Step 2: Phosphate buffer Monobasic (mM) Dibasic (mM) pH 50 5.37 40 10 6.08 30 20 6.48 20 30 6.83 10 40 7.31 50 8.58 Determine the likely ratio of mono:di phosphate for a solution whose pH = ~7.0

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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Experiment #2
Step 1: Calculate amount of Sodium phosphate monobasic is required to make 100ml of 0.5M solution
mass (g)
5.9 g
0.5M*0.1L=0.05 119.98 g/mol * 0.05 moles = 5.999
pH at RT (250C)
3.75 Ka = 6.16 x 10^-8 = x^2/0.5, -log (x) = 3.75
Step 2: Phosphate buffer
Monobasic (mM)
Dibasic (mM)
pH
50
5.37
40
10
6.08
30
20
6.48
20
30
6.83
10
40
7.31
50
8.58
Determine the likely ratio of mono:di phosphate for a solution whose pH = ~7.0
%3D
Transcribed Image Text:Experiment #2 Step 1: Calculate amount of Sodium phosphate monobasic is required to make 100ml of 0.5M solution mass (g) 5.9 g 0.5M*0.1L=0.05 119.98 g/mol * 0.05 moles = 5.999 pH at RT (250C) 3.75 Ka = 6.16 x 10^-8 = x^2/0.5, -log (x) = 3.75 Step 2: Phosphate buffer Monobasic (mM) Dibasic (mM) pH 50 5.37 40 10 6.08 30 20 6.48 20 30 6.83 10 40 7.31 50 8.58 Determine the likely ratio of mono:di phosphate for a solution whose pH = ~7.0 %3D
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