Homework Answers
Kb is dissociation constant of base.
Greater value of Kb implies stronger is the base.
Order of Kb from largest to smallest is:
Ethylamine
Methylamine
ammonia
Pyridine
Same will be the order of base
Answer:
Ethylamine
Methylamine
ammonia
Pyridine
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The table shows four bases and their base dissociation constants. Kh Base ammonia ethylamine methylamine pyridine...
Consider the following table: Name Formula Conjugate Acid Ammonia NH3 ΝΗ, Methylamine CH3NH2 CH, NH3 +...
Consider the following table: Name Formula Conjugate Acid Ammonia NH3 ΝΗ, Methylamine CH3NH2 CH, NH3 + Ethylamine C2H5NH2 C,HNH3 Aniline CH NH2 CH3NH, Pyridinem CH N CH NH Kb 1.8 x 10-5 4.38 x 10-4 5.6 x 10-4 3.8 x 10-10 1.7 x 10-9 Which base would be the best choice for preparing a pH = 9.50 buffer? methylamine pyridine ethylamine aniline ammonia
Use acid-dissociation constants in Table 16.3 to arrange the oxyanions from strongest to weakest base: SO42-,...
Use acid-dissociation constants in Table 16.3 to arrange the oxyanions from strongest to weakest base: SO42-, CO32-, SO32-, and PO43-.
(8 pts) Comparing dissociation constants, circle the strongest base in the following pairs. You must justify...
(8 pts) Comparing dissociation constants, circle the strongest base in the following pairs. You must justify your reasoning and show any calculations to receive credit. 5. Circle the strongest base in the pair: A. CsHsN and NHs and (pyridine and ammonia bases) Justification: B. PO. and AsO. and (phosphate and arsenate) Justification: 6. (10 pts) Calculate Ka of a weak acid given that a 2.3 M HA solution has a pH of 1.55. Ka: 7, (10 pts) Calculate the pH...
The following shows a list of weak acids and bases with their Ka and Kb values....
The following shows a list of weak acids and bases with their Ka and Kb values. Substances Ka Substances Kb Cyanic acid (HCN) 4.9 x 10-10 Ammonia (NH3) 1.8 x 10-5 Nitrous acid (HNO2) 4.5 x 10-4 Aniline (C6H5NH2) 4.3 x 10-10 Hydrofluoric acid (HF) 6.8 x 10-4 Pyridine (C5H5N) 1.7 x 10-9 Acetic acid (CH3COOH) 1.8 x 10-5 Methylamine (CH3NH2) 4.4 x 10-4 If you want to make a pH 8.0 buffer solution, which of the following acids or...
Conjugate Name Formula Kb Question3 Acid NH4 CH3NH,+ 4.38 x 104 Question 4 Ammonia NH3 1.8...
Conjugate Name Formula Kb Question3 Acid NH4 CH3NH,+ 4.38 x 104 Question 4 Ammonia NH3 1.8 x 10-5 Methylamine CHNH2 Question 5 1 pt C2HsNH2 C2H, NH 5.6 x 104 hylamine Aniline Pyridine Question6 CoH, NH2C6H,NH3+ 3.8 x 1010 Question 7 CsHsNH+ 1.7 x 109 Question 8 1 pt Which base would be the best choice for preparing a pH- 9.50 Question 9 buffer? O aniline O ammonia Oethylamine Question 10 Question 11 1 pt pyridine Omethylamine
6. What is the pH of 1 x 10 M HC1? a. 6.00 b. 6.98 C....
6. What is the pH of 1 x 10 M HC1? a. 6.00 b. 6.98 C. 7.98 d. 8.00 e. need K 7. What is the pH of 2.7 M Ba(OH)2? a. pH--0.726 b. pH 0.425 c. pH 5.32 d. pH 13.27 e. pH 14.73 After completing the following unfinished Base lonization table, what is the order of increasing base strength? 8. Base рк, Bicarbonate ion, HCO3 Pyridine, C$HsN Acetate ion, CH3COO 2.2 x 10-8 8.77 5.7 x 10-10 a....
ACIDS AND BASES = Predicting the que base properties of salts Consider the following data on...
ACIDS AND BASES = Predicting the que base properties of salts Consider the following data on some weak acids and weak bases: acid name formula hypochlorous acid HClO hydrofluoric acid HF 3.0 x 10-8 base name formula methylamine CH NH, 4.4 x 10-4 pyridine CHN 1.7* 109 6.8 x 10 4 data to rank the following solutions in order of increasing pH. In other words, select the solution that will have the next lowest pH, and so on. solution pH...
K Consider the following data on some weak acids and weak bases: adid base name formula...
K Consider the following data on some weak acids and weak bases: adid base name formula name formula hypochlorous add HCIO |3.0 x 10-8 Pyridine CHN 1.7*10-9 acetic add HCH,CO2 1.8 * 10-5 ethylamine C, H, NH2 6.4 x 10-4 Use this data to rank the following solutions in order of increasing pH. In other words, select a 'l' next to the solution that to the solution that will have the next lowest pH, and so on. solution 0.1 M...
1. A hydrogen atom in the organic base pyridine, CsHsN, can be substituted by various atoms...
1. A hydrogen atom in the organic base pyridine, CsHsN, can be substituted by various atoms or groups to give XCsH4N, where X is an atom such as Cl or a group such as CH3. The following table gives K, values for the conjugate acids of a variety of substituted pyridines. Atom or Group X (aq) + HCl(aq) → (aq) + Cl-(aq) NO K, of Conjugate Acid 5.9 x 10-2 1.5 x 10-4 6.8 x 10-6 1.0 x 10-6 н....
Consider the following data on some weak acids and weak bases: acid name Ka formula base...
Consider the following data on some weak acids and weak bases: acid name Ka formula base Ko name formula ethylamine C2H5NH2 6.4 x 10-4 hydrofluoric acid HF 6.8 x 10-4 acetic acid HCH3CO2 1.8 x 10-5 methylamine CH3NH2 4.4 x 10-4 Use this data to rank the following solutions in order of increasing pH. In other words, select a 'l' next to the solution that will have the lowest pH, a '2' next to the solution that will have the...
Consider the following table: Name Formula Conjugate Acid Ammonia NH3 ΝΗ, Methylamine CH3NH2 CH, NH3 + Ethylamine C2H5NH2 C,HNH3 Aniline CH NH2 CH3NH, Pyridinem CH N CH NH Kb 1.8 x 10-5 4.38 x 10-4 5.6 x 10-4 3.8 x 10-10 1.7 x 10-9 Which base would be the best choice for preparing a pH = 9.50 buffer? methylamine pyridine ethylamine aniline ammonia
(8 pts) Comparing dissociation constants, circle the strongest base in the following pairs. You must justify your reasoning and show any calculations to receive credit. 5. Circle the strongest base in the pair: A. CsHsN and NHs and (pyridine and ammonia bases) Justification: B. PO. and AsO. and (phosphate and arsenate) Justification: 6. (10 pts) Calculate Ka of a weak acid given that a 2.3 M HA solution has a pH of 1.55. Ka: 7, (10 pts) Calculate the pH...
Conjugate Name Formula Kb Question3 Acid NH4 CH3NH,+ 4.38 x 104 Question 4 Ammonia NH3 1.8 x 10-5 Methylamine CHNH2 Question 5 1 pt C2HsNH2 C2H, NH 5.6 x 104 hylamine Aniline Pyridine Question6 CoH, NH2C6H,NH3+ 3.8 x 1010 Question 7 CsHsNH+ 1.7 x 109 Question 8 1 pt Which base would be the best choice for preparing a pH- 9.50 Question 9 buffer? O aniline O ammonia Oethylamine Question 10 Question 11 1 pt pyridine Omethylamine
6. What is the pH of 1 x 10 M HC1? a. 6.00 b. 6.98 C. 7.98 d. 8.00 e. need K 7. What is the pH of 2.7 M Ba(OH)2? a. pH--0.726 b. pH 0.425 c. pH 5.32 d. pH 13.27 e. pH 14.73 After completing the following unfinished Base lonization table, what is the order of increasing base strength? 8. Base рк, Bicarbonate ion, HCO3 Pyridine, C$HsN Acetate ion, CH3COO 2.2 x 10-8 8.77 5.7 x 10-10 a....
ACIDS AND BASES = Predicting the que base properties of salts Consider the following data on some weak acids and weak bases: acid name formula hypochlorous acid HClO hydrofluoric acid HF 3.0 x 10-8 base name formula methylamine CH NH, 4.4 x 10-4 pyridine CHN 1.7* 109 6.8 x 10 4 data to rank the following solutions in order of increasing pH. In other words, select the solution that will have the next lowest pH, and so on. solution pH...
K Consider the following data on some weak acids and weak bases: adid base name formula name formula hypochlorous add HCIO |3.0 x 10-8 Pyridine CHN 1.7*10-9 acetic add HCH,CO2 1.8 * 10-5 ethylamine C, H, NH2 6.4 x 10-4 Use this data to rank the following solutions in order of increasing pH. In other words, select a 'l' next to the solution that to the solution that will have the next lowest pH, and so on. solution 0.1 M...
1. A hydrogen atom in the organic base pyridine, CsHsN, can be substituted by various atoms or groups to give XCsH4N, where X is an atom such as Cl or a group such as CH3. The following table gives K, values for the conjugate acids of a variety of substituted pyridines. Atom or Group X (aq) + HCl(aq) → (aq) + Cl-(aq) NO K, of Conjugate Acid 5.9 x 10-2 1.5 x 10-4 6.8 x 10-6 1.0 x 10-6 н....
Consider the following data on some weak acids and weak bases: acid name Ka formula base Ko name formula ethylamine C2H5NH2 6.4 x 10-4 hydrofluoric acid HF 6.8 x 10-4 acetic acid HCH3CO2 1.8 x 10-5 methylamine CH3NH2 4.4 x 10-4 Use this data to rank the following solutions in order of increasing pH. In other words, select a 'l' next to the solution that will have the lowest pH, a '2' next to the solution that will have the...
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