Conclusion
However, once we withdrawn the pipette out of the flask, the liquid level drops significantly. We have to be very careful that the solution level remains near the flask mouth when discharging solutions into the flask. Ways of improvement We may try using 50cm3 solutions during the titration instead of 100cm3 because it could still show a significant change in sodium thiosulphate used. Also, it could allow us to have few more chances to repeat the titration process using the same flask of solution. As a result, we could obtain the experiment result by taking the average result from titration. It could improve the accuracy of the experiment. Next time, when conducting the experiment, we should examine the water sample immediately after it's collected to avoid the oxygen content inside it being affected by the surrounding air. Conclusion The oxygen content inside the water sample is 18.92 mg dm-3 ?? ?? ?? ?? ...read more.