a. How would you prepare a buffer with pH 3.00? Answer: mix 1.0 mol hydrofluoric acid with 0.71 mol sodium fluoride in 1...
a. How would you prepare a buffer with pH 3.00?
Answer: mix 1.0 mol hydrofluoric acid with 0.71 mol sodium fluoride
in 1.0 L water.
b. If you add 0.010 mol HCl to the buffer in 5a, calculate its pH.
Answer: pH = 2.99
c. If you add 0.010 mol HCl to 1.0 L water, what is the pH? Answer:
pH = 2.00
Homework Answers
Add Answer to:
a. How would you prepare a buffer with pH 3.00? Answer: mix 1.0 mol hydrofluoric acid with 0.71 mol sodium fluoride in 1...
A buffer contains 0.010 mol of lactic acid (pKa = 3.86) and 0.050 mol of sodium...
A buffer contains 0.010 mol of lactic acid (pKa = 3.86) and 0.050 mol of sodium lactate per liter. (a) Calculate the pH of the buffer. (b) Calculate the change in pH when 5.0 mL of 0.50 M HCl is added to 1.0 L of the buffer. (c) What pH change would you expect if you added the same quantity of HCl to 1.0 L of pure water?
4. Calculate the pH of a buffer solution made from 0.30 M hydrofluoric acid and 0.70...
4. Calculate the pH of a buffer solution made from 0.30 M hydrofluoric acid and 0.70 M sodium fluoride after the addition of 0.04 mol of HCl to 1 L of this solution. Assume no change in volume. K.-7.1x10+ 5. Calculate the pH of a 0.04 M HCl solution. Compare to the pH found in problem 4 Note: this is not a buffer! 6. What properties of a buffer solution provides for a solution with a higher capacity to withstand...
What is the pH of the buffer solution in question 2 (Recall the values were: 1.0...
What is the pH of the buffer solution in question 2 (Recall the values were: 1.0 L buffer of 0.35 M hydrofluoric acid (HF, Ka = 3.5x10-4) and 0.68 M sodium fluoride (NaF)) after 0.052 moles of HCl are added? The answer is NOT 2.65
You need to prepare 3.00 L of a 0.800 M buffer of pH 5.72. The reagents...
You need to prepare 3.00 L of a 0.800 M buffer of pH 5.72. The reagents that are available to use are listed in the table below. Sodium acetate (82.0 g/mol) Malonic acid (104.1 g/mol) Disodium succinate (162.1 g/mol) Disodium hydrogen citrate (236.1 g/mol) HCl (12.0 M) NaOH (10.0 M) Select one combination of these reagents to make your buffer. (1) Calculate how much of each reagent (and water) you will need to use to make this buffer. Show your...
1) A buffer solution contains 0.346 M hydrofluoric acid and 0.392 M sodium fluoride . If...
1) A buffer solution contains 0.346 M hydrofluoric acid and 0.392 M sodium fluoride . If 0.0239 moles of potassium hydroxide are added to 125 mL of this buffer, what is the pH of the resulting solution ? (Assume that the volume does not change upon adding potassium hydroxide. ) pH = _______ 2) A student needs to prepare a buffer made from HF and KF with pH 2.904. If Ka for HF is 7.2x10^-4, what ratio of [HF]/[F-] is...
Llulate sodium fluoride after the addition of 0.04 mol of HCl to 1 L. of this...
Llulate sodium fluoride after the addition of 0.04 mol of HCl to 1 L. of this solution. Assume no change in volume. K. 7.1*10 the pH of a buffer solution made from 0.30 M hydrofluoric acid and 0.70 5. Calculate the pH of a 0.04 M HCI solution. Compare to the pH found in problem 4 6. Consider the following weak acids and their K values: Acetic acid Phosphoric acid Hypochlorous acid K1.8 x 10-5 Ka 7.5 x 10-3 K...
A buffer contains 0.010 mol of lactic acid and 0.050 mol of sodium lactate per liter....
A buffer contains 0.010 mol of lactic acid and 0.050 mol of sodium lactate per liter. (a) calculate the pH of the buffer. (b) calculate the pH when 100ml of 0.02 M NaOH is added to 500mL of the buffer. (c) What pH would you expect if you added the same quantity of NaOH to 500mL of pure water?
A 500.0 mL buffer solution of 0.10 M hydrofluoric acid and 0.10 M potassium fluoride has...
A 500.0 mL buffer solution of 0.10 M hydrofluoric acid and 0.10 M potassium fluoride has an initial pH equal to 3.18 (this is the pH of the buffer solution before addition). What is the pH of the buffer solution after the addition of 0.010 moles of potassium hydroxide, KOH? Hint: Think about what is in the buffer before the addition and think about the starting molarities? What is significant about this and what value can you find from this...
You and your lab partner must prepare a 1.0 L buffer of formic acid at pH...
You and your lab partner must prepare a 1.0 L buffer of formic acid at pH 3.5. Your lab partner started the process and has already massed out 0.23 g of formic acid (MM 46 g/mol). How many moles of sodium formate do you need to complete this buffer. The pKa of formic acid is 3.75.
You are asked to prepare 500. mL of a 0.100 M acetate buffer at pH 5.00 using only pure acetic acid (MW=60.05 g/mol,...
You are asked to prepare 500. mL of a 0.100 M acetate buffer at pH 5.00 using only pure acetic acid (MW=60.05 g/mol, pKa=4.76), 3.00 M NaOH, and water. Answer the following questions regarding the preparation of the buffer. 1. How many grams of acetic acid will you need to prepare the 500 mL buffer? Note that the given concentration of acetate refers to the concentration of all acetate species in solution. 2. What volume of 3.00 M NaOH must...
4. Calculate the pH of a buffer solution made from 0.30 M hydrofluoric acid and 0.70 M sodium fluoride after the addition of 0.04 mol of HCl to 1 L of this solution. Assume no change in volume. K.-7.1x10+ 5. Calculate the pH of a 0.04 M HCl solution. Compare to the pH found in problem 4 Note: this is not a buffer! 6. What properties of a buffer solution provides for a solution with a higher capacity to withstand...
Llulate sodium fluoride after the addition of 0.04 mol of HCl to 1 L. of this solution. Assume no change in volume. K. 7.1*10 the pH of a buffer solution made from 0.30 M hydrofluoric acid and 0.70 5. Calculate the pH of a 0.04 M HCI solution. Compare to the pH found in problem 4 6. Consider the following weak acids and their K values: Acetic acid Phosphoric acid Hypochlorous acid K1.8 x 10-5 Ka 7.5 x 10-3 K...
Most questions answered within 3 hours.
-
In the Metric System, the basic unit of measurement for length
is ___
In the Metric...
asked 10 seconds ago -
A spatially uniform electric field varies in time according
to E = Eo + 3000 t,...
asked 28 seconds ago -
A sample of C3H8 has 1.60×1024 H atoms.
How many carbon atoms does the sample contain?...
asked 6 minutes ago -
Discuss the sales orders process module(s) in the Enterprise
Resource Planning system. How does it contribute...
asked 9 minutes ago -
The position in an object as a function of time is given as ?
(?) =...
asked 9 minutes ago -
Design a class for python named PersonData with the following
member variables:
lastName
firstName
address
city...
asked 23 minutes ago -
How does use of the risk/need/responsivity model impact
effective rehabilitation services?
asked 27 minutes ago -
Your rich uncle has just given you a high school graduation
present of $900,000. The present,...
asked 29 minutes ago -
1=Write a program in C to get 16-bit data from Port-D and send
it to ports...
asked 28 minutes ago -
Calculate Ecell for the following reaction and conditions: 0.50
M Br2 (aq), 0.10 M Pb+2 (aq),...
asked 49 minutes ago -
There can be more than one correct answer.
Hypophysiotropic hormones:
A. released by the hypothalamus
B....
asked 54 minutes ago -
Scott Ruskin is the CEO of Decatur Materials. The company has
been struggling for the last...
asked 52 minutes ago