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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pH of the Highest Basic Substance [closed]

What is the pH of ortho-diethynylbenzene dianion? If I am correct, it is the most basic substance (superbase)
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How to find out equivalent to about 2 mg of sodium in sodium metabisulphite? [closed]

How to find out equivalent to 2mg of sodium in sodium metabisulphite? Please help to find out this problem.
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1answer
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Carbonic acid in pure water

In order to calculate the pH of pure water which is exposed to the atmosphere, we assume that the total concentration of carbonic acid in pure water is equal to the sum of dissolved carbon dioxide and ...
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2answers
46 views

Reaction of phosphorous acid (H3PO3) and potassium hydroxide (KOH)

For the reaction of phosphorous acid ($\ce{H3PO3}$) and potassium hydroxide ($\ce{KOH}$), write (a) the balanced molecular equation and (b) the net ionic equation. Note that phosphorous acid is a ...
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Are dehydrator sheets discolored by tomatoes safe? [closed]

I inherited an older tray-style food dehydrator along with dehydrator sheets from the 90s. I am not sure what the sheets I received are made of, but they became discolored by the tomatoes I dehydrated....
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comparision between basic nature of CH3O- and -OH

when comparing the basic nature of $CH_3O^-$ and that of $OH^-$. I found two arguments. one favoring the more basic nature of $CH_3O^-$ and the other favoring the basic nature of $OH^-$. so which of ...
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1answer
35 views

Reaction of Alkane RCOOH with KOH [closed]

The question is as follows: As much as 4.4 g of organic acid RCOOH is precisely neutralized by 200mL KOH 0.125 M.The molecular formula for the organic acid and the name of the acid compound with one ...
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1answer
27 views

Regarding salt hydrolysis of weak acid - weak base salt

For a salt made from a weak acid and weak base, say $\ce{NH4CN}$, my textbook represented hydrolysis at equilibrium by this reaction: $$\ce{NH4+ + CN- +H2O<=>NH3 + HCN}\\\text{ }\text{ }\text{...
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Will a salt dissociate completely in water to give free ions?

I was reading salt hydrolysis of a salt made from strong acid and weak base. I came across the hydrolysis of $\ce{NH_4Cl}$. These reactions were mentioned $$\ce{NH_4Cl + H_2O<=>NH_3 + HCl \tag{...
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How Is This Acid Base Map Established?

In the Acid-base map -shown below- each line denoted as an isohydric line shows the pairs of $ PCO_{2}$ & $ [HCO_{3}^{-}] $ that give a certain $ pH $. So each line connects the values of $ PCO_{2}...
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What the difference between these health-wise safe active ingredients? [closed]

I'm not a chemist. I just read different articles and try to make sense to myself. As I understood Hypochlorous Acid is naturally produced by our white blood cells. Therefore, it's safe (health-wise) ...
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Is it OK to dispose of potassium hydrogen phthalate into the sewer system?

I have been using potassium hydrogen phthalate (KHP) for creating primary standards. I have looked into the Flinn catalog, and the disposal consideration is classified as "organic acids, must be ...
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What makes concentrated aqueous solutions of aluminium nitrate and aluminium chloride suitable to dissolve noble metals, specifically gold? [closed]

Aluminium nitrate is a strong oxidising agent and aluminium chloride acts as a Lewis acid. Also these solutions are claimed to have the abilities of aqua regia and therefore can dissolve noble metals. ...
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1answer
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Does the acid dissociation constant takes hydrogen ions from water into account?

For the dissociation of a weak acid: $$\ce{HA(aq)<=>H+ + A-}$$ To calculate $\mathrm{pH}$ of a weak acid, we use the expression: $$K_\mathrm{a}=\ce{\frac{[H+] [A-]}{HA}}$$ The $\ce{[H+]}$ has ...
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How concentrated does sulfuric acid need to be for nitric acid synthesis (H2SO4 + nitrate salt distillation)?

So I have a home lab setup and recently found myself in need of some nitric acid. I could just buy some, but I thought it would be a useful exercise to make my own. I have plenty of nitrate salts ...
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This question is about Acids and bases [closed]

what does the underlined stuff even mean. this is an acid base topic and it is about calculating dissociation constant ka and kb. the thing that is confusing me is the underlined sentence. I don't get ...
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Are burns from Lye or Potash that bad?

I read that the chemicals potassium hydroxide and sodium hydroxide are extremely corrosive and will cause severe burns but I also see videos of people saying that if you get lye on you, then just wash ...
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titration - phenolphthalein

Phenolphthalein was the indicator used in the titration video. It is an appropriate indicator for the reaction because? This was in strong base/strong acid. a. it's colour change from colourless to ...
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2answers
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Unusual Titration Curve Explanation

From Costanzo's Physiology book in Acid-Base Physiology chapter, this titration curve of a weak acid ($\ce{HA}$), in the context of discussing buffers is provided: What confused me is that in this ...
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2answers
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What concentration of HCl is safe to smell? [closed]

I want to give students the chance to gently waft and smell HCl. What concentration would be considered safe for a once-off single waft and smell ?
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1answer
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How does an acid dissociate in water [duplicate]

I read somewhere that hydrogen cation combines with water to form hydronium ion. I also read it combines with various water molecules. Can someone please explain?
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1answer
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O-formyl benzoic acid or p- formyl benzoic acid. Which is more acidic?

As far as I can think, the ortho effect comes into play which makes o-formyl benzoic acid more acidic. But according to some, due to Hydrogen bonding between aldehyde and carboxylic group, hydrogen ...
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1answer
82 views

Is HCl a lewis base?

Cl in HCl has three lone pairs of electrons. So it can donate a lone pair and thus become a lewis base. Right? Just like water is called a lewis base because oxygen has 2 lone pairs and can donate a ...
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1answer
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Weak acids compared to strong ones in pH > 7 solution

In the book of Molecular Cell Biology (Big Alberts) by Alberts, at page 46, it is stated that Acids—especially weak acids—will give up their protons more readily if the concentration of > H3O+ in ...
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Dissociation constant for Indicators

So I came across a question which asked to calculate the $\mathrm{pH}$ at which an indicator of given $\mathrm{K_{a}}$ would change colour. The solution was given in the following way Since when the ...
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1answer
50 views

How does chromium behave in a carbonate solution? [closed]

I'm wondering how chromium (as a metal or as a salt) behaves in a concentrated carbonate solution. Will it form any, one or several carbonate specie(s)? Will the metal solubilize? How does it affect ...
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1answer
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Why are these H the most acidic?

I don't quite understand why these two hydrogens are the most acidic. From a hybridization perspective, these are connected to a $\mathrm{sp^3}$ carbon (I thought the more s character, the more acidic)...
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3answers
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What does *oxidizing* have to do with *hydrogen*? [closed]

An oxidizing acid is a Brønsted acid that is a strong oxidizing agent. All Brønsted acids can act as oxidizing agents, because the acidic proton can be reduced to hydrogen gas. (source: Wikipedia) ...
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Acidity of carboxylic acids

is there a reliable database with the pKa of halogenated carboxylic acids? I am also looking for the pKa of ethanoic acid substituted with other electronegative elements (like sulfur and oxygen).
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When the basicity of hydroxides of group 1A and group 2A increase down the group, why do we have NaOH as the strongest base? [duplicate]

When the basicity of hydroxides of group 1A and group 2A increase down the group, why do we have $\ce{NaOH}$ as the strongest base located at the top of group 1A? Shouldn't, if the trend is followed, ...
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1answer
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Effect on acidity of benzene due to electron withdrawing groups

With respect to the compounds I–V, choose the correct statement(s). Compound II becomes more acidic when it has a $\ce{-NO2}$ substituent. The acidity of compounds follows the order I > IV > V &...
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Fish Fertilizer acid / base reactions

Hi Everyone new to chemistry and learning lots but I had a question that I am having trouble working out. I work for a vegetable grower and we make our own fertilizer. My question is around the fish ...
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2answers
194 views

How to make acetic acid more volatile so that it can be removed by vigorous aeration of an acetic acid-water mixture? [closed]

I want to remove acetic acid from a mixture of acetic acid and water by aeration. The concentration of acetic acid is 200 ppm (mg/L). The pH of the water is more than 5. I want to reduce the acetic ...
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1answer
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Hydrogen and Hydrogen ion

Is it correct that a hydrogen atom only has 1 electron and 1 proton since the atomic mass is 1? Also, is the hydrogen ion composed of a single proton and no electrons? In an ionization process we know ...
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1answer
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Is Cu stable as Cu(H2O)2+ for determination on MP-AES? [closed]

I have an unknown sample of mineral which I need to dissolve in nitric acid. I need to analyze $\ce{Cu}$ from it on MP-AES. Do I need to add $\pu{1ml}$ of $\ce{HCl}$ to stabilize $\ce{Cu}$, or it is ...
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Comparing basic strength of phosphorus trichloride and phosphorus trifluoride

I need to compare the Lewis basic strength of trihalides of phosphorus My thoughts : Since fluorine is more electronegative, the percentage of $\mathrm s$-character in $\ce{P-F}$ bonds will be lower, ...
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1answer
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Modelling pH as function of time and position

I already posted this on the Engineering Stack Exchange under Chemical Engineering as I don't know where it's a better fit. I have a system whose initial state consists of three different sections ...
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1answer
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Acids and Bases (Spectator Ions Identification)

In an acid reaction with water, or other solvents, how do we know which atom(s) from a compound reacted with that solvent are the spectator ions? Are they the ones soluble in the solvent? Is the way ...
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Writing water as a reactant in acid/base dissociation (Brønsted Lowry)?

The dissociation of $\ce{HCl}$ in water is written as: $$\ce{HCl (aq) -> H+ (aq) + Cl- (aq)} \tag{1}$$ Sometimes we also include $\ce{H2O}$ as a reactant to stress the fact that the protons are not ...
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3answers
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The Curious Case of the equivalent weight

Please read the reference points given at the end. I understand the following about equivalent weight. Firstly it is given by, $Equivalent\:Weight= \frac{Molar\:Weight}{Valence\:Factor}$ And secondly, ...
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Arrhenius acids and bases

According to the Arrhenius definition of acids: An Arrhenius acid is any species that increases the concentration of hydrogen ions in its aqueous solution. Hydrogen Chloride gas ionises in water to ...
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IUPAC salt definition makes bases be classified as salts? [duplicate]

The IUPAC salt definition is: "A chemical compound consisting of an assembly of cations and anions" (Compendium of Chemical Terminology Gold Book, Version 2.2.3, 2014) So it means that a ...
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1answer
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Why isn't auto ionisation of water considered when we find the pH during salt hydrolysis?

$\ce{H+}$ concentration from the auto-ionisation of water is $10^{-7}$ If we have $\ce{HA}$ as weak acid and $\ce{BOH}$ as weak base having $\mathrm pK_\mathrm{a} = 3.2$ and $\mathrm pK_\mathrm{b} =3....
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Is an aqueous solution of potassium bicarbonate acidic or basic in nature?

The following is the definition of an acid salt according to my textbook: The salts formed by the partial replacement of the replaceable hydrogen atoms (H+ ions) of an acid molecule by a metallic or ...
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What are acid/base sensitive groups?

My textbook says that Clemmensen Reduction cannot take place in the presence of an acid-sensitive group and the Wolf Kishner reaction won't happen in the presence of a base sensitive group, citing $\...
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Why can't Grignard reagents react like Organolithium does (with acids)?

I'd read yesterday that Grignard reagents can't give ketones on reaction with carboxylic acids. It is because of the fact that Grignard reagent is a "super-base", and it will deprotonate the ...
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2answers
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Why is sodium bicarbonate added to lower the pH? [closed]

I use salicylaldehyde, chloroacetic acid and sodium hydroxide for the synthesis of o-formylphenoxyacetic acid. In the procedure it is written that after the reaction I need to add sodium bicarbonate ...
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1answer
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Why is aniline more basic than pyrrole?

In a question asking to compare the basicity of pyrrole and aniline, the explanation given for aniline being more basic than pyrrole was as follows: Basicity depends on the availability of lone pair ...
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2answers
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Reaction of copper with nitric acid [duplicate]

When copper reacts with dilute nitric acid, $$\ce{3Cu + 8HNO3 -> 3Cu(NO3)2 + 2NO +4H2O}$$ while with concentrated nitric acid, $$\ce{Cu + 4HNO3 -> Cu(NO3)2 + 2NO2 + 2H2O}$$ As we see that with ...
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19 views

How does concentration of H3O effect the concentration of OH [duplicate]

I know that [H+][OH-] will always equal 10^-14 in 25c water, however, I would like to know why that is, like if there is an extremely small amount of both H+ and OH- in the water how would increasing ...

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