When totally digested by acid and rocessed into a sample of one liter solution volume for spectroscopy, a 3.21 gram sample of alloy yeilded an absorbance of 0.288. Calculate the percent by wieght of iron in the alloy sample
To calculate the percent by weight of iron in the alloy sample, you will need to use the absorbance value obtained from spectroscopy and apply a calibration curve.
Here are the steps to follow:
1. Prepare a calibration curve: Start by preparing a set of standard solutions with known concentrations of iron. For example, you can create solutions with iron concentrations of 0.1 g/L, 0.2 g/L, 0.3 g/L, and so on. Measure the absorbance of each standard solution using the same spectroscopy method.
2. Plot the calibration curve: On a graph, plot the iron concentrations (x-axis) against the corresponding absorbance values (y-axis). Use a best-fit line or curve to represent the relationship between iron concentration and absorbance.
3. Determine the concentration of iron in the alloy sample: Using the given absorbance value of 0.288 for the alloy sample, locate this value on the calibration curve. From the corresponding iron concentration on the x-axis, determine the concentration of iron in the alloy sample.
4. Calculate the weight of iron in the alloy sample: Now that you know the concentration of iron in the alloy sample, you can calculate the weight of iron in the 1 L solution volume. Multiply the concentration by the volume (1 L) to get the weight of iron in grams.
5. Calculate the percent by weight of iron: Finally, divide the weight of iron by the initial weight of the alloy sample (3.21 grams) and multiply by 100 to get the percent by weight of iron in the alloy sample.
Note: The calibration curve is essential for accurately determining the concentration of iron in the alloy sample. Make sure to use reliable standard solutions and measure the absorbance accurately for each concentration.