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Ch.17 - Acids and Bases
Tro - Chemistry: A Molecular Approach 6th Edition
Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Tro 6th EditionCh.17 - Acids and Bases문제 61a
17장, 문제 61a

For each strong acid solution, determine [H3O+], [OH–], and pH. a. 0.25 M HCl

검증된 단계별 안내
1
Step 1: Recognize that HCl is a strong acid, which means it completely dissociates in water. Therefore, the concentration of hydronium ions, [H3O+], is equal to the initial concentration of HCl, which is 0.25 M.
Step 2: Use the relationship between [H3O+] and [OH-] given by the water dissociation constant, Kw = 1.0 x 10-14 at 25°C. The formula is [H3O+] x [OH-] = Kw. Substitute [H3O+] = 0.25 M into the equation to solve for [OH-].
Step 3: Calculate the pH of the solution using the formula pH = -log[H3O+]. Substitute [H3O+] = 0.25 M into the equation to find the pH.
Step 4: Verify your calculations by checking that the product of [H3O+] and [OH-] equals 1.0 x 10-14, ensuring that the calculations are consistent with the properties of water at 25°C.
Step 5: Summarize the results: [H3O+] = 0.25 M, [OH-] calculated from Kw, and pH calculated from the pH formula.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Strong Acids

Strong acids, such as hydrochloric acid (HCl), completely dissociate in water, meaning that all the acid molecules break apart into their constituent ions. For a 0.25 M HCl solution, this results in a hydronium ion concentration, [H3O+], of 0.25 M, as each HCl molecule produces one H3O+ ion.
추천 영상:
가이드 코스
01:09
Strong Acid-Strong Base Titration

pH Calculation

The pH of a solution is a measure of its acidity, calculated using the formula pH = -log[H3O+]. For the 0.25 M HCl solution, the pH can be determined by substituting the [H3O+] value into the formula, yielding a pH of approximately 0.60, indicating a highly acidic solution.
추천 영상:
가이드 코스
02:15
pH Calculation Example

Water Ion Product

In pure water at 25°C, the product of the concentrations of hydronium ions and hydroxide ions is constant, known as the water ion product (Kw = [H3O+][OH-] = 1.0 x 10^-14). To find the hydroxide ion concentration, [OH-], in a strong acid solution, use the relationship [OH-] = Kw / [H3O+]. For the 0.25 M HCl solution, this results in [OH-] being approximately 4.0 x 10^-14 M.
추천 영상:
가이드 코스
00:53
Production of Hydrogen Example
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