Discussion
A solution giving an absorbance of 0.60 is diluted to one third of its concentration. Its absorbance becomes
Answer: C
Correct answer: 0.20
Absorbance is proportional to concentration, so diluting to one third divides it by three:
\[ \frac{0.60}{3} = 0.20 \]This linearity is the whole basis of quantitative absorption spectrometry, and it is why absorbance rather than transmittance is the quantity plotted - transmittance would have gone from 25 to 63 per cent, which is not proportional to anything.
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