# Questions tagged [acid-base]

This tag should be applied to questions concerning acid and base reactions. An acid is capable of donating a hydron/ proton (Brønsted acid) or capable of forming a covalent bond with an electron pair (Lewis acid). A base on the other hand is a chemical species/ molecular entity having an available pair of electrons capable of forming a covalent bond with a hydron/ proton (Brønsted base) or with the vacant orbital of some other species (Lewis base).

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### How is NaOH a base?

Firstly, how is $NaOH$ created? My teacher said that before it is $NaOH$, it is $NaO^-$. $$NaO^- + H_2O = NaOH + OH^-$$ If so, that means that $NaO^-$ is a base, which would make $NaOH$ it's conjugate ...
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### Would temperature change affect buffer solutions?

Since buffer solutions are composed of an acid + conjugate base (or base + conjugate acid), would any aspects of it be affected by a temperature change? Since acids and bases exist in an equilibrium ...
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### Does superacid contain hydroxide ion? [closed]

I am studying about autoionized of water, pH scale, acid and base. As I know, every aqueous solutions have this equilibrium: $$\ce{2H2O <=> H3O+ + OH-}$$ If you put more hydronium ion in the ...
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### Why is the side chain of lysine more basic?

According to the images below, the NH3+ on the side chain of lysine is less acidic than the NH3+ closer to the COO-. Why is this? Wouldn't the NH3+ have an intramolecular H-bond with a negatively ...
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### How can I wet etch Nickel Chloride (NiCl/NiCl2) off a GaN sample

Apologies in advance for what may be a basic chemistry question - I'm asking from the point of view of microlithography. I have a Gallium Nitride sample which I have etched in a Ar/Cl plasma with a ...
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### Find the acid dissociation constant given the Kw

A weak acid of initial concentration $\pu{0.2 M}$ with a strong base is titrated until complete neutralization. At the equivalence point the $\mathrm{pH}$ is $9.02.$ Calculate the acid dissociation ...
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### Why don't conc HNO3 react with Al2O3,Cr2O3 and Fe3O4?

The reason for conc. $\ce{HNO3}$ not reacting with aluminum, chromium and iron was given as the formation of protective oxide layer. But the oxides of these metal are amphoteric($\ce{Al2O3,Cr2O3}$)/...
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### What are the compounds in oxygen and carbon dioxide indicator solutions that gives their color?

My brother had some leftover oxygen and carbon dioxide indicator solution for one of his take-home experiments from school, so he let me have them. I want to use them for an experiment and write out ...
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### Where can I find literature values for standard molar enthalpies of neutralization?

I'm looking for enthalpy of neutralization literature values for inorganic weak acids. NIST, PubChem, etc. don't list them. Is there somewhere else I should look?
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### Comparing basic strengths between pyridine and 1,2-dihydropyrazine

Compare the basic strengths of above two compounds. In the first compound (1,2-dihydropyrazine), the lone pair of one N will participate in resonance but the lone pair of other N will not, similarly ...
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### CaCl2 and Citric Acid react /w metal pot

I'm building a dehumidifier based on $\ce{CaCl2}$-solution as descant, which is to be regenerated by heating and evaporation. I thought it would be a good idea to add some citric acid to combat chalk-...
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### Is sodium aquo complex a Brönsted-Lowry acid?

I know that according to Brönsted-Lowry theory, a base is a proton acceptor while an acid is a proton donor. Also, the acid-base pair that differs by a single proton is a conjugate pair. If this is ...
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### How to find the moles of a salt added to a weak base, given ph

I would really appreciate some help with how to approach this: I'm given that: Methylamine (CH3NH2) is a weak base used in the manufacture of pesticides. Taking into account that the degree of ...
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### Why is the gradient of the curve of a strong base titrated with strong acid small up until equivalence?

I understand the cause of the sharp decrease in pH upon reaching the equivalence point, but I don't understand why addition of relatively large amounts of the strong acid would be accompanied with ...
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### Effect of dilution on weak acids pH [closed]

My textbook has a question which says what would happen to the pH of a weak acid if it is diluted with water. The answer is its pH would decrease. My teacher’s argument is that it would indeed ...
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### Why is dilution exothermic?

The breaking of bonds usually absorbs energy and forming bonds usually releases energy. Then, why is the dilution of acids and bases exothermic?
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### CO2 + High humidity = transperent substance?

First I want to point out that I am not a chemist, sorry for bad description. I have CO2 incubator. CO2 concentration is 10-20% and the humidity level is around 90%. I was using a humidity sensor to ...
I recently stumbled upon a pretty interesting chemical: tetraxenonogold(II) $\ce{AuXe4^2+}.$ Basically, an atom of gold with four xenons around. It is a product of a superacid reaction and it is ...