SOLUTION: we wish to obtain a 40% solution of nitric acid by mixing a 20% solution and a 70% solution of the acid. what percentages of the final solution should be taken from the 20% and 70%

Question 211083: we wish to obtain a 40% solution of nitric acid by mixing a 20% solution and a 70% solution of the acid. what percentages of the final solution should be taken from the 20% and 70% solutions?
thanks for the help
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
we wish to obtain a 40% solution of nitric acid by mixing a 20% solution and a 70% solution of the acid.
what percentages of the final solution should be taken from the 20% and 70% solutions
:
It does not give the amt of final solution to be made.
Assume it is 100 units, easy to change amt to per cent.
:
Let x = amt of 70% solution used
then
(100-x) = amt of 20% solution
:
A typical mixture equation;
.7x + .2(100 - x) = .4(100)
.7x + 20 - .2x = 40
.7x - .2x = 40 - 20
.5x = 20
x =
x = 40 units of 70% solution
and
100 - 40 = 60 units of 20% solution
:
We can say we will take 40% from the 70% solution
and take 60% from the 20% solution
RELATED QUESTIONS
An acid mixture is made by mixing 40% and 70% acid solution. How much of each should be... (answered by mananth)

Twenty liters of a 20% acid solution is obtained by mixing 30% acid solution and a 5%... (answered by jorel1380)

two acid solution are available to a chemist. one is a 10% nitric acid solution and the... (answered by Fombitz)

how much of an 80% nitric acid solution must be added to a 125gram solution of 10% nitric (answered by stanbon)

how much of an 80% nitric acid solution must be added to a 125gram solution of 10% nitric (answered by richwmiller)

an experiment requires mixing a 40% acid solution with a 70% avid solution to create 150... (answered by solver91311)

How many gallons of a 60% solution of nitric acid should be added to 10 gallons of a 30%... (answered by josgarithmetic)

an acid solution was made by mixing 1L of a 40% acid solution and 4L of a 70% solution.... (answered by stanbon)

A chemist wants to make 250 ml of 30% acid solution by mixing a 20% acid solution with a (answered by checkley77)