To prepare the buffer, a total volume of 500 mL is required. The stock solution of the weak base is available at 1 gallon with a concentration of 0.45 M. (Remember the lesson on dilution: C1V1=C2V2) 4. How many mL should be taken from the stock solution to prepare the desired buffer solution? (round off answer to 2 decimal places)

Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter17: Principles Of Chemical Reactivity: Other Aspects Of Aqueous Equilibria
Section17.2: Controlling Ph: Buffer Solutions
Problem 17.4CYU: Using an acetic acid/sodium acetate buffer solution, what ratio of conjugate base to acid will you...
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Using the table of the weak base below, you have chosen Pyridine as your weak base in the buffer solution. You have already added enough of the conjugate acid
salt to make the buffer solution concentration at 0.62 M in this salt. The desired pH of the buffer should be equal to 4.5.
Values of K, for Some Common Weak Bases
Conjugate
Acid
Name
Formula
K5
1.8 x 10-5
4.38 x 10-4
5.6 x 10-4
3.8 x 10-10
1.7 x 10-9
Ammonia
NH3
Methylamine
Ethylamine
Aniline
Pyridine
CH;NH2
CH;NH2
C,H;NH2
C;H;N
NH,*
CH;NH3*
CH;NH;*
CH;NH;*
C3H;NH*
Transcribed Image Text:Using the table of the weak base below, you have chosen Pyridine as your weak base in the buffer solution. You have already added enough of the conjugate acid salt to make the buffer solution concentration at 0.62 M in this salt. The desired pH of the buffer should be equal to 4.5. Values of K, for Some Common Weak Bases Conjugate Acid Name Formula K5 1.8 x 10-5 4.38 x 10-4 5.6 x 10-4 3.8 x 10-10 1.7 x 10-9 Ammonia NH3 Methylamine Ethylamine Aniline Pyridine CH;NH2 CH;NH2 C,H;NH2 C;H;N NH,* CH;NH3* CH;NH;* CH;NH;* C3H;NH*
To prepare the buffer, a total volume of 500 mL is required. The stock solution of the weak base is available at 1 gallon with a concentration of 0.45 M. (Remember the
lesson on dilution: C1V1=C2V2)
4. How many mL should be taken from the stock solution to prepare the desired buffer solution? (round off answer to 2 decimal places)
Transcribed Image Text:To prepare the buffer, a total volume of 500 mL is required. The stock solution of the weak base is available at 1 gallon with a concentration of 0.45 M. (Remember the lesson on dilution: C1V1=C2V2) 4. How many mL should be taken from the stock solution to prepare the desired buffer solution? (round off answer to 2 decimal places)
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