Homework Answers
pKa is the negative base-10 logarithm of the acid dissociation constant (Ka) of a solution. Lower the pKa, stronger the acid. So in above question acid is stronger than conjugate base.
Note: pKa table ranks molecules in order of their acidity, from strongly acidic (e.g. HCl with pKa of –8) to weakly acidic (e.g. methane, pKa of ~50).
Add Answer to:
Question 4 for biochemistry.
4. Weak acids and pK, (if pK is 5.0, which is in...
3. Consider the following weak acids and their K, values, calculate the pK, for each acid....
3. Consider the following weak acids and their K, values, calculate the pK, for each acid. HC,H,O, - Acetic acid K. = 1.8 x 105 PK,= H,PO, - Phosphoric acid K = 7.1 x 10 PK, HCIO - Hypochlorous acid K = 3.5 x 10 pk = You want to prepare buffers at pH 2.8, 4.5 and 7.5. Which weak acid-conjugate base buffer system is the best choice for each pH from the acids listed? Write the reaction and indicate...
Exercise 1: Consider the following information for a series of solutions of weak acids, HA: Weak...
Exercise 1: Consider the following information for a series of solutions of weak acids, HA: Weak acid PK, К. If [HA], is... then [H3O+]E ... and pH HCOOH 3.74 1.8 x 10-4 0.100 M 4.2 x 10² M 2.38 HNO2 3.37 4.2 x 10-4 0.100 M 6.3 x 10-M 2.20 HCN 9.20 6.3 x 10-10 0.100 M 7.9 x 10ⓇM 5.10 4.23 0.100 M 5.9 10-M HOCI 7.46 3.5 x 10-8 0.200 M 8.3 x 10M 4.07 0.400 M 1.2...
Which of the following is a characteristic of bases? o taste sour O feel slippery O...
Which of the following is a characteristic of bases? o taste sour O feel slippery O higher than OH concentration O creates hydrogen gases when exposed to reactive metals QUESTION 38 A buffer: O resists changes in pH when small amounts of a strong acid or a strong base are added. o can be made up of a weak acid and its conjugate base. can be made up of a weak base and its conjugate acid. All three of the...
please correct Question 1 (1 point) Saved Certain acids are defined as weak acids which means...
please correct
Question 1 (1 point) Saved Certain acids are defined as weak acids which means that a small percentage of acid molecules ionize in water. True False Question 2 (1 point) Saved Strong acids, like Hydrochloric acid, completely ionize in water. True False Question 3 (1 point) Saved The equivalence point of titration is also known as the stoichiometric point or end point. True False Question 4 (1 point) Saved Phenolphthalein is a pH indicator which turns bright pink...
yellow blue or HIn is a weak acid with a pK, value of 5.0. It reacts...
yellow blue or HIn is a weak acid with a pK, value of 5.0. It reacts with water as represented in the sider the two beakers below. Each beaker has a layer of colorless oil (a nonpolon aqueous buffer layer of buffer solution is 7. A small and water layers are allowed to separate ucous buffer solution. In beaker X the pH of the buffer solution is 3, and in beaker Yth wate A small amount of HIn is placed...
(b) The amino acid lysine has the following values of pK : PK1 =2.2, pK2 = 8.9, PKR = 10.5 (the pK, of the amino gro...
(b) The amino acid lysine has the following values of pK : PK1 =2.2, pK2 = 8.9, PKR = 10.5 (the pK, of the amino group in the side chain). At pH 7 it has the structure shown below (6). Draw the structure that you would expect for lysine at pH 9.7, indicating the charges as appropriate. HZN 0 HINA (2 marks) (c) Phenol (C6H5OH) and 2,4,6-trichlorophenol (C6H2C13OH) are both weak acids with pK, values of 9.89 and 6.21, respectively,...
just answer please 10. For Lewis acids and bases, the base is defined as an electron...
just answer please
10. For Lewis acids and bases, the base is defined as an electron pair donor/acceptor (circle the correct answer). 11. When comparing anions from the same period, higher electronegativity of A in the H-A bond increases / decreases (circle the correct answer) acid strength 12. When comparing anions from the same group, larger size of A in the H A bond Increases / decreases (circle the correct answer) acid strength 13. A 0.10 M solution of a...
For each of the weak acids listed below, consider how you would make a buffer solution...
For each of the weak acids listed below, consider how you would make a buffer solution where the weak acid has a concentration of 0.5 M at equilibrium. Determine what molarity for each potassium conjugate base salt would need to be added to make 500 mL of an effective buffer with a pH of 5.32. Which acid would make the best buffer at this pH? Which conjugate base salt would be the most economical (cheapest) out of the three choices? ...
2) Draw the 2 reactions of the weak acid, Carbonic Acid (H2CO3) with water. Which form...
2) Draw the 2 reactions of the weak acid, Carbonic Acid (H2CO3) with water. Which form of carbonic acid predominates at physiological pH? The two pKas of carbonic acid are the following: pK,1 = 6.4 pK,2 = 10.3. (3 points) 3) You have a 0.1 M solution of HCl in water. HCl is a strong acid. What is the pH of this solution? (Show your work or will not receive credit.) (2 pts.) 4) Calculate the pOH of a solution...
10.2 Strong and Weak Acids and Bases Explain the Relationship Between Conjugate Acid-Base Pairs Question Lower...
10.2 Strong and Weak Acids and Bases Explain the Relationship Between Conjugate Acid-Base Pairs Question Lower values of K, Select the correct answer below: O correspond to greater values of K correspond to lower values of K O correspond to greater values of K O correspond to lower values of K FEEDBACK MORE INSTRUCTI MacBook Air
3. Consider the following weak acids and their K, values, calculate the pK, for each acid. HC,H,O, - Acetic acid K. = 1.8 x 105 PK,= H,PO, - Phosphoric acid K = 7.1 x 10 PK, HCIO - Hypochlorous acid K = 3.5 x 10 pk = You want to prepare buffers at pH 2.8, 4.5 and 7.5. Which weak acid-conjugate base buffer system is the best choice for each pH from the acids listed? Write the reaction and indicate...
Exercise 1: Consider the following information for a series of solutions of weak acids, HA: Weak acid PK, К. If [HA], is... then [H3O+]E ... and pH HCOOH 3.74 1.8 x 10-4 0.100 M 4.2 x 10² M 2.38 HNO2 3.37 4.2 x 10-4 0.100 M 6.3 x 10-M 2.20 HCN 9.20 6.3 x 10-10 0.100 M 7.9 x 10ⓇM 5.10 4.23 0.100 M 5.9 10-M HOCI 7.46 3.5 x 10-8 0.200 M 8.3 x 10M 4.07 0.400 M 1.2...
Which of the following is a characteristic of bases? o taste sour O feel slippery O higher than OH concentration O creates hydrogen gases when exposed to reactive metals QUESTION 38 A buffer: O resists changes in pH when small amounts of a strong acid or a strong base are added. o can be made up of a weak acid and its conjugate base. can be made up of a weak base and its conjugate acid. All three of the...
please correct
Question 1 (1 point) Saved Certain acids are defined as weak acids which means that a small percentage of acid molecules ionize in water. True False Question 2 (1 point) Saved Strong acids, like Hydrochloric acid, completely ionize in water. True False Question 3 (1 point) Saved The equivalence point of titration is also known as the stoichiometric point or end point. True False Question 4 (1 point) Saved Phenolphthalein is a pH indicator which turns bright pink...
yellow blue or HIn is a weak acid with a pK, value of 5.0. It reacts with water as represented in the sider the two beakers below. Each beaker has a layer of colorless oil (a nonpolon aqueous buffer layer of buffer solution is 7. A small and water layers are allowed to separate ucous buffer solution. In beaker X the pH of the buffer solution is 3, and in beaker Yth wate A small amount of HIn is placed...
(b) The amino acid lysine has the following values of pK : PK1 =2.2, pK2 = 8.9, PKR = 10.5 (the pK, of the amino group in the side chain). At pH 7 it has the structure shown below (6). Draw the structure that you would expect for lysine at pH 9.7, indicating the charges as appropriate. HZN 0 HINA (2 marks) (c) Phenol (C6H5OH) and 2,4,6-trichlorophenol (C6H2C13OH) are both weak acids with pK, values of 9.89 and 6.21, respectively,...
just answer please
10. For Lewis acids and bases, the base is defined as an electron pair donor/acceptor (circle the correct answer). 11. When comparing anions from the same period, higher electronegativity of A in the H-A bond increases / decreases (circle the correct answer) acid strength 12. When comparing anions from the same group, larger size of A in the H A bond Increases / decreases (circle the correct answer) acid strength 13. A 0.10 M solution of a...
2) Draw the 2 reactions of the weak acid, Carbonic Acid (H2CO3) with water. Which form of carbonic acid predominates at physiological pH? The two pKas of carbonic acid are the following: pK,1 = 6.4 pK,2 = 10.3. (3 points) 3) You have a 0.1 M solution of HCl in water. HCl is a strong acid. What is the pH of this solution? (Show your work or will not receive credit.) (2 pts.) 4) Calculate the pOH of a solution...
10.2 Strong and Weak Acids and Bases Explain the Relationship Between Conjugate Acid-Base Pairs Question Lower values of K, Select the correct answer below: O correspond to greater values of K correspond to lower values of K O correspond to greater values of K O correspond to lower values of K FEEDBACK MORE INSTRUCTI MacBook Air
Most questions answered within 3 hours.
-
convert grams into vloume with the density of water being at
.997514 g/cm^3 at 23.1 Celsuis...
asked 59 minutes ago -
Foreman company obtained a $20,000, 6% loan on May 1, 2018.
Principal and interest will be...
asked 1 hour ago -
5. Problem 11.05 (Discounted Payback)
eBook
Project L costs $60,000, its expected cash inflows are $14,000
per...
asked 1 hour ago -
1. Which of the following is true about politics and health
organizations?
A. Health organizations are...
asked 1 hour ago -
A space vehicle is coasting at a constant velocity of 18.1 m/s
in the +y direction...
asked 2 hours ago -
5) Use the following balanced equation to answer questions
(a)-(i).
3 Cu(s) + 8 HNO3(aq) →...
asked 2 hours ago -
A three-year maturity bond with a 12% annual coupon rate is
currently traded at par $1000...
asked 2 hours ago -
1.
What is the minimum volume to use in the Spec 20 cuvette in order
to...
asked 3 hours ago -
A builder wants to install wall-to-wall carpeting in a living
room of length 8.87 m and...
asked 3 hours ago -
Organizational change can produce anxiety in those affected by
the change. In what ways can change...
asked 3 hours ago -
Ozone in the atmosphere may react with nitric oxide.
From the following data, calculate the DG...
asked 3 hours ago -
Steven Long, a bond analyst, is analyzing a convertible bond.
The characteristics of the bond are...
asked 3 hours ago