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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: johnnyjohn993123 on March 19, 2016, 06:55:33 AM

Title: dilution facto help
Post by: johnnyjohn993123 on March 19, 2016, 06:55:33 AM

Im quite consfuse how his works.. dilution factor (Df)
Example
1. 10ml of sample was treatreated from 100ml sample. Is it (10/100)?
2. 10ml of sample was diluted to 100ml mark. And 5.00ml of this solution was treated. Whats the Df?

Title: Re: dilution facto help
Post by: Burner on March 20, 2016, 12:41:18 AM

For dilution,
$$ \mathrm{M}_1\mathrm{V}_1 = \mathrm{M}_2\mathrm{V}_2 $$

Where
M₁=Initial concentration
V₁=Initial volume
M₂=Final concentration
V₂=Final volume

Rearrangement of this equation gives
[tex] \mathrm{M}_2 = \mathrm{M}_1(\frac {\mathrm{V}_1}{\mathrm{V}_2}) [/tex]
Where [itex] \frac {\mathrm{V}_1}{\mathrm{V}_2} [/itex] is the dilution factor.

Quote from: johnnyjohn993123 on March 19, 2016, 06:55:33 AM

1. 10ml of sample was treatreated from 100ml sample. Is it (10/100)?
2. 10ml of sample was diluted to 100ml mark. And 5.00ml of this solution was treated. Whats the Df?

1 is unclear. Please explain 'treatreated from'.
2: Try to calculate yourself: You are given two volumes, 10mL and 100 mL. Which volume is the initial volume? Which one is the final volume? (Note that 5.00 mL is not related to the dilution, if I had not misread the question)

Edit: Adjusted some formats