Explanation:
C1 = initial concentration of HNO3 solution (in this case, 15.0 M15.0M)
V1 = initial volume of HNO3 solution (in this case, 20.0 mL20.0mL)
C2 = final concentration of the diluted solution
V2 = final volume of the diluted solution (in this case, 20.0 mL+120.0 mL=140.0 mL20.0mL+120.0mL=140.0mL)
According to the principle of dilution, C1×V1=C2×V2.
Substituting the given values, we get: 15.0 M×20.0 mL=C2×140.0mL
Now, solve for C2: 15.0 M×20.0 mL = C2x140.0mL
C2≈2.14M
So, the concentration of the diluted solution is approximately 2.14 M2.14M.
