Question 335050: Help would be greatly appreciated. Thank you.
A flask containing 300 ml of 90% nitrite solution tips over spilling part of its contents. This was subsequently replaced by an equal amount from a mixture of 30% nitrate. If an 80% solution resulted, how much was spilled?
Answer by nyc_function(2741)   (Show Source):
You can put this solution on YOUR website! If you spill out nitrite and replace it with nitrate, what is the 80% a solution of?
Let = the amount that was spilled
We start with 270 ml of some compound of nitrogen and oxygen in the flask. In the spill, we lose .9x ml of the compound. The replacement gets us back .3x ml of compound, and we have 240 ml of compound at the end.
270 - .9x + .3x = 240
270 - .6x = 240
.6x = 30
x = 50 ml)
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