Nominal Amount of Aspirin/tablet (mg) 325 STANDARD ASA SOLUTION Mass of ASA (mg)

Question

Nominal Amount of Aspirin/tablet (mg) 325 STANDARD ASA SOLUTION Mass of ASA (mg) Concentration of standard ASA 403.3 1.61 Volume of Standard (mL) ASA] (mg/L) Abs 0.000 0.100 0.200 0.300 0.400 0.500 0.000 0.004 0.008 0.022 0.059 0.032 0.00621118 0.000 16.1 32.2 48.3 64.4 80.5 slope R 2 intercept 0.003380952 Aspirin Tablets Aspirin Tablet Mass Abs ASA] in unknown (mgLASA/Tablet (mg) %Aspirin (m/m) 0.3737 0.3713 0.3841 0.021 0.049 0.014 3.925333333 8.43333333 2.798333333 Average St Dev DoF 95% Confidence limit 95%confidence interval Absolute Error (mg)

Explanation / Answer

We will plot the data for the known concentration of aspirin in water against absrobance

Intercept = 0.0036

The mass of aspirin tablet and aborbance can be averaged as

Mass of aspirin in the tablet can be calculated by putting the values of absrobance in the above equation

y = 0.0006x -0.0036

0.028 = 0.0006 x - 0.0036

x = 52.67mg

So % of aspirin = Mass of aspirin X 100 / total mass of tablet = 0.05267 X 100 / 0.3763 = 13.99 %

aspirin table absrobance 0.3737 0.021 0.3713 0.049 0.3841 0.014 avg 0.3763 0.028

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