1. Air in the stopcock or buret tip.
2. Parallax errors: This type of error occurs when the scale of the buret is not viewed from a perpendicular position. Looking down on the meniscus causes it to appear higher than where it really is. Looking up at the meniscus causes it to appear lower than it really is.
3. Delivering the liquid too rapidly, so that drops form on the side of the buret.
4. Not reading the buret properly or to the correct number of decimal places.
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