Final answer:
The percent error can be calculated using the given formula when the actual and experimental values are known.
Step-by-step explanation:
The actual concentration of the HCl is given as 0.33M. The percent error can be calculated using the formula:
Percent Error = [(Actual Value - Experimental Value) / Actual Value] x 100%
In this case, the experimental value is the concentration of HCl that was found through the titration. Let's assume the concentration found through the titration is X M. The percent error can then be calculated as:
Percent Error = [(0.33 - X) / 0.33] x 100%
This formula can be used to find the percent error when the actual and experimental values are known.