Homework Answers
Answer: C
pH of acidic buffer = pka + log(NaCN/HCN)
pka of HcN = 9.2
no of mol of HCN = 0.6 mole
no of mol of NaCN = 0.5 mole
pH = 9.2+log(0.5/0.6) = 9.121
in the hendersons equation, the ratio of concentration of NaCN to HCN is used,so that, pH do not change by changing volume of water.
Add Answer to:
please explain
Imagine that you use 0.6 moles of HCN (PK. = 9.2) and 0.5 moles...
Part A You need to produce a buffer solution that has a pH of 5.14. You...
Part A You need to produce a buffer solution that has a pH of 5.14. You already have a solution that contains 10. mmol (millimoles) of acetic acid. How many millimoles of acetate (the conjugate base of acetic acid) will you need to add to this solution? The pk of acetic acid is 4.74 Express your answer numerically in millimoles. View Available Hint(s) V AED ROO? mmol acetate Pall A beaker with 1 90x102 mL of an acetic acid buffer...
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...
Please help me with this work problem and explain. Determine the pH of the following solutions:...
Please help me with this work problem and explain. Determine the pH of the following solutions: a) You dissolve 3.42 g of acetic acid with enough water in a 250.0 ml volumetric flask. Ka = 1.76*10^-5 b) You dissolve 2.64 g of sodium acetate with enough water in a 250.0 ml volumetric flask. c) You mix all solutions A and B from above together into a larger beaker( buffer solution) d) You add 420 ml of 0.75 NaOH into solution...
pH of 9.2 using ammonium nitrate: pKa= 9.24 2 Introduiction The Henderson-Hasselbalch equation, or A-1 HAl relates the pH of a buffer with the pKo of the acid and the concentration of the conju...
pH
of 9.2
using ammonium nitrate: pKa= 9.24
2 Introduiction The Henderson-Hasselbalch equation, or A-1 HAl relates the pH of a buffer with the pKo of the acid and the concentration of the conjugate base A- and the monoprotic acid HA. In cq. (1), pH-_ log[H+], pK, =-log Ka, and [J]i and [JIe are the initial and equilibrium molar concentration of the Jth species, respectively. The buffering capacity of the buffer is given by [1] Ka H+ where K,e-1.0 ×...
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...
Please answer within 40 minutes for when the question is due, thank you! |-/0.5 points GVSUCHEM116V2...
Please answer within 40 minutes for when the question
is due, thank you!
|-/0.5 points GVSUCHEM116V2 14.6.3.P004. My Notes Calculating the pH of a Buffer Solution To prepare a buffer you weigh out 9.00 grams of KNO2 and place it into a 500.00 mL volumetric flask. To this flask you add 18.0 mL of 3.80 M HNO, and then fill it about halfway with distilled water, swirling to dissolve the contents. Finally, the flask is filled the rest of the...
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...
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...
Please help with the prelab questions! thank you!!!! Especially 2 and 3! Pre-Lab Questions 1. Calculate...
Please help with the prelab questions! thank you!!!!
Especially 2 and 3!
Pre-Lab Questions 1. Calculate the theoretical equivalence point (the volume!) in terms of ml NaOH adde each of the titrations. Assume the concentration of acid is 0.81 M and the concentration of base is 0.51 M. 2. Which equation can be used to find the pH of a buffer? Calculate the pH of a buffer containing 0.20 M CH3COOH and 0.20 M CH3COONa. What is the pH after...
1 Review Constants Periodic Table You have to prepare a pH 5.07 buffer, and you have...
1 Review Constants Periodic Table You have to prepare a pH 5.07 buffer, and you have the following 0.10 M solutions available: HCOOH, HCOONa, CH, COOH, CH3COONa, HCN, and NaCN. Correct Part B How many milliliters of each solution would you use to make approximately a liter of the buffer? Express your answers using two significant figures. Enter your answers numerically separated by a comma. IVO AXO A O 2 ? Vch. cooh , Vch,cooNa = 333,667 Submit Previous Answers...
Part A You need to produce a buffer solution that has a pH of 5.14. You already have a solution that contains 10. mmol (millimoles) of acetic acid. How many millimoles of acetate (the conjugate base of acetic acid) will you need to add to this solution? The pk of acetic acid is 4.74 Express your answer numerically in millimoles. View Available Hint(s) V AED ROO? mmol acetate Pall A beaker with 1 90x102 mL of an acetic acid buffer...
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...
pH
of 9.2
using ammonium nitrate: pKa= 9.24
2 Introduiction The Henderson-Hasselbalch equation, or A-1 HAl relates the pH of a buffer with the pKo of the acid and the concentration of the conjugate base A- and the monoprotic acid HA. In cq. (1), pH-_ log[H+], pK, =-log Ka, and [J]i and [JIe are the initial and equilibrium molar concentration of the Jth species, respectively. The buffering capacity of the buffer is given by [1] Ka H+ where K,e-1.0 ×...
Please answer within 40 minutes for when the question
is due, thank you!
|-/0.5 points GVSUCHEM116V2 14.6.3.P004. My Notes Calculating the pH of a Buffer Solution To prepare a buffer you weigh out 9.00 grams of KNO2 and place it into a 500.00 mL volumetric flask. To this flask you add 18.0 mL of 3.80 M HNO, and then fill it about halfway with distilled water, swirling to dissolve the contents. Finally, the flask is filled the rest of the...
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...
Please help with the prelab questions! thank you!!!!
Especially 2 and 3!
Pre-Lab Questions 1. Calculate the theoretical equivalence point (the volume!) in terms of ml NaOH adde each of the titrations. Assume the concentration of acid is 0.81 M and the concentration of base is 0.51 M. 2. Which equation can be used to find the pH of a buffer? Calculate the pH of a buffer containing 0.20 M CH3COOH and 0.20 M CH3COONa. What is the pH after...
1 Review Constants Periodic Table You have to prepare a pH 5.07 buffer, and you have the following 0.10 M solutions available: HCOOH, HCOONa, CH, COOH, CH3COONa, HCN, and NaCN. Correct Part B How many milliliters of each solution would you use to make approximately a liter of the buffer? Express your answers using two significant figures. Enter your answers numerically separated by a comma. IVO AXO A O 2 ? Vch. cooh , Vch,cooNa = 333,667 Submit Previous Answers...
Most questions answered within 3 hours.
-
Match the scientist with the research, match letters with
number, only one scientist has more than...
asked 34 seconds ago -
A 13.0kg object is moving on a flat, horizontal surface. If the
coefficient of kinetic friction...
asked 14 seconds from now -
When an employer breaches an award or enterprise agreement, or
even the national employment standards, by...
asked 9 minutes ago -
How
many nitrogen atoms do you have if you have 35.5 g of N2O?
asked 6 minutes ago -
How does a higher average price level impact our demand for
foreign goods? How would this...
asked 11 minutes ago -
1, The following data represent the muzzle velocity (in feet
per second) of rounds fired from...
asked 12 minutes ago -
Apple currently trades at $422.
You can buy a 3-month put option on Apple stock with...
asked 13 minutes ago -
The best known theory of motivation is probably
McGregor Theories X and Y
TRUE OR FALSE
asked 26 minutes ago -
To the nearest hundredths, what is the pH at the end of an
enzyme-catalyzed reaction if...
asked 23 minutes ago -
2Cr2O3 + 3Si -> 4Cr + 3SiO2
The reaction is begun with 191g Si and 114...
asked 33 minutes ago -
Listed below are several fictional stars with their luminosities
and distances from Earth given. Rank the...
asked 31 minutes ago -
A couple have the following genotypes (for the ABO, Rh-factor
and Colour vision (XCB:normal vision,
Xcb:...
asked 38 minutes ago