The observation that we made while we performed the experiment was that when water is added  to sodium polyacrylate it should have immediate reaction and absorb water at much faster rate but we saw that the process of absorption was slow and the factors that may have contributed in slow reaction was due to small quantity of Sodium polyacrylate used or the measurement was inaccurate that would have resulted our experiment result to go in the other way then what we expected to see the results, to absorb the water at a much faster rate. Another factor we may have to take in account that the scale is at zero before anything is placed, there is every chance of human error oversight to occur which may see the result not accurate. Another possibility is that during the weighing process of dry powder there is chance of spill over or blew away due to air conditioning on in the lab that can affect the overall results of true value and measured value. Other assumption we can make is that of the burette scale reading was incorrectly assumed due to wrong positioning that can lead your data to inaccurate and inconsistent. These kinds of errors can be reduced by using quality measuring devices and double checking and observing the recordings and measurements.

 To make this evaluation a bit clearer, 

Clearly explain the how the error occurred

Explain how the error would affect the data

Explain what you could do to reduce the effect of the error/improve the experiment