December 01, 2020, 11:09:33 AM
Forum Rules: Read This Before Posting


Recent Posts

Pages: 1 ... 7 8 [9] 10
81
Organic Chemistry Forum / Re: How to remove 1-pentanol from 1-bromopentane?
« Last post by AWK on November 28, 2020, 06:55:24 PM »
If you get the condensate below 100°C and it separates into two layers with the organic phase floating on the water surface - this is pentanol. Bromopentanol has a density greater than that of water to keep it below the surface of the water. Without the rectification column, the condensate collected even below 100°C will contain traces of bromopentane which will be dissolved in the pentanol. I am rather sure that pentanol and bromopentane form an azeotrope and I expect boiling points of the order of 120-125°C.
Drying solutions containing alcohols with CaCl2 is pointless because alcohols form solvates with CaCl2 (probably with pentanol as well) and there will always be some water left in the dried preparation.
If you have a refractometer, distill a small amount of your preparation with the addition of water and check whether the refractive index of the last fraction increases.
82
Organic Chemistry Forum / Re: Coordination Number and Oxidation State
« Last post by AWK on November 28, 2020, 06:13:28 PM »
IUPAC English name for potassium hexacyanoferrate(II) is correct.
aquachlorobis(ethylenediamine)zinc(II) bromide
83
Organic Chemistry Forum / Re: Coordination Number and Oxidation State
« Last post by chenbeier on November 28, 2020, 05:07:54 PM »
Potassiumhexacyanidoferrat-II,
The others looks ok for me.
84
Organic Chemistry Forum / Coordination Number and Oxidation State
« Last post by Jutpinky on November 28, 2020, 04:57:07 PM »
Can someone see if they are any mistakes to the answers that I had written for my homework?
85
Chemical Engineering Forum / Re: Solid Copper Wire Oxidized By Cinnamic Acid
« Last post by metalmind on November 28, 2020, 04:19:04 PM »
I was outside, sorry!

I have a solid copper wire with a polyester mesh covering the solid copper wire. I am trying to create a formula for the polyester cinnamic reaction or the a reaction between the copper cinnamic acid.

I was looking at polyester fibers and chemistry and got a lot of information. Copper does react with an acidic acid, I have had lots of problems trying to prove how either of these reactions makes any sense from a chemical engineering or bonding perspective. Thanks everybody for glimpsing over this topic!
86
High School Chemistry Forum / Re: Storing chemicals at different temperatures
« Last post by Borek on November 28, 2020, 03:53:50 PM »
If they are stored properly (that is, not evaporating) they have the same temperature.
87
High School Chemistry Forum / Storing chemicals at different temperatures
« Last post by Curiousity on November 28, 2020, 12:30:58 PM »
Hi everyone,

I have a question, why is it that when hexane, pentanol, and isopropyl alcohol are stored at the same temperature, their temperatures when measured by a thermometer are different and more specifically, lower than room temperature?

I think it has something to do with their varying heat capacities, the fact that the sealed glass test tubes they were in were poor conductors of heat, or because of evaporation inside the test tube.

Guidance would be much appreciated!

Edit:
As well as this, would the same chemicals in an unsealed container ever become room temperature?

I said no because of the fact that they will be constantly evaporating.

88
Chemical Engineering Forum / Re: Solid Copper Wire Oxidized By Cinnamic Acid
« Last post by Borek on November 28, 2020, 12:03:40 PM »
What you wrote doesn't make much sense. Please elaborate.
89
Chemical Engineering Forum / Solid Copper Wire Oxidized By Cinnamic Acid
« Last post by metalmind on November 28, 2020, 11:24:47 AM »
I have a solid copper wire with a protective polyester mesh. The formation of CU(II) cinnamate reaction use copper carbonate.  Question? In light of limited reaction - How can one measure reactivity of Solid copper and Cinnamic Acid?
90
Organic Chemistry Forum / Re: Ranking organic chloride reactivity toward SN1
« Last post by yogurtspoon on November 28, 2020, 10:10:12 AM »
Okay, so I just realized I proved how awful I am at naming. Should've been chlorobenzene instead of benzyl chloride. Now rolnor's answer makes more sense, haha...
Pages: 1 ... 7 8 [9] 10