150 ml of 30% sulphuric acid was added to approximate 400 ml of 12% sulphuric acid solution. Find the approximate concentration W of the acid in the mixture?
Choose the correct choice from the following choices
A) 1/2 B) 1/3 C) 1/4 D) 1/6 E) 1/5
Do not need any computation   30%-----------21%---------12%   if volume of both sol. were equal the concentration W would be 21%=1/5, but 12% is more than 3 times   only possibility is 1/6   1/6
<result>D</result>
150 ml of 30% sulphuric acid was added to approximate 400 ml of 12% sulphuric acid solution. Find the approximate concentration W of the acid in the mixture?