45. Acetic acid (CH3COOH) has a pKa of 4.76. What is the molar ratio of potassium acetate (CH3COOK) to acetic acid at pH 4.76? (A) 1:1 (B) 2:1 (C) 10:1 (D) 1:10

4. Which description is NOT correct? (A) A nucleic acid consists of four kinds of bases linked to a sugar–phosphate backbone. (B) A pair of nucleic acid strands with complementary sequences can form a double-helical structure. (C) DNA is a structurally rigid molecule that only exist in a specific helical form. (D) Double-stranded DNA can wrap around itself to form a supercoiled structure.

45. Acetic acid (CH₃COOH) has a pKa of 4.76. What is the molar ratio of potassium acetate (CH₃COOK) to acetic acid at pH 4.76?
(A) 1:1
(B) 2:1
(C) 10:1
(D) 1:10

相關試題

相關試卷