2
According to this site
Povidone iodine is inactivated or becomes unstable in the presence of sodium thiosulphate, heat, light or alkaline pH. Once opened – use immediately. Discard immediately after first use.
Note the instability to light. Do not store this open-topped or in a clear glass bottle. You will need to make up your gargle solution fresh each ...
2
This is a reasonable question. Basically it asked whether the pre- or below-boiling-point vapor composition can be different from the liquid composition, although they are known to be the same at the boiling point according to the property of azeotropes. We can come up with a right answer by the following careful thinking.
You are looking at a bottle of ...
2
I did a bit of research but could not find any source on solubility of these substances in ethanol.
ChemSpider has some indirect prediction of the solubility of CBGA and GBDA in the form of a logP value. In a two phase system of water and octanol, substances with higher logP have a higher fraction in the octanol phase. Ethanol has a logP of −0.18, while the ...
1
Here's the answer if anyone is wondering.
$$m_{X_\mathrm{4}O_\mathrm{6}} = \frac{16*6*100}{43.7} = 219.7g$$
$$m_{X_\mathrm{4}} = 219.7 - 96 = 123.7g$$
$$m_X = \frac{123.7g}{4} = 30.99g$$
$$n_X = \frac{43.7\%}{30.99} = 1.443\ \ \ \ \ \ \ \ \ \ \ \ n_O = \frac{56.3\%}{16} = 3.519$$
$$\frac{1.443}{1.443}\ \ \ \ \ \ \ \ \ \ \ \ \ \frac{3.519}{1.443}$$
$$1\ \ \ \...
1
Evaporation is not the most efficient way of obtaining sugar crystals, because usual sugar is extraordinarily soluble into water. $100$ mL water dissolves $170$ g sugar at $0°$C. And it dissolves $450$ g sugar at $100$°C.
So if you want to get not too tiny sugar crystals, you better try to get them by cooling down the hot saturated solution. As it may take ...
1
An iodine solution gets discolored if left uncovered after more than one day. And there are at least two reasons : 1) Iodine is slightly volatile and slowly evaporates from any aqueous solution (but this is not the main reason). 2) The French chemist Louis Pasteur has shown in $1880$ that air contains plenty of organic spores, pollen, dust, bacteria and ...
Only top voted, non community-wiki answers of a minimum length are eligible