Multiple choice

Equal volumes of $0.1M$ $AgNO_3$ and $0.2M$ $NaCl$ are mixed. The concentration of $NO_3{^-}$ ion in the mixture will be:

  1. $0.1M$
  2. $0.05M$
  3. $0.2M$
  4. $0.15M$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mixing equal volumes doubles the total volume, halving the concentration of each component. Initial [AgNO3] = 0.1M, [NaCl] = 0.2M. After mixing, [AgNO3] becomes 0.05M and [NaCl] becomes 0.1M. Since NO3- comes only from AgNO3, its concentration is 0.05M.

AI explanation

Let the equal volume of each solution be V. The initial moles of NO3- are 0.1V. When the two solutions are mixed, the total volume becomes 2V. The final concentration is the moles divided by the total volume, so 0.1V / 2V equals 0.05 M.

Keep practicing — related questions