Finding the volume of stock solution to dilute

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Katie Frei 1L
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Joined: Fri Sep 28, 2018 12:27 am

Finding the volume of stock solution to dilute

Postby Katie Frei 1L » Mon Oct 08, 2018 8:43 pm

Does anyone know if when solving for an initial volume using the formula M(inital)V(inital) = M(final)V(final), would I have to convert the final volume originally given in mL to liters? In other words, when is it necessary to convert mL to liters? Thanks!

ChathuriGunasekera1D
Posts: 78
Joined: Fri Sep 28, 2018 12:17 am

Re: Finding the volume of stock solution to dilute

Postby ChathuriGunasekera1D » Mon Oct 08, 2018 8:46 pm

Hi! I don't think it really matters, but I tend to convert to liters if the value exceeds the thousands place. So I would convert 3,000 ml to 3 L just to keep it shorter. I think a TA said that it doesn't matter for the test!

charlotte_jacobs_4I
Posts: 63
Joined: Fri Sep 28, 2018 12:29 am

Re: Finding the volume of stock solution to dilute

Postby charlotte_jacobs_4I » Tue Oct 09, 2018 10:09 am

Hello! I'm don't think it is completely necessary to convert your answers to mL from Liters, but I usually do since there are sometimes other steps to the problem where you are subtracting a volume from a greater volume and in this case they would both need to have matching units.

Rehan Chinoy 1K
Posts: 67
Joined: Fri Sep 28, 2018 12:25 am

Re: Finding the volume of stock solution to dilute

Postby Rehan Chinoy 1K » Tue Oct 09, 2018 10:48 am

I don't think it matters, I just prefer to keep it in liters because molarity of a solution is moles/liters. But for the M1V1 equation, since you are essentially finding a value using a ratio, whether you choose mL or L does not matter as long as you are consistent and that you specify.

AlyssaBei_1F
Posts: 99
Joined: Fri Sep 28, 2018 12:17 am

Re: Finding the volume of stock solution to dilute

Postby AlyssaBei_1F » Tue Oct 09, 2018 3:07 pm

It does not matter if you use mL or L, but you have to stay consistent throughout the whole problem. I usually just change to liters.

Hailey Boehm 2H
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Joined: Fri Sep 28, 2018 12:24 am

Re: Finding the volume of stock solution to dilute

Postby Hailey Boehm 2H » Tue Oct 09, 2018 4:57 pm

I prefer to convert mL to L because Molarity is moles/L, as mentioned above. It is only necessary to convert from mL to L if the problem specifically asks for liters or vice versa. Mr. Lavelle usually specifies in the question, so be sure to always to aware of units in your final answer. Hope this helps.

Tinisha 1G
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Joined: Fri Sep 28, 2018 12:17 am

Re: Finding the volume of stock solution to dilute

Postby Tinisha 1G » Tue Oct 09, 2018 5:12 pm

I would suggest always converting to Liters because molarity is moles/liters and the units always have to be consistent!

Manya Kidambi 3I
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Joined: Fri Sep 28, 2018 12:24 am

Re: Finding the volume of stock solution to dilute

Postby Manya Kidambi 3I » Wed Oct 10, 2018 10:07 am

Unless the problem specifically states that you need to keep the answer in L or convert it to mL, I wouldn't worry about it. However, since Molarity = moles/liters, it's a good idea to convert in the beginning itself.

EllaBerry
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Joined: Fri Sep 28, 2018 12:29 am

Re: Finding the volume of stock solution to dilute

Postby EllaBerry » Thu Oct 11, 2018 10:11 am

Like everyone else said, it isn't necessarily required. However, if you ever want to use that volume to find molarity or moles, you would need to convert it into L, so I would say that it is usually best to do so at the beginning of a problem regardless.

305115396
Posts: 30
Joined: Fri Sep 28, 2018 12:16 am

Re: Finding the volume of stock solution to dilute

Postby 305115396 » Thu Oct 11, 2018 12:09 pm

It doesn't matter but make sure that if you are using mL you are using mL for both Vinitial and Vfinal. The reason it doesn't matter whether it is mL or L it is the same ratio.

Marwan Masri 3B
Posts: 31
Joined: Fri Sep 28, 2018 12:23 am

Re: Finding the volume of stock solution to dilute

Postby Marwan Masri 3B » Thu Oct 11, 2018 12:10 pm

You can use either L or mL as long as you are consistent with the units throughout your calculations.

Shibhon_Shepard
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Joined: Wed Nov 15, 2017 3:04 am

Re: Finding the volume of stock solution to dilute

Postby Shibhon_Shepard » Fri Oct 12, 2018 1:37 pm

The standard one for this equation is Liters, but if asked otherwise, you should probably use liters for your volume.

705022748
Posts: 26
Joined: Fri Sep 28, 2018 12:25 am

Re: Finding the volume of stock solution to dilute

Postby 705022748 » Thu Nov 15, 2018 9:32 pm

L or mL is fine, just make sure to have matching units all throughout. It wouldn't hurt to change it at the beginning, since molarity is moles/L.

gabbymaraziti
Posts: 20
Joined: Wed Sep 18, 2019 12:19 am

Re: Finding the volume of stock solution to dilute

Postby gabbymaraziti » Sun Sep 29, 2019 4:46 pm

I'd recommend converting to L before you start your calculations, because the formula for finding molarity is [moles of solute (M)]/[volume of solution (L)]. Either way, you'll have to convert to L before finalizing your answer.


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