### Solutions to Henderson-Hasselbalch problems 4, 5, 6

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Three example problems of buffer calculations with a base and its salt

As a reminder, here is the Henderson-Hasselbalch Equation:

The K_{a} for anisic acid is 3.38 x 10¯^{5}; the pK_{a} equals 4.471.

**Problem #4:**

pH = 4.471 + log (1.00 / 1.00)
pH = 4.471

**Problem #5:**

pH = 4.471 + log (0.800 / 0.600)
pH = 4.471 + 0.125 = 4.596

**Problem #6:**

pH = 4.471 + log (0.300 / 0.700)
pH = 4.471 - 0.368 = 4.103

A Henderson- Hasselbalch calculator. Have fun!

Below the calculator is a list of acids and bases with their pK_{a} values. Please note that pK_{b} values are not given for bases. What is given is the pK_{a} value for the conjugate acid to the base.

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