Concept explainers
Interpretation:
The correct
Concept introduction:
pKa: It is introduced as an index to express the acidity of weak acids, where
In aqueous solution an acid undergoes ionization. The ionization of an acid is can be expressed in terms of equilibrium constant. The quantitative measurement tells about the strength of the acid. Higher the value of
The dissociation constant for the acid is
For simplifications
The lower value of
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Chemistry & Chemical Reactivity
- The acid HA has pKa 7.00. (a) Which is the principal species, HA or A, at pH 6.00? (b) Which is the principal species at pH 8.00? (c) What is the quotient [A]/[HA] at (i) pH 7.00; (ii) at pH 6.00?arrow_forward6. For the ionization of phenylacetic acid, C6H5CH₂CO₂H + H₂O = H3O+ + C6H5CH₂CO₂ K₂ = 49 × 10-5 (a) What is [C6H5CH₂CO₂] in 0.186 M C6H3CH₂CO₂H? (b) What is the pH of 0.121 M C6H3CH₂CO₂H?arrow_forwardChoose the stronger acid in each of the following pairs:(a) H₂Se or H₃As (b) B(OH)₃ or Al(OH)₃(c) HBrO₂ or HBrOarrow_forward
- Which is the conjugate base in each of the pairs below?arrow_forwardBenozic acid (C6H5COOH) has a pKa of 4.20. What is the ratio of the acid to its conjugate acid at a pH of 2.20 and what is the formula of the conjugate acid?arrow_forwardCalculate the equilibrium constant for the acid–base reaction between the reactants in each of the following pairs: (a) HCl + H2O (b) CH3COOH + H2O (c) CH3NH2 + H2O (d) CH3N+H3 + H2Oarrow_forward
- Hydroxide (-OH) can react as a Brønsted–Lowry base (and remove a proton), or a Lewis base (and attack a carbon atom). (a) What organic product is formed when -OH reacts with the carbocation (CH3)3C+ as a Brønsted–Lowry base? (b) What organic product is formed when -OH reacts with (CH3)3C+ as a Lewis base?arrow_forwardThe following reactions all have K > 1.1) HF (aq) + C6H5O- (aq) F- (aq) + C6H5OH (aq)2) CH3COOH (aq) + C6H5O- (aq) C6H5OH (aq) + CH3COO- (aq)3) HF (aq) + CH3COO- (aq) F- (aq) + CH3COOH (aq)Arrange the substances based on their relative acid strength. Strongest acid, intermediate acid, weak acid, not a Bronsted-Lowry acid. CH3COOH HF C6H5OH CH3COO- F- C6H5O-arrow_forwardAlcohols are weak organic acids, pKa 15–18. The pKa of ethanol, CH3CH2OH, is 15.9. Write equations for the equilibrium reactions of ethanol with each base. Which equilibria lie considerably toward the right? Which lie considerably toward the left? Q.) NaNH2arrow_forward
- 4. Acid A has a pKa value of 5.71, and acid B has a pKa value of 5.30. Which of the two acids is the weaker?arrow_forward5). Which of the following compound has lowest pKa? H3C (A) COOH F (B) COOH 6). What is the product nhtained from the full COOH (C) COOH (D) COOH (E)arrow_forwardWhat is the K a of an acid whose pK a is 8.60?arrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning