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A 50 ml solution that is 10% acid will consist of 5 ml of acid (10% of the volume) and 45 ml of water (90% of the volume). You're not adding any water, but you want to add enough acid to make a solution that is 50% acid and 50% water. You will need to have a total of 45 ml of acid in the mixture to make it a 50/50 solution, since the amount of water is also 45 ml. You have 5 ml in there already, so you would need to add 40 ml of acid. That would make a total 90 ml solution that is 50% water (45 ml) and 50% acid (45 ml).

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Q: How much pure acid should be added to 50 ml of a 10 percent acid solution to give a 50 percent acid solution?
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How much pure acid should be mixed with 5 gallons of 70 percent acid solution in order to get a 90 percent acid solution?

x=45


How much pure acid should be mixed with 6 gallons of a 50 percent acid solution in order to get an 80 percent acid solution?

50% acid in a 6 gallon solution means that 3 gallons are acid. 9 gallons more acid will give you a total of 12 gallons of acid in a 15 gallon solution. 12 is 80% of 15.


How much pure acid should be mixed with 5 gallons of a 20 percent acid solution to get a 50 percent acid solution?

x = amount of acid to add. y = final volume. 5 gal + x = y original amount of acid + acid added = final amount of acid (5 X .2) + x = O.5y Subtract the second equation from the first one. 5 - 1 + x - x = y - 0.5y 4 = 0.5y 8 = y Therefore the final volume is 8 gallons. 5 gal + x = 8 x = 3 gal. the amount of pure acid to add. Check the answer 5 X .2 = 1 gal of acid in original solution. 3 gallons added = 4 gallons total acid in solution. 4 gallons total acid in final solution of 8 gallons total solution = 50% acid.


Is it possible to mix a 10 percent acid solution and a 40 percent acid solution to obtain a 60 percent acid solution?

No. The reulting concentration (percent) must be between the two components. So, with the two acids you are mixing, you cannot get an acid that is less than 10% or more than 40%


How many liters of a 90 percent acid solution must be mixed with a 15 percent acid solution to get 600 L of a 80 percent solution?

Mixing 80 liters of 15% solution and 520 liters of 90% solution will give 600 liters of 80% solution.

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