Question

How many milligrams of salt must be added to 18 milligrams of a 20% salt solution to obtain a 35% salt solution? Round to the nearest tenth.

Answer 1

20 % = mass salt x 100/ 18
mass salt = 20 x 18/100=3.6 mg
35 = ( 3.6 + x) 100/ 18 + x
630 + 35 x = 360 + 100 x
270 = 65 x
x =4.2 g

Answer 2

ughh thank you so muchh

Answer 3

No problem :)