Question

What volume of 10 molar hcl and 3 molar hcl should be mixed to get 1 litre of 6 molar hcl solution?

Answer 1

Answer:

Suppose that the volume of 10M HCl (V1) = x L

So, Volume of 3M HCl to make 1l 3m hcl (V2)(1-x) L

Let us take M1 = 10M and M2 = 3M, 

We know that, Molarity of a mixture equation : (M1V1 + M2V2) / (V1 + V2) = M3 

[10x + 3(1-x)] / 1 = 6

10x - 3x  + 3 = 6 

7x =  3 

x = 3 / 7 = 0.43

Therefore, Volume of 10M HCl = 0.43L and Volume of 3 M HCl = 1-0.43 = 0.57 L