Topic 2 - Formulas + Accuracy & Precision

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Last updated 8:50 AM on 6/2/26
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10 Terms

1
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what is the formula for %w/w?

weight of component in g / weight of sample in g x 100%

2
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what is the formula for %w/v?

weight of component in g / volume of sample in ml x 100%

3
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what is the for v/v%

volume of component in ml / volume of sample in ml x 100%

4
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ppm =?

mg/L

5
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what is accuracy?

the degree of agreement between the measured value and the accepted true value

6
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what is the formula for absolute error?

E = |Xm - Xt|

7
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what is the formula for % error / relative error?

Er = (Xm - Xt / Xt) x100%

8
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what is precision?

the degree of agreement between replicate measurements of the same quantity?

9
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what is the formula for relative standard deviation (RSD)?

%RSD = stdev/mean x 100%

10
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how to find precision?

stdev/RSD