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 pKb for the propanoate ion, CH3CH2CO3 , is 9.126. What is the value of Ka (NOT the pKa) for propanoic acid, CH3CH2CO3H?arrow_forward(b) Calculate the pH of 0.0005 mol dm-3 ethanois acid when its pKa = 4.75 CH;COOH() -> CH;COO (a H(a + Ka = pH =arrow_forwardThe base B has pKb 5.00. (a) What is the value of pKa for the acid BH? (b) At what pH is [BH] [B]? (c) Which is the principal species, B or BH, at pH 7.00? (d) What is the quotient [B]/[BH] at pH 12.00?arrow_forward
- For an acid with a pKa of 5.00, what is the pKb of its conjugate base?arrow_forwardThe 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_forwardAmmonia (NH3) is a weak base that under acidic conditions becomes protonated to the ammonium ion in thefollowing reaction:NH3 + H+ → NH4 +NH3 freely permeates biological membranes, including thoseof lysosomes. The lysosome is a subcellular organelle witha pH of about 4.5–5.0; the pH of cytoplasm is about 7.0.What is the effect on the pH of the fluid content of lysosomes when cells are exposed to ammonia? Note: Ammonium (NH4 +) does not diffuse freely across membranes.arrow_forward
- (a) What is the K(b) of the benzoate ion, C₆H₅COO?(b) What is the Kₐ of the 2-hydroxyethylammonium ion,HOCH₂CH₂NH₃⁺(pK(b) of HOCH₂CH₂NH₂=4.49)?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_forwardWhich is the conjugate base in each of the pairs below?arrow_forward
- 5) Identify which of the following reactions are unfavorable and explain why: A) :o: B) C) + cig CHzö. D)arrow_forward3. Which is the stronger acid: (a) Benzoic acid with a Ka of 6.5 x10-5 or hydrocyanic acid with a Ka of 4.9 x 10-10? (b) Boric acid with a pKa of 9.14 or carbonic acid with a pKa of 6.37arrow_forward5. (a) HF is an acid. What is it's conjugate base ? (b) CIO₂ is a base. What is it's conjugate acid ? (c) What is the conjugate base of H₂PO4¹ ? (d) What is the conjugate acid of H₂PO4-¹ ?arrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning