Question

100 ml of 1 M Hcl ,200ml of 2M Hcl and 300ml of 3M Hcl are mixed with enough water to get 1M solution. The volume of the solution is

Answer 1

total no of moles=0.1+0.4+0.9=1.4 (use formula for molarity to find no of moles)
now ,
1M=1.4/V (V is tot volume of solution)
there fore total volume =1400ml.

Answer 2

Answer:The volume of the solution is 14 mL.

Explanation

$moles=Molarity\times volume(L)$

Number of moles on 1 M HCL solution in 100 mL

$Moles=1 M\times 0.1 =0.1 mole$

Number of moles on 2 M HCL solution in 200 mL

$Moles=2 M\times 0.2 =0.2 mole$

Number of moles on 3 M HCL solution in 300 mL

$Moles=3 M\times 0.3 =0.9 mole$

On mixing all the solution with water to get 1 M solution HCl.

Total number of moles in resulting solution = 0.1 +0.4+ 0.9 = 1.4 moles

Volume of the resulting 1 M HCl solution = V

$1M=\frac{Moles}{\Volume(L)}$

$V(L)=\frac{1.4 moles}{1 mol/L}=1.4 L= 14 mL$

The volume of the solution is 14 mL.