QQuestionChemistry
QuestionChemistry
"How do you calculate the ppm and molarity of a diluted standard solution of Fe²⁺ when starting with a stock solution that is 40 ppm in Fe²⁺?
a) What is the formula to calculate ppm in a diluted standard solution?
b) How can you determine the molarity of a solution from its ppm value?"
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Answer
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Step 1
- $V_{diluted}$ is the volume of the diluted solution
To calculate the ppm (parts per million) of a diluted standard solution, you can use the formula: where:
Step 2
- $V [L]$ is the volume of the solution
To determine the molarity of a solution from its ppm value, first convert the ppm to mass (m) using the following formula: where: Next, calculate the molarity (M) using the formula: where:
Final Answer
- The formula to calculate ppm in a diluted standard solution is ppm_{diluted} = ppm_{stock} imes \frac{V_{stock}}{V_{diluted}} - The molarity of a solution can be determined from its ppm value using the following steps: a) Convert ppm to mass (m) using the formula m [g] = \frac{ppm [\%] imes M_{solute} [g/mol] imes V [L]}{10^6} b) Calculate the molarity (M) using the formula M = \frac{m [g]}{V [L]}
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