Homework Answers
Question 2.
Part a.
KCl is neutral.
Explanation: KCl is formed by the combination of a strong acid (HCl) with a strong base (KOH). Hence, the salt doesn't undergo hydrolysis.
Part b.
HCO2H is acidic.
Explanation: HCOOH is a weak acid with Ka = 1.8*10-4.
Part c.
50:50 mixture of HCO2H + NaHCO2 is acidic.
Explanation: This is a buffer solution, where the pH = pKa = 3.74.
Part d.
(CH3)2NH2Cl is acidic.
Explanation: The salt dissociates into a strong conjugate acid.
Part e.
50:50 mixture of (CH3)2NH + (CH3)2NH2Cl is basic.
Explanation: This is a buffer solution, where the pH = pKa = 10.73.
Part f.
50:50 mixture of 0.1 M NaNO3 + 0.1 M HNO3 is acidic.
Explanation: The solution has the pH = -Log(0.1) = 1
Add Answer to:
QUESTIONS 1. Consider the buffer mixture that you created in Part C.1 of the procedure. a....
EQUL 499- Det. Of pH of Strong Acid, weak acid, salt, and buffer solution Discussion Topics...
EQUL 499- Det. Of pH of Strong Acid, weak acid, salt, and buffer solution Discussion Topics Discussion Topics (need to submit in Blackboard): 1. What is a buffer? • A buffer is a solution that, when introduced to a new environment, undergoes minimal pH change, typically when adding acidic or basic solutions. These are extremely important for life because the pH of human blood is delicate and even if it is changed by 0.1, there may be catastrophic effects. 2....
please help!! calculate pH of solutions on second page a-c!! 1. (4 points) A buffer solution...
please help!! calculate pH of solutions on second page a-c!!
1. (4 points) A buffer solution is created with C;H,NH, and 0.012 M C;HsNH2. The K, for C,H,NH2 is 4.7 х 104. What is the concentration of C,HNH, in the buffer solution that has a pH of 11.50? а. What is the concentration of the buffer solution if 0.0011 M HC is added to the buffer in part a.? b. Why is the buffer a basic solution? Could this weak...
#3, 8,9 Short Answer Questions: Worth 3.5 points each 1. In the reaction HECO + HO...
#3, 8,9
Short Answer Questions: Worth 3.5 points each 1. In the reaction HECO + HO HCO + H.Othe Bronsted acids are a. H.COs and HO HOand H.CO. c. HCO, and H.CO, d. H:CO, and HCO 2. Which one of these statements about strong acids ist ? a. All strong acids have H atoms bonded to electronegative oxygen atoms b. Strong acids are 100% ionized in water Strong acids are very concentrated acids d. Strong acids produce solutions with a...
buffer is HC2H3O2/NaC2H3O2 difference in PH: big change when added to buffer. small change when added...
buffer is HC2H3O2/NaC2H3O2
difference in PH: big change when added to buffer. small
change when added to water. why?
why such a bug change when you add an acud or base to water
but not to butfer?
1. a) Describe the difference in observed pH changes upon adding a small amount of strong acid or base to 25.0 mL of water vs to 25.0 mL of your buffer. b) Explain why there was a difference. 6.0M HC,H,O, is corrosive. Prevent...
i 52) (a) Use the enderson-Hasselbalch equation to calculate the pH of a buffer solution that...
i 52) (a) Use the enderson-Hasselbalch equation to calculate the pH of a buffer solution that is 0.45 M in and 0.15 M in NH,. (b) How would you prepare arn (The Ks for NH, is 1.8 x 10) NH4CI-NH, buffer that has a pHi of 9.007 of 0.100 M. The relevant equilibrium is shown below. What is the pH of this buffer solution? 9 54) At 40 C, the pH of water is 6.77, what is lon-Product Constant for...
Buffer B Buffer A o.3149 0.0317 Mass of NaC2H3O2 used to prepare buffer (g) 100.0 100.0...
Buffer B Buffer A o.3149 0.0317 Mass of NaC2H3O2 used to prepare buffer (g) 100.0 100.0 Volume of buffer prepared (mL) 1.0 0.1 Molar concentration of HC2H3O2 in buffer (M) 3.80 3.98 Initial pH of buffer Volume of 0.5 M NaOH to raise pH by 2 units (mL) 3. 9mL 34mL 1.5mL Volume of 0.5 M HCI to lower pH by 2 units (mL) 5.5mL Volume of 0.5 M NAOH at equivalence point (mL) ml 36.5mL 1. Buffer capacity has...
Question two A buffer solution is able to maintain a constant pH when small amounts of...
Question two
A buffer solution is able to maintain a constant pH when small amounts of acid or base are added to the buffer. Consider what happens when 1 mL of a 5 M solution is added or 0.005 mol of HCl are added to a 100.0 ml solution acetic acid buffer that contains 0.0100 mol of Acetic acid, HC,H,O,, and 0.0100 mol of sodium acetate, NaC,H,O2. The initial concentration of both the acid and the base are 0.0100 mol/0.1000...
In this experiment you will be measuring pH for several different solutions. A pH probe will...
In this experiment you will be measuring pH for several
different solutions. A pH probe will be used rather than pH paper
as it will be more accurate.
You will be testing the pH of six solutions: deionized water,
0.1 M HCl, 0.1 M HCH3COO, 0.1 M NaCH3COO, 0.1
M NaOH, and a buffer made by mixing equal parts of
HCH3COO and NaCH3COO.
You will measure the pH of each solution three times:
Neat - just the solution
After the...
2. If you prepared a 0.15 M CH.COH - 0.15 M CHCO Na buffer, would you expect the resulting buffer capacity t...
2. If you prepared a 0.15 M CH.COH - 0.15 M CHCO Na buffer, would you expect the resulting buffer capacity to be higher, lower, or the same as the buffer you prepared in Part II of this lab? Be specific and use your data. c. Measure the pH of the Beaker #2 solution, via a pH meter, and record in data sheet. Part II: Dilute Buffer Solution In this section, the pH of a 0.25 M CH3CO2H - 0.25...
help;( Data Sheet Titration and Buffers Name Date Part One: Buffer Solution (record the results from...
help;(
Data Sheet Titration and Buffers Name Date Part One: Buffer Solution (record the results from the video) Lab Section Number of Drops of HCl added to "water": Color changed from to Number of Drops of HCl added to "buffer": Color changed from to to Number of Drops of NaOH added to "water": Number of Drops of NaOH added to "buffer": _Color changed from Color changed from to Part Two: Titration Results for Acid-Base Neutralization (record the results from the...
EQUL 499- Det. Of pH of Strong Acid, weak acid, salt, and buffer solution Discussion Topics Discussion Topics (need to submit in Blackboard): 1. What is a buffer? • A buffer is a solution that, when introduced to a new environment, undergoes minimal pH change, typically when adding acidic or basic solutions. These are extremely important for life because the pH of human blood is delicate and even if it is changed by 0.1, there may be catastrophic effects. 2....
please help!! calculate pH of solutions on second page a-c!!
1. (4 points) A buffer solution is created with C;H,NH, and 0.012 M C;HsNH2. The K, for C,H,NH2 is 4.7 х 104. What is the concentration of C,HNH, in the buffer solution that has a pH of 11.50? а. What is the concentration of the buffer solution if 0.0011 M HC is added to the buffer in part a.? b. Why is the buffer a basic solution? Could this weak...
#3, 8,9
Short Answer Questions: Worth 3.5 points each 1. In the reaction HECO + HO HCO + H.Othe Bronsted acids are a. H.COs and HO HOand H.CO. c. HCO, and H.CO, d. H:CO, and HCO 2. Which one of these statements about strong acids ist ? a. All strong acids have H atoms bonded to electronegative oxygen atoms b. Strong acids are 100% ionized in water Strong acids are very concentrated acids d. Strong acids produce solutions with a...
buffer is HC2H3O2/NaC2H3O2
difference in PH: big change when added to buffer. small
change when added to water. why?
why such a bug change when you add an acud or base to water
but not to butfer?
1. a) Describe the difference in observed pH changes upon adding a small amount of strong acid or base to 25.0 mL of water vs to 25.0 mL of your buffer. b) Explain why there was a difference. 6.0M HC,H,O, is corrosive. Prevent...
i 52) (a) Use the enderson-Hasselbalch equation to calculate the pH of a buffer solution that is 0.45 M in and 0.15 M in NH,. (b) How would you prepare arn (The Ks for NH, is 1.8 x 10) NH4CI-NH, buffer that has a pHi of 9.007 of 0.100 M. The relevant equilibrium is shown below. What is the pH of this buffer solution? 9 54) At 40 C, the pH of water is 6.77, what is lon-Product Constant for...
Buffer B Buffer A o.3149 0.0317 Mass of NaC2H3O2 used to prepare buffer (g) 100.0 100.0 Volume of buffer prepared (mL) 1.0 0.1 Molar concentration of HC2H3O2 in buffer (M) 3.80 3.98 Initial pH of buffer Volume of 0.5 M NaOH to raise pH by 2 units (mL) 3. 9mL 34mL 1.5mL Volume of 0.5 M HCI to lower pH by 2 units (mL) 5.5mL Volume of 0.5 M NAOH at equivalence point (mL) ml 36.5mL 1. Buffer capacity has...
Question two
A buffer solution is able to maintain a constant pH when small amounts of acid or base are added to the buffer. Consider what happens when 1 mL of a 5 M solution is added or 0.005 mol of HCl are added to a 100.0 ml solution acetic acid buffer that contains 0.0100 mol of Acetic acid, HC,H,O,, and 0.0100 mol of sodium acetate, NaC,H,O2. The initial concentration of both the acid and the base are 0.0100 mol/0.1000...
In this experiment you will be measuring pH for several
different solutions. A pH probe will be used rather than pH paper
as it will be more accurate.
You will be testing the pH of six solutions: deionized water,
0.1 M HCl, 0.1 M HCH3COO, 0.1 M NaCH3COO, 0.1
M NaOH, and a buffer made by mixing equal parts of
HCH3COO and NaCH3COO.
You will measure the pH of each solution three times:
Neat - just the solution
After the...
2. If you prepared a 0.15 M CH.COH - 0.15 M CHCO Na buffer, would you expect the resulting buffer capacity to be higher, lower, or the same as the buffer you prepared in Part II of this lab? Be specific and use your data. c. Measure the pH of the Beaker #2 solution, via a pH meter, and record in data sheet. Part II: Dilute Buffer Solution In this section, the pH of a 0.25 M CH3CO2H - 0.25...
help;(
Data Sheet Titration and Buffers Name Date Part One: Buffer Solution (record the results from the video) Lab Section Number of Drops of HCl added to "water": Color changed from to Number of Drops of HCl added to "buffer": Color changed from to to Number of Drops of NaOH added to "water": Number of Drops of NaOH added to "buffer": _Color changed from Color changed from to Part Two: Titration Results for Acid-Base Neutralization (record the results from the...
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