Calculate pH and buffer capacity of a buffer solution composed from 0.025 M sodium bicarbonate (NaHCO3 ) and 0.00125 M carbonic acid (H2CO3) at 25 °C (Ka1 = 4.31×10-7).
Answer:
Carbonic acid has two dissociation constants. The first one produces bicarbonate and hydronium ion as described in the following chemical formula:
Using the buffer equation, pH can be calculated as the following (pKa1= 6.37):
The buffer capacity, β, is calculated as the following:
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Answer:
Carbonic acid has two dissociation constants. The first one produces bicarbonate and hydronium ion as described in the following chemical formula:
H2CO3 + H2O ↔ HCO3- + H3O+
Using the buffer equation, pH can be calculated as the following (pKa1= 6.37):
The buffer capacity, β, is calculated as the following:
pH=7.67
[H3O+]=10-pH=2.14×10-8
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