25.0 cm$^3$ samples of NaOH solution were taken by pipette from a beaker. These were then titrated with an aqueous solution of ethanoic acid. The concentration of ethanoic acid calculated from the experimental results was found to be lower than the actual value.
Which of these could explain the difference?
1 )
Rinsing the pipette with distilled water before filling with NaOH
Rinsing the burette with distilled water before filling with ethanoic acid
3 )
Rinsing the walls of the conical flask with distilled water during the titration
4 )
Rinsing the beaker with distilled water before filling with NaOH
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