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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What is the best method to seperate phenol and benzoic acid?

Question: What is the best method to separate phenol and benzoic acid? I know that The phenol and Benzoic acid can be separated via their varying solubility, by heating the mixture in H2O to dissolve ...
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Acids and Bases (Buffers) [closed]

In order to create a buffer, you need to add conjugate acid to the base solution you created. How much methylammonium chloride would you have to add so that the concentration of the conjugate acid is ...
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20 views

What are some possible classification tests that one can use for o-nitrobenzoic acid?

I have analyzed an IR spectrum and found out that my compound (o-nitrobenzoic acid) has a nitro group, carboxylic group, and benzene ring. I was curious to know: if regioselectivity effects the ...
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Why is L-lysine only sold as L-lysine HCl and not as base (cf. L-arginine)?

Both L-lysine and L-arginine enjoy popularity as supplements, but only the latter is sold either as HCl or as base. Given that L-arginine is even more basic than L-lysine (pH 12.5 vs 10.5), that is ...
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1answer
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Does choline bitartrate react with hydrochloric acid?

Choline hydroxide is a base and reacts with HCl to form choline chloride salts and water. I am wondering if choline bitartrate can also neutralize HCl. In case it doesn't, is there any other cheap ...
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1answer
25 views

Non-toxic organic bases? [closed]

I am trying to find out if there are any non-toxic organic bases that could be given orally on a non-empty stomach to treat acidosis. From my research, histidine and diluted choline hydroxide were the ...
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1answer
51 views

Why is o-nitroaniline not more basic than aniline?

We know from SIR effect (Steric Inhibition of Resonance) that in o-nitroaniline, the nitrogen's p-orbitals will change their plane, causing the conjugation/resonance of its lone pairs to stop. So, the ...
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1answer
39 views

When adding HCl to aqueous sodium acetate, what are the products? [closed]

If I dissolve sodium acetate into water, I believe that the acetate ion and $\ce{NaOH}$ will be the products: But what happens when we add $\ce{HCl}$ to the solution/what will be the products and why?...
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1answer
52 views

Why are the acidities for H-CH3 and H-OH so different?

I was comparing the acidity of H-CH3 and H-OH, and a lot of things weren't making sense. Generally, the process of turning H-X into $H^{+}$ and $X^{-}$ can be broken into 2 hypothetical steps: 1.) ...
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1answer
29 views

Why does Cinnamaldehyde pass the ferric chloride test?

I was given some data to determine what an unknown compound was and figured out that the data was Cinnamaldehyde. After reviewing the classification test given to me by my professor, I was a bit ...
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1answer
32 views

Acidity order of organic compouds

Here is the question: We have to find the order of their acidity. Here is my thought process: We check the acidity order by finding which conjugate base is more stable. Thus we remove $\ce{H+}$ ...
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How to calculate the resulting concentration of sulfuric acid titrated with sodium hydroxide solution? [closed]

Calculate the resulting molarity if a $\pu{25.00 mL}$ sample of sulfuric acid ($\ce{H2SO4}$) was titrated with $\pu{ 27.35 mL}$ of $\pu{0.1093 M}$ sodium hydroxide.
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How to compare the acidity of this multicyclic hydrocarbon to the acidity of cyclopentadiene?

This is the question: Which one is more acidic? According to me, cyclopentadiene should have been the answer, as losing a proton would make it aromatic; whereas the first option doesn't need ...
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What are the names of acids and bases that differ only by an H + ion? [closed]

What are the names of acids and bases that differ only by an H + ion? I don't find the names
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Checking if a substance is a strong base [closed]

I want to check if a substance is a strong base or not. I have thought of 2 methods: 1. Check if the conjugate acid is weak. A strong base has weak conjugate acid. We can check this by adding $\ce{H+...
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1answer
28 views

How to evaluate the basicity of molecules? (Ethanamide and Ethanamine, Example) [closed]

Hi there i recently came in a position where was asked to evaluate the basicity of molecules, and managed to understand the heirachy of most molecules, however i couldn't figure out who was more basic ...
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Comparison of acidity of aqueous solutions of Lewis Acids

What can be the order of acidity of aqueous solutions of following Lewis acids: $\ce{FeCl3, AlCl3, BeCl2, NiCl2}$ The simplified reactions are: $\ce{FeCl3}$: $\ce{FeCl3 + 6H2O -> [Fe(H2O)6]^3+(...
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1answer
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Too much leftover in zinc sulfate reaction?

I'm doing a reaction of zinc metal and sulfuric acid to get zinc sulfate. I've been trying to learn the chemistry lately so I tried to measure out correct molar amounts. My understanding from the ...
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28 views

Valoration citrate and acid in syrup [closed]

If i have acid citric monohidrate (5/100), potassium citrate monohidrate (30/100), sodium benzoate(0.06/100), and percloric acid, i need to know the reaction in acuoso solution. My valoration of ...
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2answers
59 views

How can I calculate the amount of HF in aquoues solution of NH4F and an aquoues solution of NH4HF2?

Dissociation of $\ce{NH4F}$ and $\ce{NH4HF2}$ in water is complete, I assume: $$\ce{NH4F -> NH4+ + F-}$$ and $$\ce{NH4HF2 -> NH4+ + HF2-}$$ Can I calculate the amount of $\ce{HF}$ in these ...
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Is there a quick way to approximate a logarithm in Nernst equation?

The problem is as follows: In a galvanic cell the cathode is an $Ag^{+}(1.00\,M)/Ag_{(s)}$ half-cell. The anode is a standard hydrogen electrode immersed in a buffer solution containing $0.10\,...
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1answer
34 views

Auto-ionization equilibrium of water shifted with acid-base addition? [closed]

Adding acids or bases to water, so that either pH or pOH decreases independently of the other, will that affect the auto-ionization of water? For example, pure water + auto-ionized state, with some ...
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2answers
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Creating a buffer with with a target pH and given weak base?

I need to create a $100\textrm{mL}$ buffer of $\textrm{pH = 9.20}$ with ammonia and ammonium chloride such that $\textrm{pH = }9.20\pm0.50$ with $20\textrm{mL}$ of $0.2\textrm{M } \ce{NaOH}/\ce{HCl}$. ...
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54 views

What happens if the filter paper in vacuum filtration is BIGGER than the buchner funnel diameter? [closed]

I’m wondering what would happen if the filter paper in a vacuum filtration process is bigger than the buchner funnel diameter? I mean would some differences occurs? Or would the whole experiment ...
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1answer
143 views

What did Richter mean regarding an acid base reaction?

Recently I've been reviewing concepts belonging to the history of chemistry. But I came stuck at trying to understand a passage which I read from wikipedia entry (and which it seems has been mentioned ...
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2answers
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What does HClO2 aqueous solution decompose to in an open environment? [closed]

I looked up the decompositions of diluted $\ce{HClO2}$ aqueous solution (used in a disinfectant) to know if it is safe to use on some substances, such as metal, wood, leather or skin. However, the ...
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33 views

Why do amino acids exist as zwitter ions in the solid state? [closed]

I was going through the ionization of amino acids and came across the concept of zwitterions. I assume that zwitterion existence in the aqueous state is pH driven. Pka of cooh in amino acids is ~2 and ...
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2answers
59 views

Dissolving 304 Stainless Steel

We installed 20 2" drop in anchors to anchor several signs in place near the entrance of our pool. We have to remove the signs about twice a year and after the end of the past season, I noticed there ...
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1answer
33 views

Acidity order checking for α-furoic acid and acetic acid [closed]

α-Furoic acid's conjugate base is aromatic and hence is more stable. Then why acetic acid is more acidic than α-furoic acid?
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1answer
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Acidic and basic salts with ph indicator [duplicate]

Is magnesium sulfate an acidic, neutral, or basic salt? Which color will it show with the universal ph indicator? In my opinion it needs to be slightly acidic hence turns indicator yellow
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Use CaCO3 powder as antacid agent

A well known strategy for paper maintenance is to store it in a antacid enviroment (special boxes, envelopes etc.). There are also special preservation acid-free papers and archival material (...
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1answer
29 views

Naming acids, oxidation numbers and charges

I have been studying chemistry for a short time and studied the nomenclature of inorganic compounds. I got to naming acids, and got really confused with several things, including the definition of ...
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Comparing basic strength of acetamidine and 2-imidazoline

My approach: Conjugate acids of both molecules have the same number of stable resonance structures. So no conclusion from here. Conjugate acid of 2-imidazoline will have negative inductive on the ...
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1answer
55 views

Does Magnesium metal react with carbonic acid?

I use rainwater in my house for my water supply. I collect the water in plastic lined tanks. Some of my piping at home is copper, and I have blue stains in my shower, because I think the copper from ...
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3answers
71 views

Converting Lactic Acid to Potassium Lactate

I am looking to try an experiment incorporating potassium lactate into soap making. This seems to be new territory for soap makers in that sodium lactate is usually used. I found a bottle of "Lactic ...
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54 views

Why can't strong bases cleave ethers?

I'm imagining a strong base like NaNH2 attacking the adjacent carbon of the ether, giving the oxygen a lone pair and forming an alkoxide. NH3 has a pKa of 36 while an alcohols (conjugate acid of ...
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2answers
128 views

What is the difference between Half Equivalence point and Equivalence point?

OKay I learned in class that equivalence point is the time of neutralization, where the # of moles of acids and base present is in equivalence/same amount. Now I was also told that Half equivalence ...
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4answers
113 views

If sulphuric acid barely evaporates, why we can smell it? [closed]

If sulfuric acid barely evaporates, why we can smell it? Or does it give off sulfur dioxide gas?
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103 views

What is the oxidation state of Boron in Ammonia Borane? [closed]

So I was searching about the difference between redox reactions and Lewis Acid-Base reactions and came across classical example of latter, $$\ce{NH3 + BH3 \rightarrow NH3BH3}$$ Now in this example ...
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2answers
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Strength of weak acids and bases: Is methane better base than ammonia? [closed]

$\mathrm{p}K_\mathrm{a}$ of methane is $\sim 50$ and that of ammonia is $\sim 37,$ thus ammonia is a better acid than methane, which implies methane is a better base than ammonia. But I don't see how:...
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1answer
44 views

Why does a strong base completely neutralize a weak acid? [closed]

For the longest time, weak acid-strong base titration curves completely baffled me. I understood that the equivalence point of a strong acid-strong base titration is reached when equal numbers of ...
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55 views

Why is H2Te the strongest acid among the following?

Among H2S, H2Se, H2Te the strongest acid is H2Te. The reason being that the bond strength in it the weakest so it dissociates easily. But my question is that why does it looses H+ in first place ...
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35 views

How to determine the pH of citrate buffer system

I used this table (http://microscopy.berkeley.edu/Resources/instruction/buffers.html) to make a citrate buffer system. The Pka value is 6.4, and I multiplied the solution by ten to make a larger batch....
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437 views

Am I understanding buffering capacity against strong acid/base correctly?

I just want to make sure I'm understanding buffering capacity correctly. I've been working on this problem: Suppose you have an acetic acid buffer, $\mathrm{p}K_\mathrm{a} = 4.74$, at the ...
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64 views

Acidic strength comparison between sulphuric acid and nitric acid

Why is $\ce{H_2SO_4}$ more acidic than $\ce{HNO_3}$. Shouldn't it be the other way around because $\ce{N}$ is more electronegative than $\ce{S}$? My reason: $\ce{O}$ can take electrons more easily ...
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How do you find the ph of lime juice through titration?

I am doing an experiment on the effect of time on the pH of Lime juice. I was wondering how you would calculate the pH through titrations using 1 Molar NaOH. I have been racking my brain on this for a ...
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35 views

Trends in the acid strength of oxoacids

I was working on a problem regarding the relative acidity of oxoacids in the form $\ce{HYO3}$ where $\ce{Y}$ represents a group 17 element. The question (which is from a worksheet created by a ...
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2answers
56 views

How are CH3COOH molecules ionisied into H+ and CH3OO- [closed]

It's written in my chemistry book ,under weak acids, that the molecules of organic acids are partially ionised in water into ions. But I don't understand how molecules are ionised. I'm an ol ...
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2answers
89 views

Why is H⁺ ion considered the source of acidity, and OH⁻ considered the source of basicity? [closed]

As the title implies, what caused the association between $\ce{H+}$ and acidity, and between $\ce{OH-}$ and basicity?
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104 views

Gold refining using HCl

I am trying to dissolve base metals off of gold plated electronic scrap, and I am using HCl to dissolve some of the base metals. I pored in the HCl into a flask containing the scrap ( the contents of ...

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