Question

1)Dilute a solution that has an intial concentration of alcohol of 14.5% down to 3%.

2) Dilute a solution that has an intial concentration of 0.05% to 0.001%.
     

Answer 1

1)Dilute a solution that has an intial concentration of alcohol of 14.5% down to 3%.

Initial conc = 14.5 % so it contains 14.5 ml in 100mL of solution

on we wish to make 3% of solution from it

then 14.5 X x V mL = 100mL X 3

so vmL = 20.6mL

so take 20.6mL of 14.5% of solution and dilute it with water to make up the solution upto 100mL

2) Dilute a solution that has an intial concentration of 0.05% to 0.001%.

0.05 X VmL = 0.001X 100

VmL = 2mL so take 2mL of above solution and dilute it upto 100mL with water to make 0.001% of solution