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Systematic vs Random error

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Hi guys, 

I am struggling with the evaluation part of my Chemistry IA. I had an acid base titration as my experiment with HCl and NaOH. I had HCl in a conical flask and I was slowly adding NaOH with a burette. But sometimes I "overshooted" the NaOH, where I ended up pouring in too much NaOH than necessary. I was wondering if this is a random error or systematic error? 

I did get better with being more accurate with how much NaOH I added, so it's definitely not consistent how much I "overshooted". Thats why I thought it would be a random error, but idk anymore. 

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