Question

What size volumetric flask would you use to create 1.50 M solution using 43.85 g of NaCl?

Answer 1

The size of volumetric flask is 0.5L = 500mL

Explanation:

In order to estimate the concentration of a solution in molarity, then the total number of moles of the solute is divided by the total volume of the solution.

Molarity of a solution is given by;

$M= \frac{n}{V}$

Where;

n= number of moles of solute

V= volume of solution = size of volumetric flask

$n=\frac{m }{ m.m}$

Where;

m= mass of solute=43.85g

m.m= molar mass of solute=58.5g

Note that solute is NaCl(s)

$n=\frac{43.85}{58.5}=0.75mol$

We know that the molarity is 1.50M

To find the size of the volumetric flask, we make V in M=n/V subject of formula

$V=\frac{n}{M}$

$V=\frac{0.75}{1.50}$

$V=0.5$

Therefore, the size of volumetric flask is 0.5L = 500mL.