# All Questions

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### Volume of K2SO4 needed to achieve a specific K+ ion concentration [on hold]

4.2 You have a 500 ml container in which to prepare a solution of potassium permanganate (KMnO_4). ...
6 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 ...
7 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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### 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 ...
15 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 ...
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 ...
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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### 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 ...
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 ...
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 ...
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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### 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?
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### 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 ...
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 ...
327 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 ...
936 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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### 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?
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### 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 ...
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 ...
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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### 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 $\ce{A → B + C}\,?$
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 ...
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 ...
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?
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 ...
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### 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 ...
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 ...
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?