The molar concentration of nitrate ions in the resulting solution is 0.20M.
Molar concentration, also known as molarity, quantity concentration, or substance concentration, is a unit used to describe the amount of a substance in a solution expressed as a percentage of its volume. The number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry. One mol/L of a solution's concentration is referred to as one molar, or 1 M.
Now let us come to our problem statement;
Nitrate from NaNO₃:
75.0 mL × 0.20 M = 15 mmol NaNO₃ = 15 mmol NO₃⁻
Nitrate from Ba(NO₃)₂:
25.0 mL × 0.10 M = 2.5 mmol Ba(NO₃)₂
2.5 mmol Ba(NO₃)₂ × [tex]\frac{2mmol NO3}{1mmol Ba(NO3)2}[/tex] = 5.0 mmol NO₃⁻
So the final number of NO₃⁻ moles is (15 + 5) 20 mmol.
The final volume is (75 + 25) 100 mL.
So the molar concentration is:
20 mmol / 100 mL = 0.20 M
The molar concentration of nitrate ions in the resulting solution is 0.20M.
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