Part 1: Which pair of substances would make a good buffer system? a. H2PO4-/HPO42- b. H2PO4-/HPO42...
Part 1:
Which pair of substances would make a good buffer system?
a. H2PO4-/HPO42-
b. H2PO4-/HPO42
c. SO42-/H2SO4
d. HCl/NaOH
Part 2:
Should the concentrations of the two buffer components be present at relatively high and concentrations close to each other or low with concentrations far from each other ?
a. far and low
b. close and high
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Part 1:
Which pair of substances would make a good buffer system?
a. H2PO4-/HPO42-
b. H2PO4-/HPO42...
To make 1.00 L of a 0.100 M H2PO4- / HPO42- buffer at pH 6.90 and...
To make 1.00 L of a 0.100 M H2PO4- / HPO42- buffer at pH 6.90 and you start with the NaH2PO4, A. Calculate the mass of NaH2PO4 needed to make the buffer. B. Should HCl or NaOH be added to make the final buffer? Calculate the number of moles of HCl or NaOH that needs to be added. Note: formula mass of NaH2PO4 is 120.
In our experiment, we will be using a portion of the phosphate buffer system that is...
In our experiment, we will be using a portion of the phosphate buffer system that is based upon the following equilibrium: H2PO4- HPO42- + H+ pKa = 7.2 In this case, H2PO4- will act as the acid and HPO42- will act as the base. Materials: 1M NaOH: 40.01 g/L of solution 1M HCl: 83 mL conc. HCl/L of solution Potassium phosphate, dibasic, K2HPO4, MW= 174.18 Potassium phosphate, monobasic, KH2PO4 MW= 136.09 **I already preformed this lab, but I struggled a...
PART B MELTING POINTS OF SOME ORGANIC SUBSTANCES Circle the pair of substances of which you measured the melting point...
PART B MELTING POINTS OF SOME ORGANIC SUBSTANCES Circle the pair of substances of which you measured the melting point range 7 2-naphthol (A) and naphthalene (B) benzophenone (A) and benzil (B Complete the following table: [6 marks] Hint Molecules containing only Cand H can be assumed to be non-polar Present in Present in А Stronger in which substance? Why? Intermolecular Force В (yes or no) (yes or no) London Dispersion Dipole-Dipole Hydrogen Bonding Which of the two substances that...
1) Which of the following pairs would make suitable buffers? For each pair that does not,...
1) Which of the following pairs would make suitable buffers? For each pair that does not, indicate why. (4 points) a) HS/HS b) HBr/Br c) NH4+NH, d) HC204/C2012- e) CH3NH,*/HS f) HNO/NO2 g) H2SO./HSO4 h) HF/Br 2) Which of the following pairs would make suitable buffers? For each pair that does not, indicate why. (3 points) a) 0.1 L of 1 M NH4 and 1 L of 1 M NH b) 0.1 L of 0.1 M HCL of 1 M...
Given: pH: 7.60 Concentration (M): 0.050 mL: 100mL Determine the Mass of Each Component Recall that...
Given: pH: 7.60 Concentration (M): 0.050 mL: 100mL Determine the Mass of Each Component Recall that buffers are formed from conjugate acid/base pairs. Using the information given about your assigned buffer, determine how much of each component (acid and base) you will need in order to prepare it in the lab. (This will require a system of equations because there are two “unknowns.”) Note: the conjugate acid in this case is H2PO4−, and the conjugate base is HPO42−. 1. Using...
QUESTIONS 1. Consider the buffer mixture that you created in Part C.1 of the procedure. a....
QUESTIONS 1. Consider the buffer mixture that you created in Part C.1 of the procedure. a. How many moles of NaC,H,O, are contained in 12 mL of buffer? b. How many moles of HCI would need to be added to 12 mL of buffer to destroy the system (.e., completely neutralize the base in the buffer)? c. How many mL of 3.0 M HCl would be needed to destroy 12 mL of the buffer system? 2. State whether each of...
I added everything thing. this is the lab question you need to solve. First assigned buffer...
I added everything thing.
this is the lab question you need to solve.
First assigned buffer pH: 2.031 Second assigned buffer pH: 9.171 Available Buffer Systems (acid/ base) pka of Conjugate Acid 2.847 4.757 malonic acid/ monosodium malonate acetic acid/ sodium acetate ammonium chloride/ ammonia triethylammonium chloride/ triethylamine 9.244 10.715 1) Buffer system details: Given pH Name and volume conjugate acid Name and volume conjugate base 2) Calculations for preparation of high capacity buffer system. Introduction In this experiment, you...
Given: pH: 7.60 Concentration (M): 0.050 mL: 100mL Determine the Mass of Each Component Recall that...
Given: pH: 7.60 Concentration (M): 0.050 mL: 100mL Determine the Mass of Each Component Recall that buffers are formed from conjugate acid/base pairs. Using the information given about your assigned buffer, determine how much of each component (acid and base) you will need in order to prepare it in the lab. (This will require a system of equations because there are two “unknowns.”) Note: the conjugate acid, in this case, is H2PO4−, and the conjugate base is HPO42−. Equations 1...
Part B For each ion you propose, explain the ways in which it would be similar to Na+ and the ways it would be differen...
Part B For each ion you propose, explain the ways in which it would be similar to Na+ and the ways it would be different Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer. Reset Help Mg size Because Nat has a 1+ charge, you would need a cation with a and a 1+ charge. Ne small and Looking at the size...
3. To make a buffer solution, you can start with a solution of a known number...
3. To make a buffer solution, you can start with a solution of a known number of moles of the base form (A) and add a strong acid until you have neutralized the correct number of moles of the base to have the correct A HA ratio for the buffer you require. For the example using HF in the background information: a. How many moles of the base form (A) are required to start? HINT: The acid form (HA) will...
PART B MELTING POINTS OF SOME ORGANIC SUBSTANCES Circle the pair of substances of which you measured the melting point range 7 2-naphthol (A) and naphthalene (B) benzophenone (A) and benzil (B Complete the following table: [6 marks] Hint Molecules containing only Cand H can be assumed to be non-polar Present in Present in А Stronger in which substance? Why? Intermolecular Force В (yes or no) (yes or no) London Dispersion Dipole-Dipole Hydrogen Bonding Which of the two substances that...
1) Which of the following pairs would make suitable buffers? For each pair that does not, indicate why. (4 points) a) HS/HS b) HBr/Br c) NH4+NH, d) HC204/C2012- e) CH3NH,*/HS f) HNO/NO2 g) H2SO./HSO4 h) HF/Br 2) Which of the following pairs would make suitable buffers? For each pair that does not, indicate why. (3 points) a) 0.1 L of 1 M NH4 and 1 L of 1 M NH b) 0.1 L of 0.1 M HCL of 1 M...
QUESTIONS 1. Consider the buffer mixture that you created in Part C.1 of the procedure. a. How many moles of NaC,H,O, are contained in 12 mL of buffer? b. How many moles of HCI would need to be added to 12 mL of buffer to destroy the system (.e., completely neutralize the base in the buffer)? c. How many mL of 3.0 M HCl would be needed to destroy 12 mL of the buffer system? 2. State whether each of...
I added everything thing.
this is the lab question you need to solve.
First assigned buffer pH: 2.031 Second assigned buffer pH: 9.171 Available Buffer Systems (acid/ base) pka of Conjugate Acid 2.847 4.757 malonic acid/ monosodium malonate acetic acid/ sodium acetate ammonium chloride/ ammonia triethylammonium chloride/ triethylamine 9.244 10.715 1) Buffer system details: Given pH Name and volume conjugate acid Name and volume conjugate base 2) Calculations for preparation of high capacity buffer system. Introduction In this experiment, you...
Part B For each ion you propose, explain the ways in which it would be similar to Na+ and the ways it would be different Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer. Reset Help Mg size Because Nat has a 1+ charge, you would need a cation with a and a 1+ charge. Ne small and Looking at the size...
3. To make a buffer solution, you can start with a solution of a known number of moles of the base form (A) and add a strong acid until you have neutralized the correct number of moles of the base to have the correct A HA ratio for the buffer you require. For the example using HF in the background information: a. How many moles of the base form (A) are required to start? HINT: The acid form (HA) will...
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