Question

For a behavior experiment, you want to test the effect of injected GABA. How much of a 2x10-4 M GABA solution do you have to inject into a 60 g crayfish to reach a concentration of 10-5 M in the hemolymph of the crayfish?

Answer 1

It is given that:

Initial concentration of solution (C_i) = 2×10^-4 M

Final concentration of the solution (C_f) = 10^-5 M

Since, 1 g = 1 mL

Thus, 60 g = 60 mL

Therefor, final volume of the solution (V_f) = 60 mL

Now, the final volume of the solution will be calculated as follows:

Therefore, 3 mL GABA solution should be injected to reach the desired concentration.