How much pure water must be mixed with 9 pints of 70% developer to produce the mixture he needs?
Lola18 asked:
Nick DiGregorio is developing film in his darkroom when he realizes he does not have the proper developer. He needs a mixture that is 20% developer, but he only has a mixture that is 70% developer. How much pure water must be mixed with 9 pints of 70% developer to produce the mixture he needs? Round your answer to the nearest hundredth when necessary.
Nick DiGregorio is developing film in his darkroom when he realizes he does not have the proper developer. He needs a mixture that is 20% developer, but he only has a mixture that is 70% developer. How much pure water must be mixed with 9 pints of 70% developer to produce the mixture he needs? Round your answer to the nearest hundredth when necessary.
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Posted: March 5th, 2009 under Uncategorized.
Tags: Developer, Digregorio, Pints
Comment from David B
Time March 8, 2009 at 12:34 pm
the standard diluton equation applies here.
C1V1 = C2V2
C1 is 70%, V1 is 9 pints, C2 is 20%
The total final volume, V2 = C1V1/C2
The total amount of water to be added is V2 - V1