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4 views

Connection between Gibs free enrgy and Solubility

My text book says that despite the sign ,if the magnitude of the gibs free energy we calculated Increases ,the solubility will descrese.Can you please explain this?
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1answer
18 views

How could benzenehexol be reduced to benzene?

How could benzenehexol (hexahydroxybenzene) be reduced to benzene? Could an active metal like potassium remove the oxygen?
-1
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1answer
22 views

Iodine exception

The state of a substance depends on the intermolecular bonds between the molecules of the substance.The stronger the intermolecular bonds , the harder the substance becomes a gas. Iodine molecules ...
1
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1answer
25 views

Using molecular orbital for determining leaving group trend and nucleophilicity

Here is the question. Which one has better leaving group, cyclohexanol or cyclohexane that has $\ce{OH_{2}^{+}}$ substituent? Explain. I know the answer is the latter because if both compounds are ...
1
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0answers
14 views

Activity of NaCl aqueous solution at high ionic strengths: Common-ion effect

Is there any theoretical way to estimate the activity of $\ce{NaCl}$ at high ionic strengths in water and that in $\pu{7 M}$ $\ce{NaCl}$ solution? This question is based on whether solubility of $\ce{...
2
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1answer
17 views

Application of Nernst Equation in Potentiometric titration of $Fe^{2+}$ with $Ce^{4+}$

It is well Known that to find $E_{cell}$ during titration of $Fe^{2+}$ with $Ce^{4+}$ we consider 3 domains: Before Equivalance point , $E_+ = E_{Fe^{3+}/Fe^{2+}}^o+\frac{RT}{nF}log\frac{[Fe^{3+}]}{...
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0answers
22 views

Minimize ozone generation while generating negative ions of air? [on hold]

Consumer air ionizers do this; I'm looking to build something larger, but I still need to keep ozone generation at the smallest minimum possible. What is the method? A precise voltage to the ...
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0answers
19 views

why is there a net current at halfwave potential?

Im wondering why there is a current measured at a halfwave potential? According to my understanding at the halfwave potential of a diffusion controlled reduction or oxiation at an electrode, there is ...
-1
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0answers
17 views

What is the definition “Moist Chlorides” [on hold]

I am currently evaluating material suitability for a project. When looking at some suppliers technical data sheets there is a distinction of sea water, brackish water, and then there is sometimes a "...
-5
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0answers
13 views

Sodium Chloride solution question [on hold]

What is the mass of sodium chloride used to create a 100 mL solution at a concentration of 1.5 M? Please provide any of the work done to solve the problem as well.
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0answers
10 views

Ionic Equilibria [on hold]

Grape juice has a pH of 3.75. Grape juice can be titrated with standard alkali. A 25.0 cm³ sample of grape juice was exactly neutralised by 27.5 cm³ of 0.100 mol dm^-3 sodium hydroxide using ...
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0answers
20 views

Which compound can be purified by forming a hot aqueous solution that recrystallises on cooling? [on hold]

A. Cyclohexene B. Ethanoic acid C. Phenylamine D. Benzoic acid I thought it was C but it’s wrong. What’s the correct answer and why?
9
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1answer
513 views

Will Proving or Disproving of any of the following have effects on Chemistry in general?

I am working on a project relating to- https://en.wikipedia.org/wiki/Millennium_Prize_Problems I wanted to list the effects of them being proved or disproved in different aspects of science and maths....
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1answer
17 views

Assigning Cahn-Ingold-Prelog priority numbering rules for 2 groups

I was asked to draw the perspective formula of $$\ce{(3R,4R)CH2=CH-CH(CH3)-CH(CH3)-CH2-CH3}$$ Then I had to assign priority between the two groups: $$\ce{-CH=CH2}$$ and $$\ce{-CH(CH3)-CH2-...
1
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1answer
34 views

Explaining the result of experiment---Aluminum foil heated in boiling KMnO4 solution

I've recently been thinking back to an impromptu "experiment" I performed almost exactly 3 years ago. The setup was as follows: A concentrated solution of KMnO$_4$ was produced by dissolving 2 ...
-1
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0answers
19 views

What forms/allotrope Does most common steel/iron exist in? [on hold]

Sorry to ask such a seemingly basic question, but I cannot seem to find a site that lists allotrope, formulas, etc. of steel by how common they are.... I've read extensively (I think) about austenite,...
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0answers
24 views

Gas Composition Undergraduate Assignment Question [on hold]

I recently was given a homework problem relating to gas composition. The Gas in question is gas that is dried, so I asked my TA whether or not this included water. The TA said that the question does ...
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0answers
15 views

GSR (skin conductance) on leather [on hold]

In terms of GSR, skin conductance is used to measurfe and analyze differences in conductivity. However is it possible that leather (aka tanned and dead skin) has conductance values like living skin? I'...
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0answers
23 views

Gas Composition Undergraduate Question [on hold]

Given this question, how would you go about determining the composition? Natural gas before treatment consists of 40.0% methane, 15.0% ethane, 10.0%, carbon dioxide, 15.0% hydrogen sulfide ...
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0answers
17 views

IR vs Raman Activity from Character Table [on hold]

For the molecule trans-1,2-dichloroethene (point group $C_\mathrm{2h}$) determine using only the two C−Cl bond elongation vectors the symmetries of the possible C−Cl stretching modes. The $z$-axis is ...
-4
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0answers
18 views

Show that the following processes are irreversible [on hold]

Show that the following processes are irreversible. (a) Gas freely expands from V to V+dV (dV>0) adiabatically, and (b) Gas expands adiabatically from p to p+dp (dp<0) via the Joule-Thompson ...
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0answers
17 views

How to dissolve PLA/PCL/PMMA?

I have a research about electrospun membrane synthesis where I dissolve PLA pellets in chloroform:methanol (3:1) for 3 hours and also PCL pellets in chloroform:methanol (3:1) for 3 hours too. Another ...
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1answer
36 views

Which reaction occurs first when 5-hexen-1-ol reacts with sulfuric acid?

I am trying to solve this question: Find the major product of the following reaction: Now we could either do electrophilic addition on the alkene or do dehydration of alcohol. These two ...
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0answers
28 views

the differences between glycerol and its commercial version glycerin [on hold]

Does glycerin still have the same magnetic properties as glycerol can someone please tell me it is for a science project that i need to explain just so i can make a visual representation of how it ...
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0answers
28 views

The most acidic hydrogen of 4‐hydroxybutanenitrile

Identify the most acidic hydrogen atom in the compound below: $$\ce{NC-CH2-CH2-CH2-OH}$$ My teacher said that the $\ce{H}$ connected to $\ce{O}$ is the most acidic since $\ce{O}$ is more ...
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0answers
12 views

combustion analysis [on hold]

2.4g of a compound of H,C,O gave on combustion 3.52g of carbon dioxide and 1.44g of water. the RMM of the compound was found to be 60 what is the masses of C,H,O what is the empirical formula of the ...
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0answers
112 views

Molecular orbital energies prediction with ML algorithms

In the recent years, computational chemistry community has focused on Machine Learning algorithms to predict molecular properties. Unfortunately, many of the authors of such papers are not chemists, ...
-1
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0answers
25 views

How can carbon black be pellet? [on hold]

I want to make the carbon black paste and pelleterized it. What solvent can be used to heat up after carbon is formed?
-3
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0answers
16 views

The rate of diffusion of two gases A and B are in the ratio 16 is to 3 if the ratio of their masses present in the mixture is 2 is to 3 then [on hold]

The rate of diffusion of two gases A and B are in the ratio 16623 is the ratio of their masses present in the mixture is 2 is to 3 then
1
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0answers
35 views

Propylene Glycol to clean vinyl records

I clean vinyl records with an ultrasonic record cleaning machine. Would propylene glycol be good to use as a surfactant in a 1 - 2 % concentration with distilled water? Would it harm the vinyl record?...
-2
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0answers
15 views

Solutions and Dilutions [on hold]

I have a 1g per 80ml stock solution.I would like to create a 0.001g per Liter solution what volume of the stock solution should I add to make up a 1L solution?
-1
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0answers
13 views

Energy Conversion in a Activated Complex

My book states that transition state has highest energy out of Reactants and Products . My question is why ? If we follow law of conservation of energy shouldn't the extra energy given + existing ...
-1
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1answer
22 views

Chemical reaction balance - High pH carbonic acid and calcium iodide solution

Is it possible to write the following chemical reaction in one compact balanced form instead of being two separate sections at the right hand side? $\ce{CaI2(aq)}$ + $\ce{2NaOH(aq)}$ + ($\ce{2H+}$ + $...
-2
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0answers
49 views

Equivalent weight of salts [on hold]

I was solving, my homework question, using chemical equivalence, question was this $448\ \mathrm{ml}$ of $\ce{SO2}$ at ntp are passed through $100\ \mathrm{ml}$ of a $0.2\ \mathrm N$ solution of $\...
1
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0answers
20 views

Sources for files for testing a thermal ellipsoid (ORTEP) program

I am trying to reimplement the functionality of the classical program ORTEP for producing thermal ellipsoid plots of a crystal/molecule in a modern computer language. Unfortunately, I am having ...
2
votes
1answer
494 views

Reaction of aqueous sodium carbonate with aluminum foil

Aqueous sodium hydroxide is known to react with aluminum foil in an exothermic, hydrogen-gas releasing reaction like $$\ce{2NaOH(aq) + 2Al(s) + 2H2O(\ell) → 2NaAlO2(aq) + 3H2(g)}$$ However, on ...
-1
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0answers
38 views

How to name ionic and molecular compounds? [on hold]

There's something about Chemistry that I need to clear up. Naming compounds. So I heard that there are different ways to name a compound depending on what it is. But I can't keep track of it all! ...
-1
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0answers
40 views

Differential rate laws [on hold]

Consider the following consecutive second-order irreversible reactions carried out in a batch reactor: $$ \begin{align} \ce{A + S &->[$k_1$] X}\\ \ce{X + S &->[$k_2$] Y} \end{align} ...
2
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0answers
23 views

eV and redox potential

I am trying to estimate the redox potential of an excited state as described in this reference. The paper says: The reduction potentials associated with the excited states cannot be directly ...
-3
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0answers
24 views

How do chemical signals store information? [on hold]

How exactly do chemical signals store & transmit information , eg. How do the chemical reactions in the eye paint a picture ? There must be information stored in the signals that tell the brain ...
0
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0answers
56 views

Can I reverse an iron redox reaction with potassium hydroxide and electricity?

For a school project, about clean energy, me and my team are trying to build an iron battery. We are using a piece of iron (anode), potassium hydroxide (electrolyte), carbon electrode (cathode) ...
-1
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0answers
32 views

What is the ΔG* value for nucleation? [on hold]

To be honest, I would like to know how $\Delta G^*$ is different from $\Delta G$ in general and whether the star has any other significance. Now, moving to the second question. I was asked to find $\...
-1
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0answers
18 views

How can I better wash off soap with soft water? [on hold]

When using distilled water to wash off real soap, my hands still feel slippery. After doing some research it seems that the reason for this is due to the fact that soft or distilled water is incapable ...
2
votes
1answer
54 views

Why is the 2nd ionization energy of chloride similar to that of sulfur?

The first ionization energy of chloride is significantly greater than that of sulfur. I suggest that this is very expected as the effective nuclear charge of chloride is higher and additionally, ...
0
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0answers
27 views

Software to predict equilibrium products in the ideal gas phase

I'm interested in software packages that can answer the following kind of question: If I mix 30mol% $N_2$ and 70mol% $H_2$ together at 2 bar and 2000C, what is the equilibrium composition after all ...
-1
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0answers
25 views

Why is [Fe(CN)6]3- more stable then [Fe(ox)3]3- despite being a non-chelate?

I was reading up on how chelation leads to more stability of a complex, and then I came across this weird trend given by my professor in class as a contradiction, with no explanation. I'm curious what ...
-1
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0answers
39 views

Why was 6M HCl and 5M NaOH added the the procedure below? [on hold]

I am currently analysing a chemistry experiment which has been conducted and there are some steps which I cannot understand about the procedure and methodology which the scientists have used. Being a ...
-1
votes
1answer
45 views

Does bicarbonation require water?

In an aqueous solution of $\ce{NaOH}$ exposed to the atmosphere one can probably expect some degree of $$\ce{NaOH(aq) + CO2(g) -> NaHCO3 (aq)}$$ But, what would happen if just a solid block of $\...
1
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0answers
31 views

Diastereoselectivity of the Pauson Khand Reaction

I hope someone may help me. I don‘t know how to determine the diastereoselectivity of the product of the Pauson Khand reaction in generally. In the following I’ve got 3 practice examples,however in ...

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