New answers tagged

-1

Well I actually tried a small jar of the Enzymatic product with a sample of the nesting material I already removed as well as small piece of .023 6061 aluminum... Overnight the aluminum was completely decomposed. The nesting material seemed unfazed. So much for that idea!


0

A nucleus has the following roles in an atom. It contains almost all the mass of the atom It is positively charged and hence keep the electrons in orbit via electromagnetic force (attractive) A nucleus contains protons which determine which element the atom is of That's all. And, no, it is safe to assume that nuclei don't move within the atom, they are ...


-1

Strong or weak electrolytes will depend on the hydration enthalpy of products in water. That's why any salt like $\ce{NaCl}$ will completely dissolve in the water, though $\ce{NaCl}$ has high bond energy in powder form. In the above case, the hydration of the $\ce{Na+}$ ion will be so dominating that the salt will dissociate (hydrated) completely despite ...


0

Instead of using a formula, think ! How much does $\pu{10 mL}$ vinegar weigh ? Answer: $\pu{10.2 g}$. You have found that this sample contains $\pu{0.048 g}$ acetic acid. As a consequence, the percentage of acid in vinegar is : $\frac{\pu{0.048 g}}{\pu{10.2 g}} = \pu{4.7E-3} = 0.47$% P.S. Are you sure of these numerical values ? Usual vinegars are at least $...


0

The "expanding solution" problem is irrelevant if you use standard techniques First, you need to realise that a standard solution is a known amount of solid in a known volume of solution not a known amount of solid and a known amount of the solvent. You don't need to know how much solvent you use. So you need to target getting a result that ...


-1

This is an example of a Schott bottle: Using the volume markings would not be very accurate, so you would weigh the water. Citric acid solution is indeed less dense than you would calculate from the volumes and densities of water plus citric acid. 30% solution has a density of 1.13, but the arithmetically calculated density is 1.1995 from citric acid ...


-1

One thing is usual solubility in g/100 mL, other thing is solubility as percentual mass fraction. (Improperly used) 59.2 w/w obviously means 59.2 weight percent, as this solubility data – noted properly – is listed in wikipedia: Citric acid. You need 59.2 g of the acid and 40.8 g of water ( about 40.8 mL or approx. 41 mL ), in total 100 g. The volume will be ...


1

Iodine itself has a comparatively high vapor pressure, ~40 Pa at room temperature, so iodine solutions, e.g. tincture of iodine (iodine in ethanol/water), lose iodine by evaporation (well, by sublimation, from the solid). This just means that the strength of the antiseptic is reduced if left open, not that it has not "gone bad," in the sense of ...


1

A solution of iodine antiseptic is a medical item that is used for improving health. There are two ways to treat your cracked cap. #1. If you inspected the bottle in the drug store before you bought it, you would not buy this bottle. Almost all over-the-counter medicines have warnings: Do not use if the safety seal is broken. So, out of utmost caution, do ...


5

To sum up the comments, only the following relation for the total amount of solution $n_\mathrm{tot}$ is universally true: $$n_\mathrm{tot} = n_\mathrm{solvent} + n_\mathrm{solute} = \frac{m_\mathrm{solvent}}{M_\mathrm{solvent}} + \frac{m_\mathrm{solute}}{M_\mathrm{solute}}\tag{1}$$ The best you can do is to assume that $n_\mathrm{tot}\approx n_\mathrm{...


0

I think that you should focus on what you wrote first, longer the hydrocarbon chain higher their entropy in solution. When dissolved, they can access a multitude of states both energetically and in spaces (think of all possible conformers). This said, it does not mean that they must dissolve in, eg, water. Right because the H term.


0

For the record, elemental iodine does not displace chloride! Per an educational source, for example, to quote: These reactions will take place in one direction only. The reaction of a halogen X2 with a different sodium halide (NaY) will occur only if X2 is more reactive than Y2. If X2 is less reactive than Y2, the reaction shown in Equation 1 will not take ...


1

Total mole fractions of a system are known, constant and can be measured or calculated at/for any time ( no reaction is assumed ). Mole fractions within a gaseous or liquid phase are measured or calculated in context of Raoult law for the state of equilibrium, unless they are defined as an initial state for a particular scenario.


Top 50 recent answers are included