Question

You want to make 50 ml of 1X tricaine solution in order to euthanize some fish. How much of a 20X tricaine stock solution will you need to dilute in order to make your solution?a. 1 ml b. 5 ml c. 0.4 ml d. 10 ml e. 2.5 ml

Answer 1

Answer: e. 2.5 ml

Explanation:

According to the dilution law,

$C_1V_1=C_2V_2$

where,

$C_1$ = concentration of stock solution = 20X

$V_1$ = volume of stock solution = ?

$C_2$ = concentration of required solution= 1X

$V_2$ = volume of  required solution= 50 ml

$20\times V_1=1\times 50ml$

$V_2=2.5ml$

Thus 2.5 ml much of a 20X tricaine stock solution is needed to dilute in order to make your solution.