bryan wanted to increase the concentration of a liter of hydrochloric acid from 30% to 35%. How much pure acid should he add

Question

anonymous · Answer

Is there a quantity it begins with?

anonymous · Answer

nope

anonymous · Answer

it says a liter of hydrochloric acid

anonymous · Answer

Oh okay

anonymous · Answer

how much pure acid should he add

anonymous · Answer

idk the only way to get from 30 to 35 would be to add 5%

anonymous · Answer

Start with a table

anonymous · Answer

thats all i would think u would have to create a chart

anonymous · Answer

yea i did a table but its not makin since

amistre64 · Answer

system of equations

amistre64 · Answer

let h = 1 liter, and n be the amount to add in

h+n = (1+n)

.30h + 1n = .35(1+n)

amistre64 · Answer

something similar to that

anonymous · Answer

Starting solution 

Total Amount: 1 liter
%HCL acid: 30
Total Amount of HCL acid: .3 liter

Solution Added: x liter 
%HCL acid : 100
Total amount of HCL acid: 1x

Resulting Solution: 1+x
%HCL acid: 35
Total amount of HCL: .35(1+x)

.35(1+x)= x+.3

amistre64 · Answer

seems we concur

anonymous · Answer

Yeah @amistre64 then just solve for x and plug it into the table

amistre64 · Answer

x is the solution :)

anonymous · Answer

its 5%

amistre64 · Answer

more like about .077 liters

amistre64 · Answer

not sure how you would add 5% pure acid as a solution

anonymous · Answer

I think she's thinking a 30 % solution + 5% soultion  would equal a 35% solution  when Mixture problems work differently

anonymous · Answer

yea lol

amistre64 · Answer

1liter at 30%  +  .077 liters at 100% = 1.077 liters at 35%

anonymous · Answer

The quantity of the starting solution has to be acknowledged which is in this case a liter

anonymous · Answer

The chemist is adding pure HCL which is .77 liters at 100% to make a 30 percent solution equal 35 percent

amistre64 · Answer

http://www.wolframalpha.com/input/?i=.30+%2B+n+%3D+.35%281%2Bn%29 .077 is what im getting, so im assuming a typo

anonymous · Answer

lol theirs no typo

anonymous · Answer

Yeah lol I didn't solve it I was just parroting your answer. @cali16 Lol he was talking to me.

anonymous · Answer

Yeah it's .077

amistre64 · Answer

good luck yall ;)

anonymous · Answer

But do you get it @cali16

anonymous · Answer

yes now i do thx!!!

anonymous · Answer

No problem.