Question

How can percent error be reduced?

Answer 1

Percent error can be reduced by improving both your accuracy and precision.

Try your best to eliminate variables that may cause fluctuations in your experiment such as:
-Temperature differences
-Rate you add chemicals
-Time mixing
-Exposure to air if it affects concentration
-Inaccurate measurements
-etc.

% error= `|Actual - Experimental|/|Experimental|*100`