Question

How many milliliters of water are needed to make a 0.171 M solution that contains 1.00 g of NaCl?

Answer 1

`100. mL`

Explanation:

You will be using the basic molarity equation, but first, we must convert the grams of `NaCl` to moles:

`1.00g NaCl((1 mol NaCl)/(58.44 g NaCl)) = 0.0171 mol NaCl`

Now, we'll use the molarity equation

`M = (mol solute)/(L soln)`

and solve for volume (`L`):

`L soln = (mol solute)/(M)`

and plug in known variables to find the volume

`L soln = (0.0171 mol)/(0.171(mol)/L) = 0.100 L`

Lastly, we'll convert from liters to milliliters:

`(0.100 L)(1000 mL)/(1 L) = 100. mL`