Mixing+Two+Solutions+and+Making+Dilute+Solutions

Mixing Two Solutions Having Different Concentrations of the Same Chemical

In chemistry, a solution is a homogeneos mixture that contains solute and sovent. After we mix two solutions which have different concentrations of the same chemical, we get a new solution of this chemical with a different concentration. The concentration of the final solution lies between the original concentrations.

Example : P102-81 What's the molar concentration of the HNO3 solution resulting from 5.0mL of 3.5M HNO3 and 95mL of 0.20M HNO3? Solution: [HNO3]dil(#1)= 3.5M x 5.0mL/100mL= 0.18M [HNO3]dil(#2)=0.20M x 95mL/100mL= 0.19M [HNO3](total)=0.18+0.19=0.37M So, the molar concentration of the HNO3 solution resulting from mixing HNO3 solutions is 0.37M.

Well, in this example, the molar concentration of the final solution is 0.37M, and the original two solutions have concenttrations 3.5M and 0.20M. The quantity relationship of them is 0.20M<0.37M<3.5M, which means that the mixture's concentration is between the two original ones. As for how big the concentration is, it depends on the specific concentration of the two original solutions.



Making Dilute Solution From Concentrated Solutions
==In the solution that we dilute from an original solution, the moles of chemical are the same before and after. The difference is on the concentration.According to the relationship between the concentration and the volume, we get the equation. ==

Cconc x Vconc = Cdil x Vdil
== In this equation, we can calculate any one if we know the other three ones.Cconc represents the concentration of the original solution while Vconc is the volume of the original solution. Cdil is the concentration of the dilute solution and Vdil is the volume of the dilute solution. ==