Question

George wishes to increase the percent of acid in 50ml of a 15% acid solution in water to 25% acid, how much pure acid must he add

Answer 1

Answer:

DJ ALOK

Step-by-step explanation:

amount times concentration=quantity

50(0.15)+x(1)=(50+x)(0.25)

x=amount of acid to add

so

7.5+x=12.5+0.25x

minus 0.25x both sides

7.5+0.75x=12.5

minus 7.5 both sides

0.75x=5

divide both sides by 0.75

x=6.666666666

converts to 6 and 2/3

you have to add 6 and 2/3ml of pure acid

Answer 2

Answer: 6 2/3

Step-by-step explanation: go to algebra.com