SOLUTION: A chemist has a 100 mL beaker of a 30% solution.
a. Write an equation for the concentration of the solution after adding x mL of pure water.
b. Use that equation to determine
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a. Write an equation for the concentration of the solution after adding x mL of pure water.
b. Use that equation to determine
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Question 803320: A chemist has a 100 mL beaker of a 30% solution.
a. Write an equation for the concentration of the solution after adding x mL of pure water.
b. Use that equation to determine how many mL of water should be added to obtain a 7% solution. Round your answer to 1 decimal place. Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! A chemist has a 100 mL beaker of a 30% solution.
a. Write an equation for the concentration of the solution after adding x mL of pure water.
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Equation:
active + active = active
0.30*100 + 0*x = c(100+x)
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b. Use that equation to determine how many mL of water should be added to obtain a 7% solution. Round your answer to 1 decimal place.
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30*100 + 0*x = 0.07(100 + x)
30*100 + 0 = 7*100 + 7x
7x = 21*100
x = 300 mL (amt of water to add)
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Cheers,
Stan H.
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