pH of Polybasic acid buffers
pH of Polybasic acid buffers
pH of Polybasic acid buffers
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<strong>pH</strong> <strong>of</strong> <strong>Polybasic</strong> <strong>acid</strong> <strong>buffers</strong><br />
What if the mixture is not a 1:1 buffer?<br />
Example 5: Calculate the <strong>pH</strong> <strong>of</strong> a solution made up to be<br />
0.10 M in H 2 N(CH 2 ) 2 NH 3 Cl and 0.50 M in H 3 N(CH 2 ) 2 NH 3 Cl 2 .<br />
So, which <strong>of</strong> these reactions is relevant?<br />
H 2 N(CH 2 ) 2 NH 2 + H 2 O º H 2 N(CH 2 ) 2 NH 3 + + OH ! K b1 = 5.2 × 10 –4<br />
H 2 N(CH 2 ) 2 NH 3 + + H 2 O º H 3 N(CH 2 ) 2 NH 3 2+ + OH ! K b2 = 3.7 × 10 -7