4. you are preparing 250 ml of gel mix for protein electrophoresis, which requires a final concentration of 1.6% sds. the lab has a 10% stock solution of sds. how much sds stock solution (in ml) do you use? round your answer to the nearest whole number. (ch. 2.1)

40 mL

Explanation:

To prepare a solution by a concentrated solution, we must use the equation:

C1xV1 = C2xV2

Where C is the concentration, V the volume, 1 is the initial solution and 2 the final solution. So, the final volume will be 250 mL, with 1.6% of concentration:

10xV1 = 1.6x250

V1 = 40 mL

So, it's necessary 40 mL of the SDS stock solution.

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).