500ml of a 0.2M BOH (a weak base) is mixed with 500ml of 0.1M HCL. pH ...
Understanding the Buffer Solution
When 500 ml of 0.2M BOH (weak base) is mixed with 500 ml of 0.1M HCl, a buffer solution is formed. The pH of this buffer is given as 9. A buffer consists of a weak acid and its conjugate base or a weak base and its conjugate acid, which helps maintain pH.
Calculating the pH of 0.1M BCl Solution
To find the pH of a 0.1M BCl solution (the conjugate acid of BOH), we can use the relationship between pH and pKa.
- Buffer Solution Components:
- BOH (weak base) reacts with HCl to form BCl (conjugate acid).
- pH and pKa Relationship:
- The pH of the buffer solution (9) can be related to the pKa of the weak base BOH using the Henderson-Hasselbalch equation.
- Dissociation of BCl:
- BCl, being a conjugate acid, will dissociate in water, releasing H+ ions, which will affect the pH.
Estimating pH of 0.1M BCl
- Approximate pKa Value:
- Given that the pH of the buffer solution is 9, we can infer that the pKa of BOH is close to this value.
- Calculating pH of BCl:
- Since BCl is a weak acid, its pH can be estimated to be lower than the pH of the buffer due to its dissociation.
- Final pH Value:
- For a 0.1M solution of BCl, the pH can be approximated around 5-6, considering typical weak acid behavior.
Conclusion
In conclusion, the pH of a 0.1M BCl solution is expected to be in the range of 5 to 6, reflecting the weak acid nature of BCl when in solution.
500ml of a 0.2M BOH (a weak base) is mixed with 500ml of 0.1M HCL. pH ...
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