SOLUTION: In order to obtain 800ml of a 2.5% lidocaine lotion. How much water must be used to dilute how much of a 10% lidocaine lotion? (Hint: water is 0% lidocaine lotion.)

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Question 1129260: In order to obtain 800ml of a 2.5% lidocaine lotion. How much water must be used to dilute how much of a 10% lidocaine lotion? (Hint: water is 0% lidocaine lotion.)
Found 2 solutions by josgarithmetic, stanbon:
Answer by josgarithmetic(39627) About Me  (Show Source):
You can put this solution on YOUR website!
x ml of 10% lidocaine
800-x ml of water

10x%2B0%28800-x%29=2.5%2A800
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10x=2.5%2A800
x=2.5%2A80
x=200

200 ml. of 10% lidocaine and 600 ml. of water

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
In order to obtain 800ml of a 2.5% lidocaine lotion. How much water must be used to dilute how much of a 10% lidocaine lotion? (Hint: water is 0% lidocaine lotion.)
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Equation:
lid + lid = lid
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10% lid + water = 2.5% lid.
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0.1x + 0*(800-x) = 0.025*800
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100x + 0 = 25*800
x = 200 ml (amt. of 10% lidocaine to dilute)
800-x = 600 ml (amt. of water used to dilute)
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Cheers,
Stan H.
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