Chemistry: How to Solve Titration Questions

Strong Acid + Strong Base Titration

1. Convert concentrations to number of moles
2. Subtract the smaller n from the larger n
3. Calculate -log (difference÷total volume)
4. If the larger n is of the acid, the result is the pH. Otherwise, it's the pOH.

Weak Acid+ Strong Base Tritation

If there's more weak acid than strong base:

1. Subtract the two n's.
   • C _{conjugate base} = n _{strong base} ÷ total volume
   • C _{weak acid} = difference ÷ total volume
2. Using the ICE table and the ka, calculate the new concentration of H+
3. pH=-log (H+)

If there's an equal amount of acid and base

1. C _{conjugate base}= n _{strong base} ÷ total volume
2. k_b = k_w ÷ k_a
3. [OH-] = square root of (k_b* C_{conjugate base})
4. pH = 14 + log [OH-]

If there's more strong base than weak acid

1. Find the difference between the two n's
2. Divide the difference by the total volume
3. pH = 14 + log [quotient]

Weak base+ Strong Acid Tritation
The steps are the same as those of Weak Acid+ Strong Base Tritation.