Question

Amy needs to make 10 L of 42% sulphuric
acid solution. In the supply room, she
finds bottles of 30% sulphuric acid
solution and 60% sulphuric acid solution.
What volume of each solution should she
mix in order to make the 42% solution?
PLS HELP ME

Answer 1

The ratio of 30% to 60% she should mix is; 3:2

Ratio of mixing

From the task content;

Let the volume of 30% sulphuric acid

solution and 60% sulphuric acid solution to be mixed be x and y respectively.

Hence, it follows that;

• x + y = 10

• 0.3x + 0.6y = 4.2

By solving simultaneously, it follows that;

• x = 6L

• y = 4L.

Therefore, Ratio x/y = 6/4 = 3/2

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