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 is on the other hand a chemical species/ molecular entity having an available ...

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2
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1answer
12 views

Does imidazole and hydrochloric acid yield imidazole hydrochloride salt?

I'm asking this because I found a link for imidazole-HCl buffer: , but from what I understand, a buffer is a weak acid or base with its corresponding salt. Would imidazole-HCl buffer be a salt ...
3
votes
0answers
41 views

Why do chloride ions not bond to water molecules/hydronium ions when hydrochloric acid dissociates? [duplicate]

I am a high school student and I was reading a textbook and it gave me the equation of this hydrochloric acid which was put into water and the products formed were hydronium and chlorine. $\ce{HCl ...
0
votes
1answer
22 views

percent ionization explanation [duplicate]

Using a weak acid as an example: $$\ce{HOAc <=> AcO- + H+}$$ The position of this equilibrium shifts to the right with increasing dilution. I have found textbooks that say this, but do not ...
-3
votes
0answers
27 views

Determine the molarity of a HCl solution by titration with NaOH [on hold]

To titrate $15.00~\mathrm{mL}$ of an unknown HCl sample, use $25.00~\mathrm{mL}$ of a standard $0.2~\mathrm{M}$ NaOH titrant. What was the Molarity of the HCl solution?
0
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0answers
14 views

What are metallosis hip replacement complications? [on hold]

What are metal on metal hip replacement physiological effects metallosis cobalt chromium?
1
vote
0answers
33 views

Why does solvation release energy? [duplicate]

Whether dissolving acids and salts is exothermic or endothermic, depends on the lattice and solvation energy. Breaking bonds in the lattice requires energy and is endothermic - that is clear. However, ...
4
votes
1answer
36 views

Sodium Polysulfide production from NaOH and Sulfur

Does the sulfur also oxidize the $\ce{OH-}$ radicals after the $\ce{Na2S4}$ chains form? Something like this: $$\ce{9S + 4NaOH -> 2Na2S4 + SO3 + H2O}$$
0
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0answers
14 views

The reason for bicarbonate acting as a buffer

My question is: what is the primary reason that bicarbonate ($\ce{HCO3^-}$) can act as a buffer in a solution? The two (possibly) relevant equations that I can think of are $$ \ce {H2CO3 + H2O ...
4
votes
0answers
18 views

What is the relationship between the two definitions of the difference between basicity and nucleophilicity?

(Clarification: this is a question about terminology, not so much about when to use different concepts. I think I do understand which characteristics of a species to use when trying to determine ...
1
vote
0answers
23 views

If both Nitric acid and Nitrate ion are stabilised through resonance, what makes Nitrate ion more stable in aqueous medium?

If both Nitric acid and Nitrate ion are stabilised through resonance, what makes Nitrate ion more stable in aqueous medium? Can the same argument be applied to Nitrous acid and Nitrite ion in aqueous ...
-2
votes
1answer
37 views

How do you know that Sodium Hydrogencarbonate is amphiprotic?

Do you just have to remember that it is? For example, I know that substances with CHs are hydrocarbons. Does such a 'code', if you will, exist for amphiprotic substances ?
5
votes
0answers
35 views

By how many pKa units will the pKa value of a ketone be minimized by addition of a lewis acid?

I want to enolize a ketone, let's take for instance acetone with a pKa value of about 20 (in $\ce{H_2O}$). Now I'd like to know if there exist rule of thumb (I don't think so), by how many pKa units ...
2
votes
1answer
68 views

Making carbon monoxide gas from formic acid and sulphuric acid?

Can I create carbon monoxide gas by just mixing formic acid and sulphuric acid together. Or do they have to be heated?
2
votes
1answer
32 views

Does the addition of base to 3-pentanone give the cis or trans enolate?

I've spent several hours searching the WWW with entries like "stereoselective enolate formation" and similar ones, but I find almost only entries for Li-amide bases (LDA, LMTP) and no other bases like ...
3
votes
1answer
22 views

Why does hydrogen phosphate act as a base?

Let's look at question c So, I'm a bit confused with what's happening. It seems that water is acting as an acid in this reaction, and donating protons to the ion. Can someone just elaborate on this ...
2
votes
0answers
32 views

Neutralization reaction with insoluble salt (weak acid, strong base)? [duplicate]

Consider the following reaction. $\ce{2 HF(aq) + Ca(OH)2(aq) -> CaF2(s) + 2 H2O(l)}$ The reaction produced a fairly insoluble salt. Assume that this reaction proceeds entirely to completion as ...
0
votes
0answers
21 views

Titrating a base into an existing acid-base mixture

I am trying to determine the mass of a particular product in a reaction, which is as follows: phenylamine + ethanoic anhydride -> N-phenylethanamide + ethanoic acid So, I perform the experiment, and ...
1
vote
0answers
18 views

Confusion between bases (not alkali) and other -OH containing compounds [duplicate]

Since some bases are not alkaline, we can't check whether they give $\ce{OH-}$ ions or not. Ethanol also has a $\ce{-OH}$ group. Why isn't it a base?
5
votes
2answers
137 views

Does bleach (without rinsing) leave residue(s) and could vinegar or baking soda (or vitamin C) neutralize it?

It's very difficult to get accurate information concerning the household bleach residues. Imagine for instance you pour pure (or diluted) bleach on a fabric or synthetic foam and let it dry without ...
0
votes
0answers
84 views

What is the product of 1,1-diphenylethanol + Montmorillonite K10 Clay undergoing microwave radiation? What is the mechanism for it?

What is the product of 1,1-diphenylethanol + Montmorillonite K10 Clay undergoing microwave radiation? What is the mechanism for it? My effort: 1,1-diphenylethanol + Montmorillonite K10 Clay ...
1
vote
1answer
57 views

How can glycine act as a buffer at pH 6.00 and why?

How can glycine act as a buffer at pH 6.00 and why? Please use chemical equations to show how it can act as a buffer at this pH specifically? my work At the pH 6.00 glycine act as a buffer ...
0
votes
1answer
50 views

Acidity of substituted benzoic acids

Rank the following molecules in order of increasing acidity: Benzoic acid, 4-nitrobenzoic acid and 4-methoxybenzoic acid. I believe that it has to do with the presence of activating and deactivating ...
18
votes
1answer
3k views

Could milk rust a steel teaspoon?

Recently, while cleaning a neighbour's fridge (turned off for a few weeks), I came across a cup (closed with a lid). Inside the cup was, to my olfactory horror, congealed milk, with a steel (iron) ...
6
votes
3answers
330 views

Why is propanoic acid weaker than butanoic acid?

I was reading about electronic effects in organic compounds, and I found the explanation that carboxylic acids are weakening as their number of carbon atoms increase. But I found a table of ...
1
vote
0answers
39 views

Is the pH of a solution (orange juice) affected by the presence of a metal?

Is the pH of a solution (orange juice) affected by the presence of a metal (aluminium, tin or iron for example)? I know that the metal will corrode in the presence of an acid (citric acid in this ...
4
votes
1answer
60 views

Atmospheric Nitrogen gas and human body pH buffers

It looks like the human body doesn't have the ability to breakdown atmospheric $\ce{N2}$, as of now $\ldots$ So an enzyme like nitrogenase (found in cyanobacteria) fixes $\ce{N2}$ and produces ...
6
votes
1answer
47 views

Does phosphoric acid remove stainless steel electropolished layer?

Electropolished stainless steel has a high corrosion resistance due to the oxide film that is created during electropolishing. The film mainly consist of chromium(III) oxide. Phosphoric acid is ...
1
vote
2answers
56 views

What is the quickest way to dissolve steel?

What is the quickest way to dissolve a large chunk of steel? I mean a very quick reaction, assuming that the interaction occurs in a sealed or semi-sealed environment? Reaction times of the order of a ...
1
vote
1answer
78 views

Are my protolysis equations right?

We had the task to solve several salts in water and measure the pH value of the solution. After that we should "create" the protolysis equation and to tell about Chemical equilibrium[s]. I get some ...
5
votes
0answers
50 views

A doubt on phase equilibrium?

Below is a transcript of this doubtful question: A weak monobasic organic acid HA issoluble in both solvents, water and $\ce{CHCl3}$. 500.0 cm$^{3}$ of a solution of $\ce{HA}$ is 0.057 mol ...
6
votes
1answer
62 views

Condition For NaHCO3 to react to form CO2 with organic acids

My professor told us the following: $\ce{NaHCO3}$ will react to evolve $\ce{CO2}$ whenever the acidic nature of the reactant exceeds the acidic nature of benzoic acid. I want to know why ...
6
votes
2answers
212 views

Why is H2S2O7 stronger than H2SO4?

I think sulphuric acid will be the correct answer. I can't find answer. Please show your reasons. My attempt: I've read that, for an oxi-acid, the oxidising number of the central atom shows the ...
4
votes
1answer
35 views

Calculating pH in titration of monoprotic weak acid with strong base

I’m working on this problem: $25.0\:\mathrm{ml}$ of $0.10\:\mathrm{M}$ $\ce{CH3COOH}$ is titrated with $0.10\:\mathrm{M}$ $\ce{NaOH}$. What is the $\mathrm{pH}$ after the addition of ...
2
votes
1answer
148 views

Phosphate buffer from phosphoric acid and K2HPO4?

Is it possible to make a solution of ph 7 phosphate buffer solution using phosphoric acid and $\ce{K2HPO4}$ ? How can I calculate the amount of $\ce{K2HPO4}$ needed for 1L of phosphoric acid ? Edit: ...
5
votes
3answers
225 views

Why amino acids (Zwitterion) become either negative or positive at low and high pH solutions?

The amino acids are Zwitterions. In neutral pH, an Amino acids' amino group has a + postive charge and Carboxyl group has - negative charge. They cancel each others charge thanks to the H that's ...
4
votes
1answer
68 views

Do carboxyl groups behave like a base and amino groups behave like an acid when creating peptide bonds?

Peptide bonds are synthesized when the carboxyl group of one aminoacid molecule reacts with the amino group of the other aminoacid molecule, causing the release of a molecule of water. Water ...
8
votes
1answer
171 views

How to analyze a acid and salt mixture using titrimetry?

Given a mixture of $\ce{HCl}$ and $\ce{MCl3}$ and the following dissociation constants for $\ce{M(OH)3}$, how can the concentrations of $\ce{HCl}$ and $\ce{MCl3}$ be determined separately by titrating ...
4
votes
1answer
63 views

Pourbaix diagram – writing reactions

How would you go about writing the reaction between water and chromium metal under standard acid and base conditions? I know you would have to look at the vertical lines at pH 0 and 14 but I don’t ...
2
votes
0answers
29 views

Is passivation of stainless steel feasible in the field?

Does anyone have input or experience on passivation of stainless steel, particularly in outdoor environments where submersion of components is not practical due to location or size? Nitric acid (and ...
4
votes
0answers
114 views

How to calculate the pH of a 0.325 M solution of C5H5NHF?

How to calculate the $\mathrm{pH}$ of a $0.325~\mathrm{M}$ solution of $\ce{C5H5NHF}$? The $K_\mathrm{b}$ for $\ce{C5H5N}$ and $\ce{C5H5NH+}$ is $1.7\cdot10^{-9}$. Here's my work, but it's wrong (at ...
2
votes
2answers
44 views

What is the difference between these equations for the Contact process?

Some webpages describe the contact process as this (I left out $\ce{SO2}$, $\ce{SO3}$ production): $\ce{SO3 + H2SO4 -> H2S2O7}$ After this, it is controllable to add water to the oleum therefore ...
0
votes
0answers
23 views

Qualitative Analysis of Anions

From the image above, if you all could take a loot at step 1a. It makes no sense to me. I do not understand why adding $\ce{CH3COOH}$ has any effect on the solution whatsoever. What is the point of ...
5
votes
3answers
80 views

Is the Henderson–Hasselbalch equation volume independent?

Looking at this equation $\mathrm{pH} = \mathrm{p}K_\text{a} +\log\frac{[\ce{CB}]}{[\ce{A}]}$ makes me think that it is concentration independent. What I mean is, when we look at ...
4
votes
1answer
88 views

What's the simplest way to etch Nickel and Chromium sputtered layers?

I have to etch a very thin film (50 nm) of Nickel ($\ce{Ni}$) on a 100 nm $\ce{SiO2}$/$\ce{Si}$ substrate. Additionally, there is a ~5 nm adhesion layer of $\ce{Cr}$ under the $\ce{Ni}$ that I'd also ...
5
votes
1answer
54 views

steam distillation of 4-bromoaniline , why render it basic prior

In the multistage synthesis of 4-bromobenzenamine, why must the solution be rendered alkaline prior to the steam distillation after the hydrolysis of 4-bromo-N-ethanoylbenzenamine?
3
votes
1answer
59 views

E2 reaction - strong base

In E2 reaction, there is more than one product. According to Zaitsev’s rule – “The alkene formed in greatest amount is the one that corresponds to removal of the hydrogen from the β-carbon having the ...
-5
votes
1answer
51 views

How to compare acidic strength of following organic compounds? [duplicate]

Why Acetic acid is weaker acid than benzoic acid?
5
votes
3answers
440 views

Calculating Buffer Capacity

I completed a titration of Ammonium Acetate buffer solution and to it I added 2M Hydrochloric Acid. I measured the initial pH of the buffer solution before any acid was added and I used methyl ...
4
votes
1answer
60 views

Water reacts or doesn't react?

I know that when you have $\ce{HCl}$, $\ce{H2O}$, and $\ce{NaOH}$ that you produce $\ce{H2O}$ and $\ce{NaCl}$. However some people say water does react and so would think that this 2 step reaction is ...
5
votes
2answers
97 views

Solvent effects on acidity of ethanoic acid

Is ethanoic acid most acidic in DMSO, water or methanol? I suspect that the conjugate base would be most stabilized by a polar protic solvent (meaning it's weakest in DMSO), however, water and ...