SOLUTION: A laboratory technician prepares 200 mL of 35% ethyl alcohol from a 95% ethyl alcohol stock solution.
Determine, to the nearest mL, the amount of 95% ethyl alcohol that is neede
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Determine, to the nearest mL, the amount of 95% ethyl alcohol that is neede
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Question 515871: A laboratory technician prepares 200 mL of 35% ethyl alcohol from a 95% ethyl alcohol stock solution.
Determine, to the nearest mL, the amount of 95% ethyl alcohol that is needed.
Determine, to the nearest mL, the amount of distilled water that is added. Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! Let = ml of 95% alcohol needed
Let = ml of water needed
given:
(1) ml
(2)
----------------------
(2)
(2)
(2)
(2)
(2)
and,
(1)
By substitution:
(2)
(2)
(2)
(2)
and
(1)
(1)
(1)
74 ml of 95% alcohol are needed
126 ml of water are needed
check answer:
(2)
(2)
(2)
(2)
close enough
