Answer:
0.053 L is the volume of concentrated solution that was used
Explanation:
Let's determine the answer of this, by rules of three.
There is also a dilution formula.
Molarity is a sort of concentration that indicates the moles of solute in 1L of solution.
In 1 L of concentrated solution, there are 1.5 moles of NaCl
In 1 L of diluted solution, there are 0.80 moles.
The volume for the diluted solution is 0.10L
The rule of three will be:
1L of solution has 0.80 moles of solute
Then, 0.10L of solution must have (0.1 . 0.8)/1 = 0.08 moles
This moles came from the concentrated solution, and we know that in 1L of this solution we have 1.5 moles. Therefore the rule of three will be:
1.5 moles are in 1L of solution
0.08 moles were in (0.08 . 1L / 1.5) = 0.053 L (This is the volume of concentrated solution that was used)
Dilution formula is: M conc . Vol conc = M diluted . Vol diluted
1.5 M . Vol conc = 0.80 M . 0.10L
Vol conc = 0.80 M . 0.10L / 1.5M = 0.053L
= 0.3571 L or 0.4 L