# All Questions

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### What is the rate constant k for the reaction between potassium manganate and oxalic acid?

For my school's chemistry classes, I am investigating the kinetics of the redox reaction between $\ce{K2MnO4}$ and $\ce{C2H2O4}$. I analyzed the data using a colorimeter set to $\pu{565nm}$. ...
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### What are the products when KCl and H2SO4 reacts? [closed]

I have been trying to find the right answer by googling and I just ended up finding multiple answers. Ans #1: $\ce{2KCl + H2SO4 -> K2SO4 + 2HCl}$ Ans #2: $\ce{KCl + H2SO4 -> KHSO4 + HCl}$ Can ...
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### Isomers of a Cycloalkane [closed]

What I know: All alkanes are saturated hydrocarbons with the general formula, $C_nH_{2n+2}$ All alkenes are unsaturated hydrocarbons with the general formula, $C_nH_{2n}$ What's Confusing Me: This ...
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### Magnetic behaviour of potassium permanganate

I was going through the properties of potassium permanganate and found this- It has two physical properties of considerable interest: its intense color and its diamagnetism along with ...
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### Determining the leaving group for substituted benzene in Aromatic nucleophilic substitution

I could figure out that After the substitution of one of the halogens, with the $\ce{-OCH3}$ group(Electron donating group), the ring would be deactivated towards nucleophilic substitution hence the ...
37 views

### what does Area(A) in Randles-sevcik equation refer to? geometrical area of electrode or electrochemical active surface area/

In the Randles-Sevcik equation, $$i_p = 0.4463 \ nFAC \left(\frac{nFvD}{RT}\right)^{\frac{1}{2}}$$ we have an area $A$ in the formula. is this the electrochemically active area or geometrical area? ...
31 views

### How many equivalents of Grignard reagent does a nitrile group consume?

I was looking at reactions of grignard reagent with certain kinds of compounds and came across it's reaction with nitrile group: What I was wondering is what if we don't react the Imine formed after (...
28 views

### Why is Cu2o[Copper(I) oxide] a (p-type)semiconductor?

Statement: Cu2O[Copper(I) oxide or cuprous oxide] is an extrinsic (p-type) semiconductor. Main Question: But why is Cu2O an extrinsic (p-type) semiconductor? My confusion: I understand how Silicone ...
44 views

### Can dehalogenation reaction occur through E2 mechanism? [closed]

I have seen examples of dehydrohalogenation reaction that occur through E2 mechanism but never came across dehalogenation reaction that occur through E2 mechanism (for example, dehalogenation of 1,2-...
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### What unit and dimension for membrane permeability / permeation expression?

Context When studying the diffusion of gases through thin membrane, one may use the diffusion coefficient $D$ used in Fick's laws as (one dimension form): J = - D \cdot\frac{d\varphi}{...
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### What does the state of a substance at a specific T and P mean?

From the phase diagram of water, we see that water is a liquid at 20°C, 1 atm. The state of the water at 20°C, 1 atm is liquid. But there is actually also a water vapor in equilibrium with liquid ...
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### Why is surface tension of water decreasing as sodium chloride concentration increases? [duplicate]

For my IB chemistry IA, I am measuring the impact of salinity concentration on the surface tension of water (i am using distilled water). My hypothesis is: As the concentration of salt increases, ...
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### Linear equations for constructing molecules with covalent bonds

(By training I am a math-guy and my knowledge of chemistry is restricted to school level) I have read a little bit about the electron spheres and sub-spheres, the Aufbau principle and covalent bonds ...
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### Out of tropolone and tropone, which is more soluble in water?

According to me tropolone has intramolecular H-bonding, so extent of H-bonding with water will decrease and thus, will be less soluble. Tropone (Cyclohepta-2,4,6-trien-1-one): Tropolone (2-...
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### Phosphate buffer not electroneutral? [closed]

According to the equations below, the phosphate buffer is not electroneutral, except at pH = 7. But it should be electroneutral, right? What did I miss here? In order to prepare $X\,\pu{ M}$ buffer ...
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### Question about TLC [closed]

I conducted TLC to confirm Rf value of toluene. Eluent was hexane+ethyl acetate(10:1 vol). Then I used UV lamp (254 nm) to identify the spot. But there was no any spot. I had understood that toluene ...
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### What is an effective preservative for guar gum slime?

I am attempting to find an effective preservative for guar gum slime. I am using typical recipes: A borax solution of 4%, a guar gum solution of 5% using distilled water, and a mix ratio of 20:1 (guar ...
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### Common ion effect on Solubility [closed]

The common-ion effect refers to the decrease in solubility of an ionic precipitate by the addition to the solution of a soluble compound with an ion in common with the precipitate.[1] This behaviour ...
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### In an equilibrium with solvent in reaction, when we want to determine the reaction direction, do we account for the 55.6 mol/L of water? [duplicate]

Usually when we calculate the equilibrium of a reaction with a solvent, the solvent is ignored whether it is a reactant or a product. For example when $$\ce{CH3COOH +C2H5OH <=> CH3COOC2H5 +H2O}$$...