Magna *** Laude Build

[ultimate157 5,000+ posts]

No silly, not what molarity is, what molarity 30% concentration of HCl is //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Haha read it too quickly. //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

 

[baseballer1100 5,000+ posts]

What the **** is going on????????????

 

[96civ 10+ year member]

No silly, not what molarity is, what molarity 30% concentration of HCl

It depends on what 30% means. Is that 30 % mass or 30 % volume? I'm pretty sure it would have to be mass since anhydrous HCl is usually a gas.

 

[PV Audio 5,000+ posts]

It says its molarity somewhere on it, not it's molality, so I'm sure it's volume.

 

[96civ 10+ year member]

That's still deceiving. I'm betting that it's mass since you cannot have HCl(liquid) at Standard Temperature and Pressure (STP). You'd have to greatly increase the pressure, or greatly decrease the temperature to do so. Here's my logic:

30% by mass = .3g HCl / 1g H2O

MW of HCl = 36.46g

.3g HCl * (1 mol / 36.46g) = .00823 mol HCl

Molarity = mol solute / liter solvent

1g H2O = 1mL H2O (density is 1g/mL)

Thus

Molarity = .00823 mol HCl / 1 mL H2O ; but molarity is mol solute/L solvent so.. by a slight conversion factor (multiply by 1000)

8.23M HCl solution at 30% concentration by mass.

That seems pretty possible since we work with 16M sulfuric and nitric acids at Butler, and they start fuming at that concentration. 8.23M can definitely do some damage.

On a side note, using molarity vs molality to determine whether or not the % concentration is by mass or volume isn't the best method. Almost all concentrations will be in molarity since the only reason why you would need to use molality is analyzing freezing point depressions and boiling point elevations when you add salts to a solvent (for instance, the reason for salting the roads in Indiana, is to decrease the freezing point. Doing so allows the water on the road to become colder before freezing, and stops ice creation). By using molality (where you have only masses, no volumes) you allow the calculation to become temperature independent, since we all know density depends on temperature.

Here's a trick question. How badly would it hurt to pour 100% (by mass) HCl on your hand?

 

[ballstothewall 10+ year member]

We worked with 10mol HCl in chem 2 lab the other year, thats about all I have to offer...

 

[DidUHearThat? 10+ year member]

Here's a trick question. How badly would it hurt to pour 100% (by mass) HCl on your hand?

Just a guess that it wouldn't, since it's a lighter than air gas and would rise and evaporate? Might burn your eyes/lungs though.

 

[96civ 10+ year member]

Just a guess that it wouldn't, since it's a lighter than air gas and would rise and evaporate? Might burn your eyes/lungs though.

Pretty much, yeah, your mucous membranes would be affected since they are typically damp and the HCl would "dissolve" in the fluid that coats the membranes. Without water, HCl is pretty much harmless to humans.

 

[PV Audio 5,000+ posts]

Y'all are such nerds. Coming from an EE student, that's bad //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

 

[PV Audio 5,000+ posts]

Just a guess that it wouldn't, since it's a lighter than air gas and would rise and evaporate? Might burn your eyes/lungs though.

Who's that bloke in your avatar?

 

[DidUHearThat? 10+ year member]

Who's that bloke in your avatar?

General Ripper... Base commander from Dr. Strangelove

"Must preserve the purity and essence of our precious bodily fluids"

 

[PV Audio 5,000+ posts]

We worked with 10mol HCl in chem 2 lab the other year, thats about all I have to offer...

I just looked at it, it is 10M.

 

[baseballer1100 5,000+ posts]

Im gonna start this shit now. Wish me luck.

 

[connersdad19 10+ year member]

gl

 

[96civ 10+ year member]

I just looked at it, it is 10M

It's 36.4% concentration then.

Good luck with the x-overs man... shouldn't be hard at all.