January 27, 2021, 05:20:43 AM
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91
Organic Chemistry Forum for Graduate Students and Professionals / Re: Oxycodone synthesis
« Last post by Borek on January 23, 2021, 04:06:38 AM »
write out the synthesis in detail

I am afraid discussing practicalities of the synthesis will be against our forum rules. No problems with discussing reaction mechanism though.
92
Comments for Staff and Comments from Staff / MOVED: LPG Merox treatment unit
« Last post by Borek on January 23, 2021, 04:03:49 AM »
93
Organic Chemistry Forum / Re: Halogenation of a carboxylic acid using SO2Cl2
« Last post by rolnor on January 23, 2021, 03:45:27 AM »
Wildfyr,I can be wrong, I dont have any reference to support this, its more from experience.
94
High School Chemistry Forum / Re: K constant equation
« Last post by Meter on January 22, 2021, 09:27:22 PM »
Contrary to what is taught in high school, the equilibrium constant K (and likewise the reaction quotient Q) are unitless. It is implicitly understood that all of the concentrations [A], [D] ... etc. are all divided by something called the "standard concentration" which is equal to exactly 1 M. This cancels out all units you would get from [A], [D] ... etc. and thus K (and Q) are unitless.

And this isn't some trivial formality, either! Certain equations involve that K or Q place them inside logarithms, and units inside logarithms is undefined. An example of such an equation is $$\Delta G^o = -RT\ln{K}$$ So in short, you don't need to worry about units at all, and as you mentioned, only reactants/products in the gaseous (g) or aqueous (aq) phase are accounted for in the mass action equation.

Regardless, if you have a factor with identical units in both the numerator and denominator, they would cancel out either way.
95
Organic Chemistry Forum for Graduate Students and Professionals / Oxycodone synthesis
« Last post by Zeon37 on January 22, 2021, 07:44:38 PM »
Hi everyone! For one of my chem assignments we have to take a compound and write out the synthesis in detail and explain verbally a breakdown of each step.
I chose one of the semi-synthetic opioids—oxycodone—. I’m really confused on what to do following hydrogenation. It’s says to wash with water and dry over sodium sulfate in vacuo. Please help me!!
96
Organic Chemistry Forum / Re: Halogenation of a carboxylic acid using SO2Cl2
« Last post by wildfyr on January 22, 2021, 05:24:42 PM »
Hm... I think i've used those conditions for SO3Na --->SO2Cl
97
Biochemistry and Chemical Biology Forum / Can michaelis menton equation determine IC50
« Last post by distheho on January 22, 2021, 04:31:24 PM »
If I plot the % reduced (from uninhibited reaction) enzyme reaction rate vs inhibitor concentration, is the "Km" the IC50 for that specific enzyme concentration?
98
High School Chemistry Forum / K constant equation
« Last post by Bob shapnal on January 22, 2021, 01:19:19 PM »
When you have the constant equation with the part which is a fraction of the products conc. over the reactants conc. That you use [A] ... [D] for, I know you don't include the concentration of water if that is one of your products or reactants, as it's concentration change, is negligible.

So you leave it out because it would be multiplied by 1 anyway. But I always don't bother multiplying or dividing by 1000 for the question as fractions don't need to be. However, when water is cancelled out do you have to keep original units because it would mess up the answer?
99
Materials and Nanochemistry forum / Re: Phone glass and diamond abrasion
« Last post by billnotgatez on January 22, 2021, 12:49:30 PM »
... Does using a glass every day mean that millions of quartz atoms end up in my body?

As an aside - I am betting we all eat sand as a result of it being in our food in small amounts.
100
Generic Discussion / Re: The terms "give snacks" and " take snacks"
« Last post by billnotgatez on January 22, 2021, 12:31:50 PM »
Sometimes members will take snack from someone who violates forum rules.
Sometimes members give snacks when they gain insight from another member.

Snacks do not cause any direct change in a members participation status.
It is a way of showing pleasure or displeasure with another member without clogging up the forum with unnecessary fighting.

I have never taken a snack ..yet

One can find other posts about    snack    by using the search feature of the forum.

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