Which of the following represents the most acidic solution?

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BlackTom AI · Accepted Answer

Question restatement: Which of the following represents the most acidic solution?

Option 1: pOH = 14.7
- This implies pH = 14 − 14.7 = −0.7. A negative pH corresponds to a very high hydrogen ion concentration, roughly [H+] ≈ 10^0.7 ≈ 5 M. That is an extremely acidic solution, more so than the other options. This makes it a strong contender for the most acidic.

Option 2: [H3O+] = 1.0 M
- An hydronium concentration of 1 M corresponds to pH = 0. This is strongly acidic, but we should compare it to the other options. On the surface, 1 M H3O+ is highly acidic, but not necessarily the highest if another option implies a pH below 0.

Option 3: [OH−] = 1.0 × 10−14 M
- If [OH−] = 1×10−14 M, then using Kw ≈ 1.0×10−14 at 25°C, [H3O+] ≈ Kw / [OH−] = (1.0×10−14) / (1.0×10−14) = 1 M. This leads to pH = 0, matching Option 2 in terms of acidity. So this option does not exceed the acidity implied by 1.0 M H3O+; it is essentially equally acidic to Option 2.

Option 4: pH = 3.6
- A pH of 3.6 corresponds to [H3O+] ≈ 10^−3.6 ≈ 2.5×10^−4 M. This is clearly less acidic than the 1 M scenarios and far less acidic than any situation with pH near 0 or negative. It is among the least acidic options here.

Putting this together, we compare acidity by hydrogen ion concentration (or equivalently, pH). The pOH 14.7 case yields pH = −0.7, which corresponds to a higher [H3O+] (~5 M) than the 1.0 M case, and thus represents the most acidic scenario among the options provided.

Summary of correctness assessment:
- Option 1 (pOH = 14.7) implies a negative pH and a very large [H3O+], making it the most acidic among the choices.
- Option 2 ([H3O+] = 1.0 M) is very acidic (pH 0) but not as acidic as the pH of −0.7 implied by Option 1.
- Option 3 ([OH−] = 1.0 × 10−14 M) leads to [H3O+] ≈ 1 M, same acidity level as Option 2, not exceeding it.
- Option 4 (pH = 3.6) is the least acidic by comparison, given its relatively tiny [H3O+].

CHM-1020-LD01.2025SU Quiz 4-Acids and bases

Which of the following represents the most acidic solution?

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CHM-1020-LD01.2025SU Quiz 4-Acids and bases

Which of the following represents the most acidic solution?

View Explanation

Log in for full answers

Similar Questions

if a solution has a proton concentration of 10-11 M, what is the hydroxide ion concentration? Please choose the correct answer from the following choices, and then select the submit answer button.

What is true about an acidic solution at 25°C?

What is the pH of a solution when [OH−] = 3.8 × 10−5. Is this solution acidic or basic?

Match the correct response When the pH of a solution rises what happens to the followings 1: [H3O+] [H3O+] 2: pOH 3: [OH-] [OH-] 4: [H3O+]x [OH-] [H3O+] x [OH-]

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More Practical Tools for International Students

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