Doreen Schmidt is a chemist. She needs to prepare 36 ouncesounces of a 16% hydrochloric acid solution. Find the amount of 18% solution and the amount of 9% solution she should mix to get this solution

Question

Doreen Schmidt is a chemist. She needs to prepare 36 ouncesounces of a 16​% hydrochloric acid solution. Find the amount of 18​% solution and the amount of 9% solution she should mix to get this solution

missykea · Answer

please help!

helpwithk12 · Answer

oreen Schmidt is a chemist. she needs to prepare 32 ounces of a 10% hydrochloric acid solution. find the amount of 16% solution and the mount of 8% solution she should mix to get this solution. 
I have no idea what I am doing. This is the equation I have so far. 
16x+1024-32x=320

missykea · Answer

im stuck and this is my last one for the night can you help

helpwithk12 · Answer

yes

helpwithk12 · Answer

Let x = amount of 16% solution
then
32-x = amount of 8% solution
.
Equation: 
.16x + .08(32-x) = .10(32)

helpwithk12 · Answer

Do you got any answers

helpwithk12 · Answer

hello

amedel · Answer

Hey if you want you could probably try to solve this one using a system of equations. Let A be the number of ounces of the 18% solution and B be the number of ounces of the 9% solution;  what two facts involving A and B do we know to be true when we combine them?

missykea · Answer

im still stuck

amedel · Answer

Well we know that when we combine the two solutions their mass together will be 36 ounces right? 

So:  A + B = 36

amedel · Answer

Additionally, if we mix it perfectly:

0.18 * A + 0.9 * B = 0.1 * 36

missykea · Answer

im still stuck

amedel · Answer

Does seeing the second equation help any?

umerlodhi · Answer

They're correct!