Continue adding 3.0 M NaOH, in 5 drop increments, measuring the pH after each in

Question

Continue adding 3.0 M NaOH, in 5 drop increments, measuring the pH after each increment, until you have added a total of 30 drops of 3.0 M NaOH. Buffer capacity is defined (for the purposes of this laboratory) as the number of drops of either 3.0 M HCl or 3.0 M NaOH that can be added before it exceed the buffer range. Test tube Series A; Measure the pH of the solution after each consecutive addition of 5 drops of 3.0 M HCl. Identify the test tubes from Series A that demonstrated the largest buffer capacity: _____ Test tube Series B; Measure the pH of the solution after each consecutive addition of 5 drops of 3.0 M NaOH.

Explanation / Answer

Buffer capacity : the amount to which a buffer resist any pH change by addition of a strong acid or a strong base to the buffer solution

f) The test tube that shows largest buffer capacity (maximum resistance to pH change) would be = 5

g) Acid buffer capacity : Is the resistance of the buffer solution to the added base. The greater is the resistance the higher is the acid buffer capacity of the solution.

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