chem qst..

[lacoste]

Calculate the molarity of CaCl2 in 25mL of 0.40M CaCl2 added to 50mL of 1.2M CaCl2?

cheers.

[Collin Li]

This is a quite basic question. If you couldn't get the right answer, the common traps are:

* Molarity is a unit for concentration (moles per litre), so you are finding the concentration
* Remember to use the final volume as the sum of the two volumes you added together
* There is no reaction happening! Some teachers always say "write down the equation first," but sometimes there is simply no reaction. Visualise the process, and you will realise it's just a simple mixing of two solutions of the same thing. This results in... the same thing (different concentration possibly though).

Solution

[lacoste]

thank-you for the quick reply !!

genius!

hope u dont mind more qsts coming..

[Collin Li]

thank-you for the quick reply !!

genius!

hope u dont mind more qsts coming..

No problem. Nope, I don't mind. I just edited in some comments above, just to sort of commentate my thoughts on the question.

[lacoste]

12). Calculate the molaar concentration present in the following solutions:
a). 1.55L of solution, which contains 1.223g of CaCl2?

d). 20.0 L of solution, containing 4.07x10^-3 mol of KF

[lacoste]

yeh i think they are basic qsts but i missed a few lessons of chem at school

[/0]

12.
a)

d)