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Please help I have no idea what this wants me to do :(
Make 250 mL of a 2.570 M solution of CoCl2. Dilute the solution from the first part to make 150 mL of a ___ M solution. How many mL of the first solution do you need?

Sagot :

saya

Answer:

4.283M

Explanation:

Hi!

We are given a certain amount of CoCl2, and we are asked to make a smaller portion of it but with a stronger concentration. Dilution is a process where we use this equation: [tex]M_1V_1=M_2V_2[/tex] to find the unknown variable.

Think of it this way:

You put a powdered water flavor enhancer into your bottle. You put 5 drops of it, but it evenly distributes around the bottle so it tastes fine.

Now, you put it in a very small, miniscule cup. You have only a certain amount of water and 5 drops of water, but the flavor is so strong since there is less of the water. This is known as the concentration. Volume is just the water+flavor booster.

Let's convert everything to liters since the volume should be in units of liters.

250mL=0.250L

0.150mL=0.150L

Now, let's plug it in. The first two numbers go in the left side of the equation, and we do not know the concentration of the second so we will substitute a variable.

0.250(2.570)=x(0.150)    Isolate X.

4.283=x

x=molarity of the solution

The second question asks how many mL of the first solution would you need....since the relationship of MV should be consistent, it should be all of the solution needed.

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