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Ch. 4 - Acids and Bases/Electron Flow
Mullins - Organic Chemistry: A Learner Centered Approach 1st Edition
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Mullins 1st EditionCh. 4 - Acids and Bases/Electron Flow문제 28
3장, 문제 28

Given the following Keq values, how much stronger of an acid is methanol (CH3OH) than acetylene (HC≡CH)?
Chemical equations comparing the acid strength of methanol and acetylene, with equilibrium constants displayed.

검증된 단계별 안내
1
Identify the equilibrium constant (K_eq) values for methanol (CH₃OH) and acetylene (HC≡CH). These values are typically related to the acid dissociation constants (K_a) of the acids.
Recall that the strength of an acid is directly proportional to its K_a value. A higher K_a indicates a stronger acid.
To compare the acid strengths, calculate the ratio of the K_a values of methanol to acetylene. This can be expressed as: Ka(CH3)OH)/Ka(HC≡CH)
Take the logarithm (base 10) of the ratio to express the difference in acid strength in terms of pKa values. Recall that pKa=-log(Ka).
Interpret the result: A difference of 1 in pKa corresponds to a 10-fold difference in acid strength. Use this relationship to determine how much stronger methanol is as an acid compared to acetylene.

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1m

주요 개념

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

Acid-Base Strength

Acid-base strength is determined by the ability of an acid to donate protons (H⁺) in a solution. Stronger acids have a greater tendency to dissociate and release protons, leading to higher concentrations of H⁺ ions. The strength of an acid can be quantitatively expressed using the acid dissociation constant (K_a), where a larger K_a indicates a stronger acid.
추천 영상:
가이드 코스
2:50
Acid-Base Catalysis Concept 3

Equilibrium Constant (K_eq)

The equilibrium constant (K_eq) is a numerical value that expresses the ratio of the concentrations of products to reactants at equilibrium for a given reaction. In acid-base reactions, K_eq can be used to compare the strengths of different acids. A higher K_eq value for an acid indicates that it is more likely to donate protons compared to another acid, thus being stronger.
추천 영상:
02:19
The relationship between equilibrium constant and pKa.

Comparative Acid Strength

To compare the strength of two acids, one can use the relationship between their K_a values or K_eq values. The difference in their K_eq values can be used to calculate how many times stronger one acid is compared to another. This comparison is essential in organic chemistry to predict the behavior of acids in various chemical reactions and their reactivity.
추천 영상:
02:41
Comparing hydrocarbon acidity
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