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3 views

Volume of K2SO4 needed to achieve a specific K+ ion concentration

4.2 You have a 500 ml container in which to prepare a solution of potassium permanganate (KMnO_4). ...
-1
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0answers
4 views

In ideal gas law, what exactly is the value of pV/RT?

I'm aware of the ideal gas law pV=nRT and what each factor stands for. But why is the pV/RT value for an ideal gas 1? What is this value? What does it stand for? Based on the equation, won't you just ...
1
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0answers
5 views

Electrons distribution of oxygen atoms in ozone

While dealing with the Lewis structure for ozone, most of the explanations show the electron distribution around the 3 oxygen atoms with a single and double bond. But if you count the number of ...
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0answers
8 views

Probability of finding electron around nucleus

The square of the wavefunction of 1s electron in hydrogen atom is finite. Multiplying it by dV just around the nucleus would give us the probability of finding electron there. But how can an electron ...
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1answer
14 views

Constant concentrations in solution

I'm a high school student considering the concentration of solutions, and whether the concentration is constant at the bottom or towards the surface. Even then, how would I know that the solution is ...
1
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0answers
8 views

Why is potassium tertbutoxide not used to deprotonate the tertiary alcohol?

The question is asking which reagents can be used to carry out this reaction. I get the L (PCC) is used to turn the primary alcohol into an aldehyde. However, I believe that is not the only reagent ...
1
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0answers
7 views

What Is The Heat Of Combustion Of Diesel And How Do I Find It?

I need help in finding the heat of combustion of diesel, no where online can i find it, and my chemistry teacher does not know how to find it....
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0answers
6 views

What is meant when people say a molecule has high multi-reference character?

I have read some other posts explaining what multi-reference and multi-configuration are with regards to the wave-function (such as this post). However, what does it mean for a molecule specifically ...
0
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1answer
20 views

Why do Ketones Have Lower Wavenumbers than Esters?

The average wavenumber for a ketone is about $\pu{1720 cm-1}$ and the average wavenumber for an ester is about $\pu{1740 cm-1}$. This, however, does not make sense, as the carbonyl group of an ester ...
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0answers
11 views

How do you calculate pH, with different types of acids in solution? [on hold]

New question 41.0 mL of 0.0150 M hydrochloric acid, 130 mL of 0.0650 M hydroiodic acid and 55 mL of 0.00680 M sulfuric acid are pipetted into a 250 mL volumetric flask, which is then filled up to the ...
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1answer
23 views

Balancing the chemical equation using Oxidation Number Method

Permanganate ion reacts with bromide ion in basic medium to give manganese dioxide and bromate ion. Write the balanced ionic equation for the reaction. Please balance the equation using the oxidation ...
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0answers
25 views

Data of phase diagram of water?

I am trying to build a mathematical model that represents the curves of a phase diagram. Is there somewhere I can find the data points of the phase diagram of distilled water?
2
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1answer
149 views

Can sulfuric acid itself be electrolysed?

We all could know by now that water can be electrolysed by adding some sulfuric acid.:) But is it possible that the sulfuric acid itself becomes electrolysed when the concentration of the acid in the ...
1
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0answers
14 views

Coulombic energy of repulsion and exchange energy

In this Wikipedia link about the excited states of oxygen, this diagram is shown. The left most molecular orbital diagram is the first excited state of oxygen, and the MO diagram in the middle is the ...
5
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3answers
312 views

What is “super” in superphosphate?

This question is inspired from a previous question(marked unclear). I don't know about the context of that question but I was intrigued by a statement in that question: Superphosphate is used ...
12
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3answers
871 views

Is “stainless” a bulk or a surface property of stainless steel?

In particular, if I cut a block of stainless steel in half, would the newly formed faces be stainless as well?
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2answers
34 views

Mixtures readily oxidzing organic matter

Are there other mixtures than piranha solution with similiar or better ability to completely and readily oxidize organic matter? Perhaps peracetic/performic acid?
2
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1answer
28 views

Testing for manganese in water

Is there a decent way to test for solvable manganese in water without purchasing a 150USD test kit? I have a fair chemistry set available (I use it to teach my kids chemistry), and would rather pay ...
1
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0answers
23 views

Deriving a Real Gas equation

I've read about the ideal gas law and the van der Waal's gas law. I know that the ideal gas law is horribly inaccurate for temperatures close to, but above the critical temperatures, so it can only be ...
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1answer
44 views

Does more methane equals to more energy?

Typical biogas is comprised of 60% methane and typical natural gas of 85% methane. Typical biogas needs 26 kg/GJ of energy and natural gas needs 54 kg/GJ of energy. I think I can see a relationship ...
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0answers
11 views

Calculating the molarity of strontium phosphate from given quantities

10 g of strontium is reacted with 50 mL of 1 M phosphoric acid to form strontium phosphate and hydrogen gas. What molarity of strontium phosphate is formed? Equation of reaction: $$\ce{3 Sr(s) + 2 ...
5
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2answers
116 views

Atmospheric methane to carbon

I read an article by popsci that talked about huge fans forcing methane over a catalyst. Now that got me wondering, can't we produce hydroxyl radicals with powerfull uv lasers blasting the sky, ...
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0answers
21 views

please help me visualize bond angle? [on hold]

Please help me visualize bond angle! "I mean there are no lines in compounds how we measure angle between such imaginary lines?"asap
13
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3answers
907 views

Is there a commercial liquid with refractive index greater than n=2?

For an application I need a commercial, transparent liquid with refractive index n>2, is there this kind of liquid available? On the web only n=1.81 is routine. The second question is, what's the ...
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0answers
11 views

In the picture below, which one is acidic, alkalalinse and neutral [on hold]

Which form do you think is present at acidic pH, which one in neutral solutions, and which one in alkaline solutions? Briefly justify your answers, based on the availability of protons at different pH ...
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0answers
19 views

Is it safe to boil water in a foil pan on an electric burner?

Is it safe to boil water in a foil pan on an electric burner? Can the metal leach into the water? I've heard some reports recently about avoiding aluminum foil due to it leaching into food. Photos ...
2
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0answers
47 views

Which is more basic: oxaziridine or diaziridine? [on hold]

Which is more basic: oxaziridine or diaziridine? Oxaziridine's got one nitrogen and one oxygen as heteroatoms, while in diaziridine there are both nitrogens.
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0answers
11 views

Applying the constant number of electrons in DFT density optimisation

(Previous related question: Finding mathematically the ground state density in DFT) I am studying the density optimisation procedure (in particular for Orbital-Free DFT) this thesis. The derivative ...
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0answers
23 views

Isomerism , Geometrical isomerism basic concept

Geometrical isomerism is molecule having same molecular formula, same molecular weight but differ in arrangement of atom/group in 3D space which arises purely because of the "hindered rotation" around ...
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0answers
32 views

Why don't Helium atoms instantaneously form bonds?

According to MOT; A helium molecule cannot exist because the energy lowering of electrons in BMO cancels out with energy increase of electrons in ABMO But then if this is the case(i.e E=0) .Then I ...
1
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0answers
18 views

How would you order alkyl groups of this compound numerically?

If akyl groups are ordered alphabetically and ethyl comes before methyl, would this compound be called 2-ethyl-3,4 dimethyl pentane? Since that would be less than 4-ethyl-2,3 dimethyl pentane, correct?...
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2answers
45 views

Can you heat something at alcohol bath?

I have a mixture of $\ce{Et2O},$ $\ce{EtOH}$ and water, and I want to distill off the ether. I am using a water bath so not much water is distilled over, as the boiling water is 100 °C, and the ...
1
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0answers
28 views

Why are the equilibrium exponents stoichiometric when the rate law's are not? [duplicate]

I'm learning about rate law and equilibrium, and the textbook really hammers in that the exponents for the rate law must be determined experimentally - you can't just use the coefficients from the ...
0
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0answers
19 views

What will cure sodium silicate besides CO2? [on hold]

I would like to cure water glass or sodium silicate. I tried air drying, but the skin that forms seems to prevent the rest of the compound from curing.
-1
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0answers
25 views

pH and precipitation of cations with H2S solution [on hold]

In a solution, both $\ce{Pb^2+}$ and $\ce{Zn^2+}$ ion has a molarity of .01 M . In which pH only the $\ce{Pb^2+}$ will precipitate but $\ce{Zn^2+}$ will not do so? The solubility for $\ce{H2S}$ and $...
0
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0answers
16 views

Determining formula of potassium molybdate from the amount of metal deposited during electrolysis

$\ce{K2MoO_n}$ in an acidified solution is electrolysed, $\pu{0.112 L}$ of oxygen is liberated and $\pu{0.32 g}$ of $\ce{Mo}$ is deposited (Atomic mass = $96$). Find $n.$ Now for this, I calculated ...
2
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1answer
81 views

Why must the total increase in oxidation numbers equal the total decrease of them in redox reactions?

In my book, under the topic of redox reactions, it is given, In all redox reactions, the total increase in oxidation number must be equal to the total decrease in oxidation number. Is this a ...
-2
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0answers
41 views

H-1 and H-2 comparison

Why do H-1 and H-2 have different ionization energies and radii ? Is this due to the magnetic dipole moment of the neutron in H-2? Source:"Since the mass of a deuteron is about twice that of a proton,...
-4
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0answers
19 views

How can bonding and anti-bonding molecular orbitals occupy the same space? [on hold]

Can someone explain bonding and anti-bonding molecular orbitals
1
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1answer
105 views

Finding the isotherm with given minima

Get the temperature of the isotherm for water for which the local minimum is at $\pu{100 Pa}.$ Use the values of $a$ and $b$ of water. My approach In the van der Waals equation, set $$\frac{\...
-1
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0answers
16 views

Change in concentration of 1st order reaction [on hold]

For the first order reaction $\ce{A → B},$ is the change of concentration of $\ce{A}$ equal to the change of concentration of $\ce{B}$? And would this be different if you have $\ce{A → B + C}\,?$
2
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0answers
38 views

Number of stereoisomers of polysubstituted cubane

The molecule given below is a substituted cubane. a) How many stereoisomers exist for this molecule? b) How many pairs of enantiomers are possible? How do I calculate the number of ...
0
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0answers
34 views

Why my Daniel cell's voltage increase efficiency continued to drop? Please tell me why?

I'm high school student. I did a Daniel cell experiment, and I connected several Daniel batteries, but the voltage increase efficiency continued to drop. For example, 1V, 1.8V, 2.5V when 1, 2, 3 are ...
2
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0answers
25 views

Finding out more stable conformer via molecular orbital interaction

Out of these two, which one is more stable? I'm unable to imagine the orientation of the lone pairs of O and ABMO of C and Cl bond. Any tips to tackle these kind of problems?
1
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0answers
35 views

How does cross-conjugation destabilizes a molecule?

Wikipedia article on ortho effect suggests that o-toulic acid is more acidic than benzoic acid. This fact is rationalized by suggesting that steric effect causes COOH group to "twist" out of the plane ...
0
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0answers
12 views

Removing potash from water using poly-aluminum chloride

I have been conducting an experiment for a school project, (removing metals from water)I added 50 grams of sulphate of potash to 2 litres of water, then allowed it to dissolve for a 24hrs. On two ...
2
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0answers
25 views

what are the cons of converting plastic to fuel

I have been trying to read how to fix plastic problems, there seems to be 3 outstanding solutions Re-use Recycle Decompose to Fuel Recycling is expensive, requires lots of water and the quality ...
8
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3answers
777 views

What does a comma signify in inorganic chemistry?

$\ce{(Ca{,}Co)CO3}$ I have never ever seen this before. What does this mean exactly?
1
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1answer
28 views

Partial dissolution of non-polar solutes in polar solvents

I have learnt that in order for dissolution to occur, the solute-solvent intermolecular forces must be strong enough to overcome the solute-solute and solvent-solvent forces. However if this is the ...
0
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1answer
60 views

H and H- atomic and ionic radius

A hydrogen anion has a bigger radius than neutral H . Why is this happening ? I mean both electrons exist at the same shell so this is not it. Both H- and H have 1 proton so this is not it as well . ...

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