## Molarity unit [ENDORSED]

Daniel Rivas 3L
Posts: 32
Joined: Fri Sep 29, 2017 7:07 am

### Molarity unit

So I was working on a lot of molarity questions recently and I was wondering. does Molarity always have the unit of mol/L? Or can it sometimes equal mol/ml if you keep it the same? or is it a different unit altogether? I'm just a little confused about it.

Nishma Chakraborty 1J
Posts: 51
Joined: Fri Sep 29, 2017 7:04 am

### Re: Molarity unit  [ENDORSED]

Hey! From by best understanding (and from what my teachers have done in the past), molarity has always been in the standard mol/L. Whenever a volume is given in ml, I convert it to L. Hope that helps!

Kevin Liu 3G
Posts: 28
Joined: Fri Sep 29, 2017 7:07 am

### Re: Molarity unit

Yes, it is best to never do mol/ml because the formula always uses mol/L and it is the more accepted version. Besides, you wouldn't want the grade to mistakenly think that you wrote 13 L instead of 13 ml.

Ruohan Sun 3I
Posts: 19
Joined: Fri Sep 29, 2017 7:07 am

### Re: Molarity unit

The mostly used unit M is mol/L, but you can also use other units such as mol/mL

SitharaMenon2B
Posts: 50
Joined: Thu Jul 27, 2017 3:01 am

### Re: Molarity unit

Molarity as an SI unit is usually defined by moles per liter so I would say you probably should not use moles per mL

StephanieRusnak
Posts: 19
Joined: Fri Sep 29, 2017 7:07 am

### Re: Molarity unit

I would say always use mol/L for molarity, even if in certain calculations the L will cancel, I think its best to show your understanding of the definition of molarity.

804899546
Posts: 51
Joined: Sat Jul 22, 2017 3:00 am

### Re: Molarity unit

What is the difference between molarity and molality?

Jesus Rodriguez 1J
Posts: 53
Joined: Sat Jul 22, 2017 3:00 am

### Re: Molarity unit

The standard units for molarity are mol/L so I would suggest using those units. If a problem for some reason asks you for Molarity in terms of mol/ml you can always convert the Liters.

Gobinder Pandher 3J
Posts: 21
Joined: Fri Sep 29, 2017 7:07 am

### Re: Molarity unit

Molarity is defined as the moles of solute per liter of solution. I don't think you'll ever see molarity as moles/mL. I hope this helps.

Samira Tootla 1J
Posts: 3
Joined: Fri Sep 29, 2017 7:04 am

### Re: Molarity unit

Molarity is the number of moles of solutes per liter of solution, whereas molality is the number of moles of solute per kilogram of solvent. Molarity's SI unit is mol/liter and molality's SI unit is mol/kg. Hope that answered the questions above.

Samira Tootla 1J
Posts: 3
Joined: Fri Sep 29, 2017 7:04 am

### Re: Molarity unit

Molarity is the number of moles of solutes per liter of solution, whereas molality is the number of moles of solute per kilogram of solvent. Molarity's SI unit is mol/liter and molality's SI unit is mol/kg. Hope that answered the questions above.

Amelia Georgius 1K
Posts: 25
Joined: Fri Sep 29, 2017 7:05 am
Been upvoted: 1 time

### Re: Molarity unit

It is usually easiest to convert all of your units to SI units at the beginning of a problem so that you are less likely to make an error in the calculation and answer, which in this case the SI unit is mol/L.

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