Interpretation:
The significant difference between the ionization constant values of
Concept introduction:
Hydrated
This attraction weakens the
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OWLv2 for Moore/Stanitski's Chemistry: The Molecular Science, 5th Edition, [Instant Access], 1 term (6 months)
- The hydrogen phthalate ion, C8HsO4, is a weak acid with Ka = 3.91 106. C8H5O4(aq)+H2O(l)C8H4O42(aq)+H3O+(aq) What is the pH of a 0.050 M solution of potassium hydrogen phthalate. KC8H5O4? Note: To find the pH for a solution of the anion, we must take into account that the ion is amphiprotic. It can be shown that, for most cases of amphiprotic ions, the H3O+ concentration is [H3O+]=Ka1Ka2 For phthalic acid, C8H6O4 is Ka1 is 1.12 103, and Ka2 is 3.91 106.arrow_forwardBoth ions in the salt ammonium acetate (NH4C2H3O2) hydrolyze in aqueous solution. Explain why this hydrolysis produces a neutral solution rather than an acidic or basic solution.arrow_forwardWeak base B has a pKb of 6.78 and weak acid HA has a pKa of 5.12. a Which is the stronger base, B or A? b Which is the stronger acid, HA or BH+? c Consider the following reaction: B(aq)+HA(aq)BH+(aq)+A(aq) Based on the information about the acid/base strengths for the species in this reaction, is this reaction favored to proceed more to the right or more to the left? Why? d An aqueous solution is made in which the concentration of weak base B is one half the concentration of its acidic salt, BHCl, where BH+ is the conjugate weak add of B. Calculate the pH of the solution. e An aqueous solution is made in which the concentration of weak acid HA twice the concentration of the sodium salt of the weak acid, NaA. Calculate the pH of the solution. f Assume the conjugate pairs B/BH+ and HA/A are capable of being used as color-based end point indicators in acidbase titrations, where B is the base form indicator and BH is the acid form indicator, and HA is the acid form indicator and A is the base form indicator. Select the indicator pair that would be best to use in each of the following titrations: (1) Titration of a strong acid with a strong base. (i) B/BH+ (ii) HA/A (2) Titration of a weak base with a strong acid. (i) B/BH+ (ii) HA/Aarrow_forward
- The text describes zinc hydroxide as an amphoteric hydroxide, so Zn(OH)2 is soluble in basic solution. What is the molar solubility of Zn(OH)2 in 1.00 M NaOH? What is the pH of the equilibrium solution?arrow_forwardAn important component of blood is the buffer combination of dihydrogen phosphate ion and the hydrogen phosphate ion. Consider blood with a pH of 7.44. a What is the ratio of [H2PO4] to [HPO42]? b What does the pH become if 25% of the hydrogen phosphate ions are converted to dihydrogen phosphate ion? c What does the pH become if 15% of the dihydrogen phosphate ions are converted to hydrogen phosphate ions?arrow_forwardWrite an equation for each of the following buffering actions. a. the response of a HPO42/PO43 buffer to the addition of OH ions b. the response of a HF/F buffer to the addition of OH ions c. the response of a HCN/CN buffer to the addition of H3O+ ions d. the response of a H3PO4/H2PO4 buffer to the addition of H3O+ ionsarrow_forward
- If each of the salts listed here were dissolved in water to give 0.10M solution, which solution would have the highest pH? Which would have the lowest pH? (a) Na2S (b) Na3PO4 (c) NaH2PO4 (d) NaF (e) NaCH3CO2 (f) AlCl3arrow_forwardThe fluoride ion is the conjugate base of the weak acid hydrofluoric acid. The value of K, for F, is 1.39x10-11. Write the equation for the reaction that goes with this equilibrium constant.arrow_forwardAn analytical chemist is titrating 161.1 mL of a 0.6100M solution of formic acid (H,CO,) with a 0.4600M solution of NaOH. The p K, of formic acid Is 3.74. Calculate the pH of the acid solution after the chemist has added 253.0 mL of the NaOH solution to it. Note for advanced students: you may assume the final volume equals the initial volume of the solutlon plus the volume of NaOH solution added. Round your answer to 2 decimal places. dlo Ar pH Explanation Check 2021 McGraw-Hill Education. All Rights Reserved. Terms of Use Privacy Accessibility O VO 12:15 hp esc & backspace # $ % @ 7 3 4 1 t y W e tab j k d. a C V shift alt ctrl V * 00 0.0 个arrow_forward
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