molarity and molality !

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molarity and molality !

Chemistry
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See there your question is given like: 2g of a Substance is added to water... Can you tell me what is solute here and what is the solvent here ??
solvent is water and solute is that 2g substance .. correct ?
Yes..

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For finding molarity you need number of moles solute.. How will you find number of moles of solute because it is given in 2 grams.. ??
i dont know !
For that there is a formula you will use that..
ah .. that previous one ?
derived from molarity .. ?
\[Number \; Of \; Moles = \frac{Grams \; Present}{Molecular \; Mass \; Of \; that \; Substance}\]
No no that one.. This one I have written above now..
how many formulas are there in this chapter ?
Now let us try to implement this formula on a question so that you can understand it properly. There are as many formulas as there are hairs on your head.. Ha ha ha..
what if am bald ?? :P
Wait for one second my mummy is calling me.. Have a look on that formula and try to memorize it and understand it as well..
okay !
Then there are as many formulas as there are hairs on my head And I don't like to be bald..
am not bald either .. i were just kidding :)
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Mention me when you will come.. I am in Mathematics Section..
yeah back !
I have to go ashna...
So let us hurry up I can explain you this thing..
okay
See you are given with question like this: 2g of a NaCl is dissolved in 4 L of water.. Find the Molarity..
Hurry up find the molecular mass of NaCl first..
Because you have to find Number of Moles first..
23+35.5 ?
Yep...
so it is 58.5..
58.5
Now 2g you are given with.. Can you find number of moles now ??
2 / 58.5
Yep solve it hurry up..
0.034...
Yep..
Now can you find molarity by using its formula ??
For that you need volume of solution too..
0.034 / 4
For that you need volume of solution too..
No..
then ?
I don't know.. Ha ha ha..
Yes we can ashna..
okay .. you leave then !
For that you should know the density of water.. It will be given to you.. I think approximately density of water is 1.. So: \[Density = \frac{Mass}{Volume}\]
Oh god what I am doing.. We have to find volume of NaCl not water..
you better leave water ..
Yeah but I will explain you after coming for sure.. May be till then others may help you.. Or I think I have written the question wrong...
hm..
But the main concept is you got how to find number of moles of solute when it is not given.. Right ??
yes
It did increase some knowledge of yours. Okay now I have to leave.. There is work for me from my neighborers.. So I have to go now..
hm.. bye
Bye take care as well..

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