SOLUTION: If I have a 80ml solution that is 20% acid by volume, how many mL should I remove and replace with pure 100% acid to obtain a final solution of 80ml that is 40% acid by volume? Wha

Question 620188: If I have a 80ml solution that is 20% acid by volume, how many mL should I remove and replace with pure 100% acid to obtain a final solution of 80ml that is 40% acid by volume? What is the equation?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
If I have a 80ml solution that is 20% acid by volume, how many mL should I remove and replace with pure 100% acid to obtain a final solution of 80ml that is 40% acid by volume? What is the equation?
-----
Equation:
acid - acid + acid = acid
0.20*80 - 0.20x + x = 0.40*80
---
Multiply thru by 100 to get:
20*80 - 20x + 100x = 40*80
80x = 20*80
x = 20 ml (amt. to remove and replace)
================
Cheers,
Stan H.
RELATED QUESTIONS
How many mL of a 20% acid should Paul mix with a 60% acid solution to make 100 mL of 50%... (answered by josmiceli)

A chemist has a 80mL of a 12% acid solution. How many mL of base must be added to get a... (answered by richwmiller)

How many ml of a 20% acid solution, and how many ml of 5% acid solution would I need to... (answered by addingup)

1)How many liters of pure acid must be added to 40 L of a 20% acid solution to make a... (answered by checkley77)

The mad scientists in a chemistry lab have 75ml of pure acid which must be diluted to a... (answered by ankor@dixie-net.com)

I have a quiz tomorrow and this is a problem on my homework, I could really use some... (answered by josgarithmetic,stanbon)

Suppose that x liters of pure acid (100% acid) are added to 280 liters of a 25% acid... (answered by jorel1380)

how many ml of 20% acid solution should be added to pure acid to obtain 40 ml of 45% acid (answered by josgarithmetic)

a chemist wants to make 50ml of a 16% acid solution by mixing a 13% acid solution and an... (answered by Alan3354)