How Much Iron is in a 250ml Glass of Milo?

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SUMMARY

The discussion focuses on calculating the iron content in a 250ml glass of Milo using Atomic Absorption Spectroscopy (AAS). The concentration of iron in the diluted Milo is established at 2.57 ppm, leading to an undiluted concentration of 25.7 ppm. To determine the mass of iron consumed, participants suggest assuming the density of Milo is similar to water, allowing for straightforward calculations without the need for molar conversions. The key takeaway is that 1 ppm equates to 1 gram of iron per million grams of Milo, simplifying the mass calculation.

PREREQUISITES
  • Understanding of Atomic Absorption Spectroscopy (AAS)
  • Knowledge of concentration units, specifically parts per million (ppm)
  • Basic principles of density and mass-volume relationships
  • Familiarity with molar mass calculations, particularly for iron (Fe)
NEXT STEPS
  • Learn how to convert ppm to mol/L for various substances
  • Study the principles of Atomic Absorption Spectroscopy (AAS) in detail
  • Explore density calculations for different liquids and their implications in concentration measurements
  • Investigate the nutritional content analysis of beverages using standard laboratory techniques
USEFUL FOR

Chemistry students, food scientists, nutritionists, and anyone involved in beverage formulation and analysis will benefit from this discussion.

gordda
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I am having major trouble trying to figure the concentration of a substance that is given by the AAS. Here's the question:
To determine the iron content in a 'Milo' milk drink, a 5ml sample was diluted to 50ml. the absorption of the diluted solution and of several standard solution were measured using AAS.

What mass of iron would you consume by drinking 250ml glass of Milo?

It is given that the concentration of iron, in ppm, in the diluted milo is 2.57ppm hence the concentration of iron, in ppm, in the undiluted milo is 25.7ppm.

If anybody could work this out it would be greatly appreciated

Thanx:)
 
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V = 250 mL, C = 25.7 ppm - AAS doesn't mean anything here, you know the volume, you know the concetration, go ahead. The problem is that IMHO the formulation is stupid - ppm is mass of substance per mass of sample but mass of sample is not given. Assume density of water (1 g/mL).
 
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but i can't just use the formula n=cv because i need to change ppm into mol/L. and i have no idea how to do that? how do u change ppm into mol/L.
 
google: ppm concentration
 
gordda said:
but i can't just use the formula n=cv because i need to change ppm into mol/L. and i have no idea how to do that? how do u change ppm into mol/L.
Follow Borek's advice. Assume that milk has the density of water.

1 ppm means there's 1 gm of Fe in a million gms of milk. Convert the first number into moles (from the atomic wt of Fe) and the second into a volume (assuming the density as above), and you are done.
 
There is no need for any conversions! You are asked about mass of iron so you don't need molar concentration for anything.
 
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Borek said:
There is no need for any conversions! You are asked about mass of iron so you don't need molar concentration for anything.
Ummm...yes; didn't look carefully. Still need to convert volume of solution into a mass, but that's the only one.
 

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