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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9 views

Basicity of methyl and ethyl amines in NON-AQUEOUS medium [closed]

Is the order of the basicity of methyl-substituted amines and ethyl-substituted amines change the 'same' in an 'AQUEOUS' and a 'NON-AQUEOUS' medium?
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1answer
18 views

Difference between neutral and amphoteric oxides

What is actual difference between neutral oxides (eg:-NO , N2O , CO ) and amphoteric oxides(eg:-Al2O3). I got hint of it from comment of Ivan neretin Questions on Neutral oxides
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17 views

How do I separate glucose from a mixture of citric acid, tartaric acid and water? [closed]

How would I separate the glucose from that solution, mentioned above?
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42 views

Does aniline react with FeBr₃?

I have read that aniline does not undergo Friedel–Crafts reaction because it complexes with Lewis acid $\ce{AlCl3}.$ Will it also react with $\ce{FeBr3}$ during bromination (to receive a 3-bromo ...
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25 views

Why are alkali metal compounds like sodium hydride or sodium amide strong bases but weak nucleophiles?

I understand why compounds such as $\ce{NaH}$ or $\ce{NaNH2}$ are weak nucleophiles: as they aren't very soluble in organic solvents, they react only on the clusters' surface. But why are they strong ...
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8 views

Dissolving bronze inside of cast iron without disturbing the cast iron pipe [closed]

I have a pipe in my house that is blocked by a cast iron ring. I am not able to get to ring by conventional methods. I had an idea that I could dissolve the bronze with nitric acid, but was concerned ...
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16 views

Can a substance that is normally acidic become neutral? [closed]

How do I delete this question?
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21 views

Are there Brønsted–Lowry acids that are not Lewis acids? [closed]

I am trying to find a Brønsted–Lowry acid that is not a Lewis acid. Is this even possible? If it is possible, could you give an example?
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1answer
54 views

Easy way to make carbonic acid from other chemicals? [closed]

I would like to test for the reaction between carbonic acid and copper (to simulate the effect of acid rain on copper). However, I find that many supplies failed to provide carbonic acid (either in ...
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1answer
32 views

Why is CO2 more likely to dissolve in a basic solution than an acidic solution? [closed]

I'm having trouble thinking through this problem. I know that when $\ce{CO2}$ dissolves in water it can release $\ce{HCO3-}$ and $\ce{H+}$ and cause a drop in pH. But can I use this to justify why $\...
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15 views

Is it feasible to measure the pH of solution consisting of hydrofluoric acid, methanol and water using redox potential method?

Is it feasible to measure the pH of $\ce{HF}:\ce{H3COH}:\ce{H2O}$ solution using redox potential method? Can I use this method to calculate the $\ce{H+}$ ions in this solution and specifically, can I ...
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1answer
66 views

Equivalence point vs inflection point in the titration curve of a weak acid

Let's suppose we want to titrate a solution containing an unknown monoprotic and weak acid. We use a strong base, such as $\ce{NaOH}$. When the number (and moles) of hydroxide ions coming directly ...
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1answer
24 views

Ligand substitution reaction in coordination compounds

I know that the following substitution reaction can take place: $$\ce{[Cu(H2O)4]^2+ (aq) + 4NH3 (aq) -> [Cu(NH3)4]^2+ (aq) + 4H2O (l)}$$ This is because ammonia is a stronger ligand than water. ...
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2answers
111 views

Does H3CO3+ ion exist and what is its structure? [closed]

Why doesn't $\ce{H3CO3+}$ ion exist and why doesn't the carbonyl group in carbonic acid $(\ce{H2CO3})$ seem reactive?
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1answer
31 views

Can hydrogen peroxide be considered an alkali? [closed]

Hydrogen peroxide is miscible with water, can neutralize acids, and produces H2O, but I've never seen it labeled as an alkali, could we still consider hydrogen peroxide an alkali?
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38 views

Is contribution to pH by an acid or base always greater than salt hydrolysis?

I was solving a titration question and the reaction I came to was this: $$ \begin{array}{lcccc} \ce{&BOH(aq) &+ &HCl(aq) -> &BC(aq) &+ &H2O(l) }\\ \text{Initial} & x &...
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25 views

Acidity of 2-sulfopropanedioic acid in water

Sulfuric acid is a strong acid ($\mathrm{p}K_\mathrm{a}$ value below that of $\ce{H3O+}$: completely dissociated in water) at its first deprotonation, but is a weak acid ($\mathrm{p}K_\mathrm{a}$ ...
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1answer
58 views

Why is Aluminium oxide amphoteric?

I was reading my book, in which it mentioned that aluminium and gallium oxides are amphoteric and and Indium and thalium oxide are basic in their properties. But no explanation was given. Edit: My ...
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1answer
143 views

What is the most acidic neutral hydrocarbon?

This is a question I've been thinking about quite frequently. I had seen that this hydrocarbon has a low $\mathrm pK_\mathrm a$ with reference to the highlighted H-atom Loss of the central gives ...
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3answers
87 views

Acidity order of o-nitrophenol vs. o-chlorophenol [closed]

It is given that the above statement is true. Why does o-nitrophenol, in spite of intramolecular hydrogen bonding, have a lower $\mathrm{p}K_\mathrm{a}$ than o-chlorophenol?
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1answer
44 views

how can I measure the pH of a HF:H2O:CH3OH solution? [closed]

how can I measure the pH of a HF:H2O:CH3OH solution? more specifically, how can I precisely and accurately measure the H+ ion concentration?
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46 views

How does the relative acidity of 2,3-dinitrophenol compare to that of 2,4-dinitrophenol?

I am assuming that the -I inductive effect in 2,3-dinitrophenol is stronger than in 2,4-dinitrophenol since it operates through less bonds, therefore on inductive grounds it should have a lower $\...
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1answer
29 views

Ionization of hydrogens in hypophosphorous acid

Does anyone know why the hydrogen atoms bonded with phosphorus in $\ce{H3PO2}$ are not ionizable? I tried looking in high school level books, but they only describe the process, not the real reason. ...
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1answer
33 views

Order of magnitude of ions in water [closed]

My book says water has approximately $\pu{3.35E28 molecules/m^3}$ and that only a small part of water molecules are dissociated to $\ce{H+}$ and $\ce{OH-}$ ions and that the approximate amount of ...
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12 views

Rate Equation of Chemical Traffic Light (NaOH + Glucose + H20 + Indigo Carmine)

I am trying to find the Rate Equation of the Chemical Traffic Light Experiment. Wikipedia says the Blue Bottle Experiment (similar, but uses a different dye) has the following orders: The reaction ...
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2answers
41 views

Acidic strength order in gaseous phase

I got this question in my exam: Arrange the following in increasing order of acidic strength in gaseous phase (i) $\ce{CH3CH2COOH}$ (ii) $\ce{CH3COOH}$ I felt that increasing order must be (i)...
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2answers
40 views

Can I make a buffer with a weak acid without adding it's conjugated base, when the desired pH of the solution is exactly the pKa of the weak acid?

An acid will be 50% dissociated when the solution it's in have a pH equal to the acid pKa ('afirmation 1', for later reference). We also know that a good buffer solution have equal concentrations of ...
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2answers
92 views

why Ammonia is proton acceptor

I understand that this is an elementary question, but I tried to find answers which I could not get. I am trying to understand why Nitrogen in Ammonia is a proton acceptor. Now as I can see from the ...
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20 views

Ka for reaction from tables [duplicate]

For the reaction below: NH4+ + H2O -> NH3 + H30+ I have the following values from a table to use: And in the solution manual they tell me to use the Ka for this reaction. Why is this? Why do we ...
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2answers
112 views

Why acidity of p-methoxybenzoic acid is more acidic than p-hydroxybenzoic acid?

I know +M effect of $\ce{OCH3}$ is more than $\ce{OH}$, but in my book (ALLEN General organic chemistry), it is given that $\mathrm{p}K_\mathrm{a}$ of para-substituted benzoic acid containing $\ce{...
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1answer
141 views

What is the pKaH of pyrrole?

I am supposed to say what is more basic and I ran into a problem. I would like to ask if anyone has any idea what is the correct $\mathrm{p}K_\mathrm{a}\ce{H}$ value of pyrrole. I know it is easy to ...
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1answer
115 views

Can acid-base reactions occur in a non-aqueous medium?

To better illustrate my question, allow me to refer to the case of ammonium chloride, formed through a classic acid-base reaction. The reaction between ammonia and hydrogen chloride to give ammonium ...
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1answer
52 views

How to dispose of NaOH solution? [closed]

I have a range of sodium hydroxide solutions with different concentrations. (from 1.0 mol dm^-3 to 0.5 mol dm^-3). The max volume of each is 100ml. How can you easily dispose of these? Can I pour them ...
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100 views

Oxidation of certain acids by potassium permanganate

Why does potassium permanganate oxidize formic acid and oxalic acid, but has no reaction with benzoic acid and acetic acid? The reactions were heated in a water bath (~70-80 °C). Oxalic acid had ...
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1answer
82 views

pKa of phenols using UV-Vis spectroscopy

I have done an experiment where I dissolved four different substituted phenols in acidic, basic, and buffer solutions, and recorded the UV-Vis spectra for each. I'm supposed to pick a wavelength where ...
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0answers
60 views

What is the pH and pKa relationship of LaCl3 in water and its precipitant La(OH)3?

In light of this question and its answers, I hope to get some insights into the $\mathrm{pH}$ of $\ce{LaCl3}$ in water and its $\mathrm{pH}$ relationship to $\ce{La(OH)3}$ precipitant's $\mathrm{p}K_\...
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1answer
175 views

Show the acid nature of hydrogen sulfide

We are studying the chalcogens at school. I should prove (show) the acid nature of $\ce{H2S}$ by writing two chemical interactions. I am really sorry if the terms I am using aren't the right ones. It'...
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12 views

Acidic strength of phenol derivatives

While comparing the strengths of o-nitrophenol and p-nitrophenol, p-nitrophenol is found to be more acidic. The reason I studied for this is $\ce{H}$-bonding in o-nitrophenol which makes the acid more ...
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1answer
38 views

Reduction of amides with lithium aluminium hydride [closed]

Since $\mathrm{p}K_\mathrm{a}$ of primary amides are close to alcohols, will there be an acid-base reaction between amides and $\ce{LiAlH4}$ besides reduction?
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46 views

Hydronium ion concentration to compare pH values

I'm having a bit of trouble with this question: Which has a higher $\mathrm{pH}$ value, $\pu{0.001 M}$ $\ce{HCl}$ or $\pu{0.1 M}$ $\ce{CH3COOH}$ $(K_\mathrm{a} = \pu{1.8E-5})?$ I have calculated ...
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76 views

How can you use indicator titration to determine the pH of a complex solution like ocean water if at all

Could you measure the pH of ocean water by using a strong acid-weak base titration? I was thinking that you could set up a standard titration with ocean water as the "unknown", and drip the known HCl ...
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1answer
130 views

Mechanism for the reaction between trisilylamine and hydrogen chloride

In Concise Inorganic Chemistry by J. D. Lee (adapted by Sudarsan Guha), in the chapter "Chemical Bonding", under the topic "Back Bonding with Nitrogen as a donor atom" the following reaction is given: ...
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2answers
32 views

How do you know is a solution is acid or basic when you dissolve a weak acid/base? [closed]

If I dissolve the weak acid HCN into water, I get a solution of oxonium and CN ions and since there is an equilibrium there is more HCN left. So I thought CN ions can consequently react with water to ...
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36 views

How to calculate Revelle factor using only pH, DIC and TAlk for seawater?

I have the temperature, salinity, $\mathrm{pH},$ dissolved inorganic carbon (DIC) and total alkalinity (TAlk) values for an estuarine water sample. I want to calculate the Revelle factor. The Revelle ...
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3answers
79 views

Confusion on ion product of water

The ion product of water is defined as $$ K_w = [\ce{H+}][\ce{OH-}] $$ and in pure water $ [\ce{H+}] = [\ce{OH-}]= 1.0 \times 10^{-7}$ and $ K_w = 1.0 \times 10^{-14}$. It is said that if we dissolve ...
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2answers
101 views

Why aren't plastic bottles of coca cola full of microplastics?

My understanding is that disposable plastic water bottles should not be reused or used at all after some time, because the bottle will eventually leech microplastics into the water. Since coca cola is ...
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1answer
51 views

Acid-base titration: Unknown base in burette or flask?

While finding the concentration of $\ce{NaOH}$ via titration with $\pu{0.05M}$ Oxalic acid solution (in our lab) we put NaOH in the burette whereas added phenolphthalein to oxalic acid in titration ...
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1answer
56 views

When disolving a iron pill for titration, why do I use sulfuric acid instead of nitric or hydrochloric acid?

In a titration to decide the iron content of a pill we dissolved the iron in sulfuric acid and then titrated it with cerium(IV) sulfate. But I just wondered what's wrong with using nitric and ...
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1answer
36 views

The reaction of an oxyacid with water [closed]

I read in my book this: $$\ce{H2SO3 + H2O -> HSO3- +H3O+}$$ while I rather would write (not balanced): $$\ce{H2SO3 + H2O -> 2 H+ + SO3^2- + 2 H2O -> SO3^2- + 2H3O+}$$ I mean I don't ...
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1answer
43 views

Type of reaction between (+)-bis salt of (+)-phenylsuccinic acid and HCl [closed]

Im confused about what type of reaction occurs between the (+)-bis salt of (+)-phenylsuccinic acid and HCl. Would this be considered an acid base reaction or a neautralization reaction? MY THOUGHTS: ...