Which of the following is/are present in a reagent bottle labeled 1.0 M H2SO4?
I. H2SO4
II. HSO4-
III. SO4-2
A. I only
B. I and II
C. II and III
D. I, II, and III
apparently the answer is C, yet i cannot find any explanation to it...
A reagent bottle labeled as 1.0 M H2SO4 contains the compound H2SO4. Therefore, the correct answer is:
A. I only
To answer this question, we need to know the chemical formula and the dissociation properties of sulfuric acid (H2SO4).
In sulfuric acid (H2SO4), there are two hydrogen atoms (H) and one sulfur atom (S), and four oxygen atoms (O). Let's break down the dissociation of sulfuric acid:
H2SO4 ⇌ H+ + HSO4-
In the given reagent bottle labeled 1.0 M H2SO4, the concentration is stated as 1.0 M, which means it contains 1.0 mole of sulfuric acid per liter of solution.
Based on the dissociation, we can determine the presence of each species in the reagent bottle:
I. H2SO4: This is the undissociated form of sulfuric acid and is present in the reagent bottle, so statement I is true.
II. HSO4-: This is the hydrogen sulfate ion formed after the first proton (H+) is removed from sulfuric acid. Since H2SO4 can dissociate into H+ and HSO4-, the presence of hydrogen sulfate ion is also in the reagent bottle, so statement II is true.
III. SO4-2: This is the sulfate ion formed after the second proton (H+) is removed from sulfuric acid. As mentioned above, sulfuric acid only dissociates into H+ and HSO4-, not into sulfate ions. Therefore, statement III is not true.
Based on the explanations above, the correct answer is A. I only.