Solve the problem.
-In a chemistry class, 4 liters of a 4% silver iodide solution must be mixed with a 10% solution to get a 6% solution. How many liters of the 10% solution are needed?
A) 2.0 L
B) 3.0 L
C) 1.0 L
D) 4.0 L

Question

Quizplus · Accepted Answer

The problem can be solved using the equation for mixture: (amount of substance in first solution + amount of substance in second solution) / (total volume of solution) = desired concentration. For the 4% solution: 4 liters * 4% = 0.16 liters of silver iodide. Let x be the liters of the 10% solution needed, so x * 10% = 0.1x liters of silver iodide. The total volume of the solution will be 4 + x liters, and we want a 6% silver iodide solution: (0.16 + 0.1x) / (4 + x) = 6%. Solving for x gives x = 2 liters.

Solve the Problem. -In a Chemistry Class, 4 Liters of a 4% Silver