</sub>O(l) H<sub>3</sub>O<sup>+</sup>(aq) + HCO<sub>3</sub>−(aq) K<sub>a</sub> = 4.5 × 10<sup>−7</sup> A) 4.50 B) 7.00 C) 6.35 D) 7.65 E) 2.16 H3O+(aq) + HCO3−(aq) Ka = 4.5 × 10−7


A) 4.50
B) 7.00
C) 6.35
D) 7.65
E) 2.16

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