Homework Answers
Solution for question 2 has been provided
![We know that pH = pka + log [salt] [Acid] pH = 3.89 pka - 3.74 3.89 = 3.74 + log o {salt Acid] log (salt) = 3.89 - 3.74 = 0.1](http://img.homeworklib.com/questions/335f2f70-d3b8-11eb-b894-e59417c380d9.png?x-oss-process=image/resize,w_560)
If the pka of HCHO2 is 3.74 and the pH of an HCHO2/NaCHO2 solution is 3.89
If the pka of HCHO2 is 3.74 and the pH of an HCHO2/NaCHO2 solution is 3.89, which of the following is TRUE?
Question 2: A) Calculate the pH of the buffer that results from mixing 56.1 mL of...
Question 2: A) Calculate the pH of the buffer that results from mixing 56.1 mL of a 0.406 M solution of HCHO2 and 11.9 mL of a 0.606 M solution of NaCHO2. The Ka value for HCHO2 is 1.8×10−4 B) Calculate the initial pH and the final pH after adding 0.010 mol of NaOH. 300.0 mL of a buffer solution that is 0.225 M in HCHO2 and 0.280 M in KCHO2 C) Calculate the initial pH and the final pH...
The best buffer system for maintaining a pH of 3.74 is: A. HCHO2/NaCHO2 B. HNO2 /...
The best buffer system for maintaining a pH of 3.74 is: A. HCHO2/NaCHO2 B. HNO2 / NaNO2 C. HCN/NaCN Answer is A: How do you find this answer?
Lab 5 Buffers 1. Dissolved ions in salt solutions can act as acids or bases and...
Lab 5 Buffers 1. Dissolved ions in salt solutions can act as acids or bases and react with water to produce hydronium ions or hydroxide ions that contribute to the pH of the salt solution. Since strong acids and strong bases completely ionize in solution, the reverse reaction essentially does not occur, meaning that the resulting conjugate base of a strong acid or conjugate acid of a strong base do NOT act as acids or bases. Ions that are conjugate...
1) How would you make 300 ml of a 0.1 M sodium phosphate buffer, pH 7.0...
1) How would you make 300 ml of a 0.1 M sodium phosphate buffer, pH 7.0 (pKa = 7.2) phosphate dibasic (the conjugate base). 2) What are the concentrations of acetate and acetic acid in a 0.2 M acetate buffer pH 5.3? The pKa for acetic acid is 4.76. 3)You have 100 ml of 0.1 M acetate buffer pH 5.2 (pKa 4.76). You add 10 ml of 0.1 M NaOH. Calculate the resulting change in pH and the buffering capacity...
1) You are to make a buffer with a pH of 4.40. Below are the acids...
1) You are to make a buffer with a pH of 4.40. Below are the acids you have available for making that buffer (you also have the requisite conjugate bases): a. Circle the name of the best of the available acids for Weak acid |pka making that buffer. (1 pt.) Dichloroacetic acid 1.48 b. Tell me why that is the best of the available acids for Bromoacetic acid 2.69 making that buffer. (1 pt.) - Formic acid 3.75 Acetic acid...
Can you please check my work? I am having difficulty in differentiating my answers from pH>pKa...
Can you please check my work? I am having difficulty in
differentiating my answers from pH>pKa to pH<pKa. I do not
understand how acids and bases would be different among each other
in relation to pH and pKa. Guidance would be greatly appreciated.
Thank you.
D Question 5 8 pts pKa and pH pKa pH when the concentration of the protonated and deprotonated forms are the same. At a pH below the pKa, which form of a base will be...
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...
High buffer capacity: NaH2PO4-H2O (1.3804g) K2HPO4(0.551g) Target pH=6.7 Volume of buffer=40mL 1. using activity coefficients to...
High buffer capacity: NaH2PO4-H2O (1.3804g) K2HPO4(0.551g) Target pH=6.7 Volume of buffer=40mL 1. using activity coefficients to calculate the pH 2. calculate buffer capacity against acids(1mL 0.1M HCl) 3. calculate buffer capacity against bases(1mL 0.1M NaOH)
Please help, I'm so confused!!!! This is due wednesday night!!! i'm gonna fail :(((( pH of...
Please help, I'm so confused!!!! This is due wednesday night!!!
i'm gonna fail :((((
pH of Buffer Solutions Procedure: Acetic Acid-Sodium Acetate Buffer (pKa acetic acid = 4.75) Weigh about 3.5 g of Na2C2H302 3H2O, record the exact mass, and add to a 250 ml beaker. Measure exactly 8.8 mL of 3.0 M acetic acid (use 10 mL grad cylinder) and add to the beaker containing the sodium acetate. • Measure exactly 55.6 mL of distilled water and add to...
1) You are to make a buffer with a pH of 4.40. Below are the acids you have available for making that buffer (you also have the requisite conjugate bases): a. Circle the name of the best of the available acids for Weak acid |pka making that buffer. (1 pt.) Dichloroacetic acid 1.48 b. Tell me why that is the best of the available acids for Bromoacetic acid 2.69 making that buffer. (1 pt.) - Formic acid 3.75 Acetic acid...
Can you please check my work? I am having difficulty in
differentiating my answers from pH>pKa to pH<pKa. I do not
understand how acids and bases would be different among each other
in relation to pH and pKa. Guidance would be greatly appreciated.
Thank you.
D Question 5 8 pts pKa and pH pKa pH when the concentration of the protonated and deprotonated forms are the same. At a pH below the pKa, which form of a base will be...
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...
Please help, I'm so confused!!!! This is due wednesday night!!!
i'm gonna fail :((((
pH of Buffer Solutions Procedure: Acetic Acid-Sodium Acetate Buffer (pKa acetic acid = 4.75) Weigh about 3.5 g of Na2C2H302 3H2O, record the exact mass, and add to a 250 ml beaker. Measure exactly 8.8 mL of 3.0 M acetic acid (use 10 mL grad cylinder) and add to the beaker containing the sodium acetate. • Measure exactly 55.6 mL of distilled water and add to...
Most questions answered within 3 hours.
-
A simple random sample of 80 items from a population with σ =7
resulted in a...
asked 4 minutes ago -
Which test is used for independent data?
A. wilcoxon signed-rank test
B. wilcoxon rank sum test...
asked 5 minutes ago -
we
wish to estimate what percentage of adult residence in a certain
county are parents. out...
asked 22 minutes ago -
How do I calculate the kf for cyclohexane (pure
solvent)?
Also how to calculate the mass...
asked 21 minutes ago -
Alomar Co., a consolidated enterprise, conducted an impairment
review for each of its reporting units. In...
asked 22 minutes ago -
Write a public static method named
getMaxOf2Ints that takes in 2 int arguments and
returns the...
asked 46 minutes ago -
How will manager's behaviour change towards team members
as there would be a more cordial relationship...
asked 51 minutes ago -
You may need to use the appropriate appendix table or technology
to answer this question.
Consider...
asked 1 hour ago -
The U.S. textile industry has had difficulty competing with
foreign imports in the past. If the...
asked 58 minutes ago -
A reaction that produces ammonia is shown below. How does the
catalyst used in the industrial...
asked 1 hour ago -
JAVA CODE Beginner. please use if, else if or switch
statements, but don't use arrays, please ...
asked 1 hour ago -
On December 1, Year 1, Bradley Corporation incurs a 15-year
$200,000 mortgage liability in conjunction with...
asked 1 hour ago