What is the conjugate acid of HSO3? As a result of these reactions, a salt solution is either acidic or basic. Just how weak a base NO 3 – is can be demonstrated using the value of K a (HNO 3) = 20 mol L … Calculate the concentration of hydroxide ions in stomach acid at body temperature if [H+] = 0.10 M. Answer: [OH-] = 2.8 x 10-13 M In reality, all acid-base reactions involve the transfer of protons between acids and bases. What is the conjugate acid of ph3 a ph4 b ph2 c ph4 2. What is the conjugate base of HCO 3-? These relationships have been represented by, $$\mathrm{H^+ + {\color{Blue} Base} = {\color{Red} Conjugate\: acid\: of\: Base}^+}$$, $$\mathrm{{\color{Red} Acid} = H^+ + {\color{Blue} Conjugate\: base\: of\: Acid}^-}$$, $$\mathrm{{\color{Blue} NH_3} + H_2O \rightleftharpoons {\color{Red} NH_4^+} + OH^-}$$, $${\color{Red} \mathrm{HAc}} \rightleftharpoons \mathrm{H^+} + {\color{Blue} \mathrm{Ac^-}}$$. Let $$\ce{BH+}$$ be the conjugate acid of a base. The pH should be within 1 pH unit of the acid/conjugate base pKa. SURVEY . The Ka for $$\ce{HCO3-}$$ is 4.7E-11; what is the conjugate base and its Kb? H3O2 2. What is the conjugate base of HS-? PH4 2. Step 2. Chung (Peter) Chieh (Professor Emeritus, Chemistry @ University of Waterloo). What is the Ka for the oxalic acid $$\mathrm{(COOH)_2}$$? S-c. S 2-d. H 2 S. In this definition, an acid donates a proton while a base accepts the proton. Then the expression for the equilibrium constant for the reaction, $$\mathrm{A^- + H_2O \rightleftharpoons HA + OH^-}$$, $$\mathrm{\mathit K_b =\dfrac{[HA] [OH^-]}{[A^-]}}$$, Multiplying the numerator and denominator with $$\mathrm{[H^+]}$$ leads to, $$\mathrm{\mathit K_b =\dfrac{[HA] [OH^-]}{[A^-]}\dfrac{[H^+]}{[H^+]}}$$, \begin{align}\mathit K_{\mathrm b} &=\mathrm{\dfrac{[HA]}{[A^-] [H^+]}[OH^-] [H^+]}\\ &=\mathrm{\dfrac{[HA]}{[A^-] [H^+]}\mathit K_w}\\ &=\mathrm{\dfrac{\mathit K_w}{\mathit K_a}}\end{align}, $$\mathrm{\mathit K_a \mathit K_b = \mathit K_w}$$, and this formula is the same as the one derived for the conjugate acid of a base. The more stable/weaker the conjugate acid, the stronger the base. Kw is smaller at temperature less than 298 K. The concept of conjugate acid and base pairs is very useful for the consideration of acidity and basicity of salts. Course Hero is not sponsored or endorsed by any college or university. The conjugate base and conjugate acid for HS04 is: Conjugate acid is H2SO4 Conjugate base is SO42 PH3 or phosphine is acidic or not? After losing a proton, the acid species becomes the conjugate base. H2S 3. Can an acidic constant, Ka, be assigned to the conjugate acid of a base? check_circle Expert Answer. The more stable/weaker the conjugate base, the stronger the acid. Learning is a pleasure. 1. If Kb for the acetate ion is 5.6E-10, what is Ka for acetic acid? Spencer_CHE101_Week_2_Assignment_Part1_.docx, BAXTRON_TIFFANY_WEEK_2_ASSIGNMENT_CHEM_101.docx, week 2 assignment chem multiple choice.docx, Copyright © 2020. DIscussion The calculation regarding Ka and Kb conversion is simple, but understanding what problems require this type of conversion is difficult. Pages 6; Ratings 100% (6) 6 out of 6 people found this document helpful. H202 3. Answer: O. The concept is rather useful, and it further broadens the concept of acid and base. NH4+ is an acid and H3O+ is its conjugate base. What is the conjugate acid of PH3 A PH4 B PH2 C PH4 2 D PH2 12 What is the, 6 out of 6 people found this document helpful. Identifying Conjugate Acids and Bases (a) What is the conjugate base of HClO4, H2S, PH4+, HCO3- ? Treat the conjugate acid of a base as an acid in numerical calculations. PH42 4. To find the conjugate base of each substance remove one proton (H+) from the formula of the substance.Thus, the conjugate of the PH 4+ is the PH 3.