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Introductory Chemistry: A Foundati...
Solutions
Introductory Chemistry: A Foundati...
ercise 15.2 What mass of water must be added to 425 g of formaldehyde to prepare a 40.0 (by mass) solution of formaldehyde? This solution, called formalin, is used to preserve biological specimens.
Interpretation:
The mass of water added in
Concept Introduction:
The mass percentage of a compound present in a solution is calculated by dividing the mass of the compound present in the mixture by the total mass of the solution and then multiplying it by
Where,
The mass of the formaldehyde is
The required mass percentage of the formaldehyde in the solution is
The mass percentage of a solute in an aqueous solution is given as:
Where,
Rearrange the above equation for the value of
Substitute the value of
Chapter 15 Solutions
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