Final answer:
To make a 3 liter of 1.2M KBr solution from concentrate KBr(6M), you should use 0.6 liters of the concentrated KBr.
Step-by-step explanation:
To make a 3 liter of 1.2M KBr solution from concentrate KBr(6M), you can use the formula:
concentration1 x volume1 = concentration2 x volume2
where concentration1 is the concentration of the concentrated solution, volume1 is the volume of the concentrated solution that you're using, concentration2 is 1.2M, and volume2 is 3 liters.
So, in this case, the equation would be: 6M x volume1 = 1.2M x 3L
Simplifying the equation, you get:
volume1 = (1.2M x 3L) / 6M = 0.6L
Therefore, you should use 0.6 liters of the concentrated KBr to make the 3 liter 1.2M KBr solution.