As the pH of a solution rises, [H3O+] _____, pOH _____, and [OH−] _____.

Question

BlackTom AI · Accepted Answer

Let's lay out the relationships involved when pH changes. pH is a measure of [H3O+], specifically pH = -log[H3O+]. As pH increases (more basic), [H3O+] decreases. The pOH is defined as pOH = -log[OH−], and [OH−] increases when the solution becomes more basic. Consequently, pOH increases as pH increases, and [OH−] rises.

Option 1: "rises; falls; falls". Interpreting this in order, it claims [H3O+] rises with increasing pH, which is incorrect because [H3O+] actually falls as the solution becomes more basic. The second part, pOH would fall according to this option, contradicting the known relationship where pOH increases with higher pH. The third part, [OH−] would fall, which again contradicts the expectation that hydroxide concentration increases with basicity. Overall, this option misaligns all three trends.

Option 2: "falls, falls, falls". This option asserts [H3O+] falls (correct direction), but then says pOH falls (incorrect, pOH should rise as pH increases). Finally, it says [OH−] falls (incorrect, [OH−] should rise). Because two of the three terms are incorrect, this option is not a valid description of the scenario.

Option 3: "falls; rises; falls". Here, [H3O+] falling is correct, since increasing pH reduces hydronium. However, the second claim is that pOH rises (correct) but the third claim is that [OH−] falls (incorrect, [OH−] should rise with increased pH). The mismatch in the third part makes this option inaccurate overall.

Option 4: "falls; falls; rises". In this case, [H3O+] falls (correct), but pOH is stated as falling (incorrect, pOH should rise as basicity increases). The final part says [OH−] rises (correct), yet because the middle clause is wrong, the overall statement is not consistent with the expected trends.

Option 5: "rises; falls; rises". This option begins with [H3O+] rising (incorrect, it should fall). It also asserts pOH falls (incorrect, it should rise), and [OH−] rises (that part is correct, but the first two are not). Because multiple components are incorrect, this option fails to describe the situation.

In summary, each option contains at least one mismatch with the correct chemical reasoning: the core correct pattern is [H3O+] falls, pOH rises, and [OH−] rises when pH increases. None of the provided options perfectly matches all three relationships, though some capture two of the three correctly and misstate the third. The overarching concept to memorize is the inverse relationship between [H3O+] and pH, the direct relationship between pOH and pH, and the corresponding rise in [OH−] with increasing pH.

CHM-1020-LD01.2025SU PS II- Part I (Acids and Bases)

As the pH of a solution rises, [H3O+] ___, pOH _, and [OH−] ___.

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CHM-1020-LD01.2025SU PS II- Part I (Acids and Bases)

As the pH of a solution rises, [H3O+] _____, pOH _____, and [OH−] _____.

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-]

In a 1.2 M solution of KOH, a strong base, [H3O+] = _____, and [OH−] = _____.

A vinegar sample had a pH of 3.88. This corresponds to [OH-] =

Which of the following represents the most acidic solution?

In a 1.2 M solution of KOH, a strong base, [H3O+] = _____, and [OH−] = _____.

More Practical Tools for International Students

Homework AI Solver

Stylized Writing Assistant

Plagiarism Checker Assistant

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Past Exam Questions by School

Smart Practice Assistant

Adaptive Practice

Making Your Study Simpler

As the pH of a solution rises, [H3O+] ___, pOH _, and [OH−] ___.

In a 1.2 M solution of KOH, a strong base, [H3O+] = _, and [OH−] = _.

In a 1.2 M solution of KOH, a strong base, [H3O+] = _, and [OH−] = _.