At what pH will the concentration of a compound with a pK, 8,4 be 100 tímes greater in ita acidic form than in its basic form?Express your answer using one decimal place.pH= 7.9At what pH will 50% of a compound with a pK, = 7.6 be in its basic form?Express your answer using one decimal place.pH =At what pH will the concentration of a compound with a pK = 4.6 be 10 times greater in its basic form than in its acidic form?Express your answer using one decimal place.pH =SubmitDanunet Anenr

Reaction involved :- HA + OH-1 = A- + H2O HA = acidic form A- = basic form

Answered: At what pH will the concentration of a…

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter14: Acids And Bases

Section: Chapter Questions

Problem 38QRT

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16-27 Guanidine, p/Ca 13.6, is a very strong base, almost as basic as hydroxide ion. NH NH2+ II II H2N—C—NH2 + H2O H2N—C—NH2 + OH" Guanidine Guanidinium ion pKb = 13.6 Complete the Lewis structure for guanidine, showing all valence electrons. The remarkable basicity of guanidine is attributed to the fact that the positive charge on the guanidinium ion is delocalized by resonance over the three nitrogen atoms. This delocalization increases the stability of the guanidinium ion relative to the ammonium ion or substituted ammonium ions. Draw three equivalent contributing structures for the guanidinium ion and show by the use of curved arrows how these three contributors are related. Propose an explanation for the fact that protonation occurs on the C=NH nitrogen rather than on one of the —NH., nitrogens. (Hint: Consider the resonance stabilization of the structure formed by protonation on a —NH., nitrogen compared with the resonance stabilization of the structure formed by protonation on the =NH nitrogen.) Predict the N—C—N bond angles in the hybrid. Which is the stronger acid, the ammonium ion or the guanidinium ion?
Complete a net ionic equation for each proton-transfer reaction using curved arrows to show the flow of electron pairs in each reaction. In addition, write Lewis structures for all starting materials and products. Label the original acid and its conjugate base; label the original base and its conjugate acid. If you are uncertain about which substance in each equation is the proton donor, refer to Table 4.1 for the relative strengths of proton acids. (a) NH3+HCl (b) CH3CH2O+HCl (c) HCO3+OH (d) CH3COO+NH4+
In a hospital laboratory the pH of a bile sample is measured as 7.90 at 25 °C. Calculate the H3O+ concentration. Is the sample acidic or basic?
Which has the larger numerical value? (a) The pKa of a strong acid or the pKa of a weak acid (b) The Ka of a strong acid or the Ka of a weak acid
For each equation, label the Lewis acid and the Lewis base. In addition, show all unshared pairs of electrons on the reacting atoms and use curved arrows to show the flow of electrons in each reaction. (a) F + BF3 BF4
A very strong base can remove a proton from methylamine:
Answer true or false to the following statements about the mechanism of acid-base reactions. (a) The acid and base must encounter each other by a collision in order for the proton to transfer. (b) All collisions between acids and bases result in proton transfer. (c) During an acid-base reaction the lone pair on the base fills the A-H antibonding sigma orbital.
When 0.1000mol of an unknown acid, represented by HA, are dissolved in enough water to make 1.000L of solution the resulting pH is 2.20. Calculate the value of Ka for HA. Calculate the pH of a solution made from dissolving 0.100mol of acetic acid (HC2H3O2) in enough water to make a 1.00L solution. The Ka of formic acid (HCHO2) is 1.7x10-4. Calculate Kb of the formate ion, CHO2- Determine the pH of a 1.0M solution of (CH3)3NHCl. Kb =6.3x10-5 for trimethylamine, (CH3)3N.
In calculating pH by ICE method of 0.015 M CH2FCOOH (Ka CH2FCOOH = 2.6 x10-3), the change in CH2FCOOH can not be neglected because. a. Acid Dissociation constant, Ka, has a negative exponent. b. pH is not within +/- pka unit of pka of CH2FCOOH c. initial CH2FCOOH concentration is less than 0.1 M d. dissociation of [CH2FCOOH] will be more than 5% of initial [CH2FCOOH] ----------- To protect corrosion of materials made of iron, the surface of the iron material is electroplated with another metal. Given below information, which metal will be best to “galvanize” the material ? O2 + H2O + 2e- -> 4OH-(aq) .... E0 = 0.401 v Fe2+(g) + 2e- - -> Fe ............ E0 =(-) 0.440 v Cu2+(g) + 2e- - -> Cu ...........E0 = 0.337 v Ni2+(g) + 2e- - -> Ni ............ E0 = (-)0.250 v Zn2+(g) + 2e- - -> Zn ............ E0 =(-) 0.763 v a. Zn b. Ni c. Cu d. Fe2+ ------------ Given : C (s) + H2O(g) <-> CO(g) + H2(g) Which of the following will shift equilibria to form…
For a certain acid pK, = 5.88. Calculate the pH at which an aqueous solution of this acid would be 0.39% dissociated. Round your answer to 2 decimal places. https://www.bartleby.com/questions-and-answers/for-a-certain-acid-pk-5.88.-calculate-the-ph-at-which-an-aqueous-solution-of-this-acid-would-be-0.39/ef43d1ea-20b6-4a18-a2de-0e68dc00c305

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