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8.28) The general form of a chemical equation for an acid reacting with water to produce its base form and hydronium can be written as: HA (aq) H₂O (1) A (aq) + H3O+ (aq) Conjugate Pair HA represents the acid form, and A- represents the base form of any conjugate pair. When the pH of a solution is less than the pK, of an acid, then the concentration of the acid form, [HA], is greater than the concentration of the base form, [A-]. ▪ In this case, we say that the acid form is predominant. 1 ● . When the pH of a solution is greater than the pK, of an acid, then the concentration of the base form, [A], is greater than the concentration of the acid form, [HA]. In this case, we say that the base form is predominant. ■ When the pH of a solution is equal to the pK, of an acid, then the concentration of the acid form, [HA], is equal to the concentration of the base form, [A-]. QUESTION: When hydrocyanic acid (HCN) is placed in water, a chemical reaction occurs and an equilibrium is established as shown below. The pK, of HCN is 9.31. Predict whether the acid form (HCN) or the base form (CN) is predominant at pH = 7.4. CN- (aq) + H₂O+ (aq) HCN (aq) + H₂O (1) acid form of Hew is predominant, PH (7.4) is less than the pka (9.31), therefore concentration of the acid form, AHCM] is greater than the concentration of the base form, EN-] of 11

8.28) The general form of a chemical equation for an acid reacting with water to produce its base form and hydronium can be written as: HA (aq) H₂O (1) A (aq) + H3O+ (aq) Conjugate Pair HA represents the acid form, and A- represents the base form of any conjugate pair. When the pH of a solution is less than the pK, of an acid, then the concentration of the acid form, [HA], is greater than the concentration of the base form, [A-]. ▪ In this case, we say that the acid form is predominant. 1 ● . When the pH of a solution is greater than the pK, of an acid, then the concentration of the base form, [A], is greater than the concentration of the acid form, [HA]. In this case, we say that the base form is predominant. ■ When the pH of a solution is equal to the pK, of an acid, then the concentration of the acid form, [HA], is equal to the concentration of the base form, [A-]. QUESTION: When hydrocyanic acid (HCN) is placed in water, a chemical reaction occurs and an equilibrium is established as shown below. The pK, of HCN is 9.31. Predict whether the acid form (HCN) or the base form (CN) is predominant at pH = 7.4. CN- (aq) + H₂O+ (aq) HCN (aq) + H₂O (1) acid form of Hew is predominant, PH (7.4) is less than the pka (9.31), therefore concentration of the acid form, AHCM] is greater than the concentration of the base form, EN-] of 11

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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8.28) The general form of a chemical equation for an acid reacting with water to produce its base form and hydronium can be written as: HA (aq) + H₂O (1) A (aq) + H₂O+ (aq) Conjugate Pair HA represents the acid form, and A represents the base form of any conjugate pair. When the pH of a solution is less than the pK, of an acid, then the concentration of the acid form, [HA], is greater than the concentration of the base form, [A-]. In this case, we say that the acid form is predominant. When the pH of a solution is greater than the pK, of an acid, then the concentration of the base form, [A], is greater than the concentration of the acid form, [HA]. In this case, we say that the base form is predominant. When the pH of a solution is equal to the pK, of an acid, then the concentration of the acid form, [HA], is equal to the concentration of the base form, [A-]. QUESTION: When hydrocyanic acid (HCN) is placed in water, a chemical reaction occurs and an equilibrium is established as shown below. The pK, of HCN is 9.31. Predict whether the acid form (HCN) or the base form (CN) is predominant at pH = 7.4. CN- (aq) + H3O+ (aq) HCN (aq) + H₂O (1) acid form of Hewis predominant, PH (7.4) is less than the pka (9.31), therefore concentration of the acid form, ACM] is greater than the concentration of the base form, EN-]
Transcribed Image Text:8.28) The general form of a chemical equation for an acid reacting with water to produce its base form and hydronium can be written as: HA (aq) + H₂O (1) A (aq) + H₂O+ (aq) Conjugate Pair HA represents the acid form, and A represents the base form of any conjugate pair. When the pH of a solution is less than the pK, of an acid, then the concentration of the acid form, [HA], is greater than the concentration of the base form, [A-]. In this case, we say that the acid form is predominant. When the pH of a solution is greater than the pK, of an acid, then the concentration of the base form, [A], is greater than the concentration of the acid form, [HA]. In this case, we say that the base form is predominant. When the pH of a solution is equal to the pK, of an acid, then the concentration of the acid form, [HA], is equal to the concentration of the base form, [A-]. QUESTION: When hydrocyanic acid (HCN) is placed in water, a chemical reaction occurs and an equilibrium is established as shown below. The pK, of HCN is 9.31. Predict whether the acid form (HCN) or the base form (CN) is predominant at pH = 7.4. CN- (aq) + H3O+ (aq) HCN (aq) + H₂O (1) acid form of Hewis predominant, PH (7.4) is less than the pka (9.31), therefore concentration of the acid form, ACM] is greater than the concentration of the base form, EN-]
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