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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 8
17장, 문제 8

A 0.085 M solution of a monoprotic acid has a percent ionization of 0.59%. Determine the acid ionization constant (Ka) for the acid.

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insert step 1> Calculate the concentration of ionized acid using the percent ionization formula: \( \text{Percent Ionization} = \left( \frac{[\text{H}^+]}{[\text{HA}]} \right) \times 100 \). Here, [HA] is the initial concentration of the acid, and [H+] is the concentration of ionized acid.
insert step 2> Rearrange the formula to solve for [H+]: \( [\text{H}^+] = \frac{\text{Percent Ionization} \times [\text{HA}]}{100} \).
insert step 3> Substitute the given values into the equation: \( [\text{H}^+] = \frac{0.59 \times 0.085}{100} \).
insert step 4> Write the expression for the acid ionization constant \( K_a \) for a monoprotic acid: \( K_a = \frac{[\text{H}^+][\text{A}^-]}{[\text{HA}]} \). Since the acid is monoprotic, [H+] = [A-].
insert step 5> Substitute the values into the \( K_a \) expression: \( K_a = \frac{([\text{H}^+])^2}{[\text{HA}] - [\text{H}^+]} \). Use the calculated [H+] and initial [HA] to find \( K_a \).

주요 개념

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

Monoprotic Acid

A monoprotic acid is an acid that can donate only one proton (H+) per molecule during the ionization process. This characteristic simplifies the calculation of its ionization in solution, as it only involves the dissociation of a single hydrogen ion. Common examples include acetic acid and hydrochloric acid.
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가이드 코스
01:03
Binary Acids

Percent Ionization

Percent ionization is a measure of the extent to which an acid dissociates in solution, expressed as a percentage. It is calculated by dividing the concentration of ionized acid by the initial concentration of the acid, then multiplying by 100. This concept helps in understanding the strength of the acid; a higher percent ionization indicates a stronger acid.
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가이드 코스
06:08
Percent Ionization Example

Acid Ionization Constant (Ka)

The acid ionization constant (Ka) quantifies the strength of an acid in solution, representing the equilibrium constant for the dissociation of the acid into its ions. It is calculated using the concentrations of the products and reactants at equilibrium. A larger Ka value indicates a stronger acid, as it implies a greater degree of ionization.
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가이드 코스
03:50
Characteristics of Ka and Kb
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교과서 질문

Identify each substance as an acid or a base and write a chemical equation showing how it is an acid or a base according to the Arrhenius definition. a. HNO3(aq) b. NH4+(aq) d. HC2H3O2(aq)

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