Homework Answers
Answer:-
This question is solved by using the simple concept of buffer solution, using Kb value and its relation with Ka value.
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(A) Which of the following combinations will give a buffered solution that has a pH of...
Answer key is given in red. Please work out the problem in detail and explain it....
Answer key is given in red. Please work out the problem in
detail and explain it.
(A) Which of the following combinations will give a buffered solution that has a pH of about 5? Explain clearly the reason for your choice. a) NHs mixed with NH CI (K, for NHj- 1.8 x10) or b) CH,N mixed with C,H:NHCI (K, for CH,N - 1.7x10) pH pKa (B) What ratio of the concentrations of the conjugate acid/base pair from Part A will...
Experiment 11-Pre-lab Questions listed give the conjugate base, and indicate if a solution of the conjugate...
Experiment 11-Pre-lab Questions listed give the conjugate base, and indicate if a solution of the conjugate acid-base pair would act as a buffer. Acid a. HCI b. HF e. HNO, d. CH,CO,H e. HBr Conjugate base CI- Buffered Solution? No 2. A buffered solution will resist changes in pH when small amounts of acid or base are added. However if a large amount of acid or base is added, the buffer will cease to work and a large pH change...
hi there! please solve and show all work :) A buffered solution contains 0.50 M acetic...
hi there! please solve and show all work :)
A buffered solution contains 0.50 M acetic acid (HC2H302, K = 1.8 x10-5) and 0.50 M sodium acetate (NaC2H302)- "15pts) Calculate the pH of the solution: Calculate the pH after adding 0.020 mol NaOH into 1.00L of the buffer solution: m (base )
Design a buffer that has a pH of 11.20 using one of the weak base/conjugate acid...
Design a buffer that has a pH of 11.20 using one of the weak base/conjugate acid systems shown below K Къ к, pK Weak Base Conjugate Acid 4.2x104 CH3NH3 CH3NH2 2.4x10-11 10.62 C6H1503N5.9x10-7 CH1503NH 1.7x10-8 7.77 CsHsN 1.5x109 CH5NH 6.7x10-6 5.17 How many grams of the bromide salt of the conjugate acid must be combined with how many grams of the weak base, to produce 1.00 L of a buffer that is 1.00 M in the weak base? grams bromide...
• Buffer conceptual and calculation: • A chemist needs a pH 3.33 buffer. Select the best...
• Buffer conceptual and calculation: • A chemist needs a pH 3.33 buffer. Select the best choice from these four acids to start making a buffer nearest the desired pH. • Hydrofluoric acid, HF K = 6.8x10-4 • Formic acid, HCHO, Kg = 1.7x10-4 • Acetic acid, HCH,CO, K= 1.7x10-5 • Propionic acid, HC2H50, Ks = 1.3x10-5 Assume the best acid is combined with its appropriate conjugate base. What is the [base]/[acid) ratio needed to make the pH 3.33 buffer?...
A solution buffered at pH 3.90 is needed for a reaction. Would formic acid (HCOOH =...
A solution buffered at pH 3.90 is needed for a reaction. Would formic acid (HCOOH = HA) and its salt, sodium formate, NaHCO2 = NaA), make a good choice for this buffer? If so, what ratio of moles of A- and HA is needed? Use the Henderson Hasselbalch Equation. Ka formic acid = 1.8 x 10-4
Which of the following are accurate descriptions of buffer solutions? 1. If a solution is buffered, its pH is nearl...
Which of the following are accurate descriptions of buffer solutions? 1. If a solution is buffered, its pH is nearly neutral. II. The mechanism by which buffered solutions resist pH changes is not well understood. III. Addition of strong acid to a buffer shifts the equilibrium such that Ht is consumed. IV. If strong base is added to a buffer, it reacts with the acid component of the mixture. V. Buffers only work well if the one conjugate is present...
Please note - correct acid/base pair is highlighted. Second time posting this question. Will rate...
Please note - correct acid/base pair is highlighted. Second time
posting this question. Will rate answer, thanks.
Design a buffer that has a pH of 9.73 using one of the weak base/conjugate acid systems shown below. Weak Base K Conjugate AcidKa pKa CH NH 2.4x1011 10.6 CSHSN 15x09 CSHSNH 6.7x106 5.17 How many grams of the chloride salt of the conjugate acid must be combined with how many grams of the weak base, to produce 1.00 L of a buffer...
Question 13 The pH of a solution is 2.62 at 25°C. Calculate the pOH of this...
Question 13 The pH of a solution is 2.62 at 25°C. Calculate the pOH of this solution at 25°C. 4.88 11.4 8.33 Question 18 Calculate the pH of a 0.400 mol L-1 solution of formic acid, Kg = 1.8 x 10-4 2.29 2.07 4.00 3.44 3.71 Question 30 2 pts Which of the following is TRUE? A buffer has the best resistance to pH change when the buffer's pH is significantly lower than the pk, of the acid used to...
3,10 3. The pH of coffee is approximately 5.0. How many times greater is the [HO]...
3,10
3. The pH of coffee is approximately 5.0. How many times greater is the [HO] in coffee than in tap water having a pH of 8.0? Determine the plH of a KOH solution made by mixing 0.251 g KOH with enough water to make 1.0x102 mL of solution. 8. A) 0.62 B) 1.6 C) 30 D) 1,000 A) 1.35 B) 2.35 C) 7.00 D) 12.65 9. Assuming equal concentrations of conjugate base and acid, which one of the following...
Answer key is given in red. Please work out the problem in
detail and explain it.
(A) Which of the following combinations will give a buffered solution that has a pH of about 5? Explain clearly the reason for your choice. a) NHs mixed with NH CI (K, for NHj- 1.8 x10) or b) CH,N mixed with C,H:NHCI (K, for CH,N - 1.7x10) pH pKa (B) What ratio of the concentrations of the conjugate acid/base pair from Part A will...
Experiment 11-Pre-lab Questions listed give the conjugate base, and indicate if a solution of the conjugate acid-base pair would act as a buffer. Acid a. HCI b. HF e. HNO, d. CH,CO,H e. HBr Conjugate base CI- Buffered Solution? No 2. A buffered solution will resist changes in pH when small amounts of acid or base are added. However if a large amount of acid or base is added, the buffer will cease to work and a large pH change...
hi there! please solve and show all work :)
A buffered solution contains 0.50 M acetic acid (HC2H302, K = 1.8 x10-5) and 0.50 M sodium acetate (NaC2H302)- "15pts) Calculate the pH of the solution: Calculate the pH after adding 0.020 mol NaOH into 1.00L of the buffer solution: m (base )
Design a buffer that has a pH of 11.20 using one of the weak base/conjugate acid systems shown below K Къ к, pK Weak Base Conjugate Acid 4.2x104 CH3NH3 CH3NH2 2.4x10-11 10.62 C6H1503N5.9x10-7 CH1503NH 1.7x10-8 7.77 CsHsN 1.5x109 CH5NH 6.7x10-6 5.17 How many grams of the bromide salt of the conjugate acid must be combined with how many grams of the weak base, to produce 1.00 L of a buffer that is 1.00 M in the weak base? grams bromide...
• Buffer conceptual and calculation: • A chemist needs a pH 3.33 buffer. Select the best choice from these four acids to start making a buffer nearest the desired pH. • Hydrofluoric acid, HF K = 6.8x10-4 • Formic acid, HCHO, Kg = 1.7x10-4 • Acetic acid, HCH,CO, K= 1.7x10-5 • Propionic acid, HC2H50, Ks = 1.3x10-5 Assume the best acid is combined with its appropriate conjugate base. What is the [base]/[acid) ratio needed to make the pH 3.33 buffer?...
Which of the following are accurate descriptions of buffer solutions? 1. If a solution is buffered, its pH is nearly neutral. II. The mechanism by which buffered solutions resist pH changes is not well understood. III. Addition of strong acid to a buffer shifts the equilibrium such that Ht is consumed. IV. If strong base is added to a buffer, it reacts with the acid component of the mixture. V. Buffers only work well if the one conjugate is present...
Please note - correct acid/base pair is highlighted. Second time
posting this question. Will rate answer, thanks.
Design a buffer that has a pH of 9.73 using one of the weak base/conjugate acid systems shown below. Weak Base K Conjugate AcidKa pKa CH NH 2.4x1011 10.6 CSHSN 15x09 CSHSNH 6.7x106 5.17 How many grams of the chloride salt of the conjugate acid must be combined with how many grams of the weak base, to produce 1.00 L of a buffer...
Question 13 The pH of a solution is 2.62 at 25°C. Calculate the pOH of this solution at 25°C. 4.88 11.4 8.33 Question 18 Calculate the pH of a 0.400 mol L-1 solution of formic acid, Kg = 1.8 x 10-4 2.29 2.07 4.00 3.44 3.71 Question 30 2 pts Which of the following is TRUE? A buffer has the best resistance to pH change when the buffer's pH is significantly lower than the pk, of the acid used to...
3,10
3. The pH of coffee is approximately 5.0. How many times greater is the [HO] in coffee than in tap water having a pH of 8.0? Determine the plH of a KOH solution made by mixing 0.251 g KOH with enough water to make 1.0x102 mL of solution. 8. A) 0.62 B) 1.6 C) 30 D) 1,000 A) 1.35 B) 2.35 C) 7.00 D) 12.65 9. Assuming equal concentrations of conjugate base and acid, which one of the following...
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