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drawing tangents to find rate of reaction. how to draw tangents accurately? watch

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    E.g. tangents of graphs for conc vs time .Questions that ask for this scare the hell out of me because I can't get them right 4/5 times. When I draw it the line touches the point...but tilting the ruler in a range will still allow the the line to touch the point and no other part of the graph so I just try to choose an inbetween position in this 'range' 4/5 times the answer is wrong(when I use it to calculate gradient).

    Has anyone faced this problem? Have any advice? Thanks - frustrated chemistry student.
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    You have to draw the tangent at that particular point and the tangent has to have the same gradient as the curve at that point. So try and draw the line with the same gradient as the curve at that point.
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    Tilting the ruler is only going to give you the tangent at a different point along the curve. There will only be one way that you can draw it such that it crosses it at that specific point.

 
 
 
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Updated: March 15, 2016
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