Question

What NaCl concentration results when 309 ml of a 0.690 m NaCl solution is mixed with 467 ml of a 0.330 m NaCl solution?

Answer 1

Answer:

The resulting NaCl solution  has a concentration of 0.4732 M

Explanation:

Concentration is the ratio of  amount of solute present  in a solution to  the amount of  solvent or total solution. Morality  is the commonly used unit of concentration.

$Concentration=\frac{(\text{Moles of solute})}{(\text{Volume of solution})}$

Since we are given with same NaCl solution, we have

$\frac{(M_1 V_1+M_2 V_2)}{(V_1+V_2 ) }$....................(1)

Where  

$M_1= 0.690 m$

$V_1= 309 ml$

$M_2= 0.330 m$

$V_2= 467 ml$

Now substituting the values in equation in (1)

=>$\frac{( (0.690\times 309 )+(0.330\times 467))}{(309+467) }$

=>$\frac{ (213.21\times 154.11)}{776}$

=>$\frac{367.32}{776}$

=>0.4732 M