Clarification

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magaliolide1D
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Joined: Thu Jul 11, 2019 12:15 am

Clarification

Postby magaliolide1D » Thu Oct 03, 2019 5:57 pm

Do the moles of a solute change when being diluted at all, in any instance? If not, why?

Vivianvelazquez_1J
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Re: Clarification

Postby Vivianvelazquez_1J » Thu Oct 03, 2019 6:00 pm

When diluting a solution moles of solute remain the same:
n initial = n final
M initial V initial = M final V final

n = Moles of solute
V = Volume of solution
M = Molarity

Ami_Pant_4G
Posts: 106
Joined: Sat Aug 24, 2019 12:17 am

Re: Clarification

Postby Ami_Pant_4G » Thu Oct 03, 2019 6:03 pm

Moles of solute never change being diluted because volume is the only being changed to change the concentration of solution, which means the solvent is the only thing that is changing. Hope this helps!

ahuang
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Re: Clarification

Postby ahuang » Thu Oct 03, 2019 9:32 pm

Moles of solute do not change even when more solvent is added because there is no solute being added or removed. It is easier to think that when more solvent is added, it is being added to its surrounding so the solute and solvent are separate.

Trent Yamamoto 2J
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Joined: Sat Aug 17, 2019 12:18 am

Re: Clarification

Postby Trent Yamamoto 2J » Thu Oct 03, 2019 9:59 pm

Do the moles of a solute change when being diluted at all, in any instance? If not, why?

The moles of a solute never change when being diluted. Imagine you're making a cup of hot cocoa by pouring in a packet of cocoa mixture into a mug of water. Even if you added more water to the mug, the amount of cocoa you added doesn't increase. The same applies when diluting a solute- just because there's more volume being added doesn't mean there's more moles of a solute.

305421980
Posts: 101
Joined: Sat Sep 07, 2019 12:16 am

Re: Clarification

Postby 305421980 » Fri Oct 04, 2019 9:45 am

When you rearrange the Mol/V=Molarity equation to MV=mol, the equation is put in terms of moles. By setting the rearranged equation equal to the final MV amounts you are basically saying MV=mol=MV because they are both in terms on the same mole amount

Juana Abana 1G
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Joined: Wed Sep 18, 2019 12:15 am

Re: Clarification

Postby Juana Abana 1G » Fri Oct 04, 2019 6:38 pm

magaliolide1D wrote:Do the moles of a solute change when being diluted at all, in any instance? If not, why?


Yes I was confused on this as well.

Lauren Stack 1C
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Joined: Sat Aug 17, 2019 12:18 am

Re: Clarification

Postby Lauren Stack 1C » Fri Oct 04, 2019 10:26 pm

The moles of solute remain the same, regardless of the dilution. There is a set number of molecules of the solute in a solution. Even if more solvent is added, the number of molecules of solute will not change, as there is no solute being added or removed. There is simply more solvent being added, which does not contain any amount of solute. Thus, the moles of solute before the dilution = the moles of solute after the dilution.


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