# All Questions

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17 views

### Why frozen drink taste wierd after melting?

Not sure if this question related to Chemistry but here it is When you put a soft drink in the freezer (Pepsi) till it gets frozen then you keep it outside the fridge till it melts, the taste becomes ...
19 views

### Conversion of a compound to a racemic mixture of enantiomers

I am studying for the GRE Chemistry and came across this question. I was not sure how to proceed with it. The answer is A but I do not know why. It has been a little bit since Organic chemistry, but I ...
9 views

### experiment of UV assay of Dextromethorphan hydrobromide in a cough medicine [closed]

Hi there so I have the experiment in the title above and the first step was to make up two flasks of a 10 times dilution of the stock solution ( dextromethorphan hydrobromide) in 0.1m of sodium ...
15 views

### In crystallography, how does the real space R factor relate to the atomic B factor?

In assessing the quality of different parts of an atomic model derived from diffraction data, you can look at the real space R factor or at the atomic B factor. Do these give the same information or ...
39 views

### How do I clean a wash bottle that is used to store DI water?

I want to use a DI wash bottle in lab, but it's been stored in a cabinet with the top off. I want to clean it before I fill it with DI water. Should I just rinse it off with DI water and then methanol?...
19 views

### Can glacial acetic acid be stored in sub zero temperatures? [closed]

Can glacial acetic acid be stored in sub zero temperatures without the loss of function?
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### Mechanism of nitration for 3° alkanes

I've read that nitration of alkanes gives nitroalkanes, but in the case of neopentane, it forms acetic acid. What is the mechanism for this? Do all 3° alkanes give acid on nitration?
12 views

### Ortho effect and the relative acidity in aromatic acids [duplicate]

What is the order of the acidity of 2-methyl benzoic acid and 2-isopropyl benzoic acid? I know about ortho effect which states that the acidity of ortho- substituted aromatic carboxylic acids is ...
30 views

### How to do a capacitively coupled electrode?

I have an AUTOLAB potentiostat: working electrode (WE, Pt wire), counter electrode (CE, Pt wire), reference electrode (RE, Ag/AgCl solid state). I would like to capacitively couple the potentiostat ...
27 views

### Comparing geometries and substrates calculated with DFT for different pathways

As DFT calculation is an excellent tool for confirming and understanding experimental results, I got deep into this field as organic chemist. I successfully isolated interesting transition states (TS) ...
33 views

### Can different components show different deviations from Raoult's law?

Introduction: Raoult's law is used to calculate the partial pressures of the vapour phases of volatile components of a solution Given that there are two components, A and B, in the liquid-liquid ...
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37 views

### Stannous chloride is not dissolving into water

I am trying pcb tin plating. I am following a formula that uses 50ml water 2gm sulfamic acid 0.5gm stannous chloride 3gm thiouria 50ml water The problem is, my Tin(II) chloride is not dissolving. It ...