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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 makes a compound basic?

Aluminum chlorohydrate is often referred to as basic aluminum chloride. The pH value of ACH is about 4. How is basicity in this context defined?
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How do I go about either finding or calculating Aluminum-Oxalate salt solubility values in aqueous medium?

Water would contain other salts which may complicate things a bit. But finding out the Aluminum-Oxalate salts solubility values in pure water would be a good indicator already. It's for temperatures ...
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1answer
24 views

is every molecule either a base or acid

I read today that water is a base because it can receive a proton when mixed with some acids. That got me thinking: is every single molecule capable of either donating or receiving a proton -- when ...
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0answers
18 views

Evaluate indicator choice (phenolphthalein)

A student wishes to find the concentration of a $\pu{50 mL}$ solution of acetic acid $(K_\mathrm{a} = \pu{1.8e-5}).$ He performs a titration using a solution of $\pu{0.2 M}$ sodium hydroxide. The ...
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0answers
28 views

Can a strong base (in this case Sodium Hydroxide) be effectively weakened ie: safe without the neutralization of it? [on hold]

I wish to figure out If I can retain Sodium Hydroxides ability to hydrolyze fats yet allow it to be safe to humans. I was curious if it were possible without the neutralization of the base.
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22 views

Difference between Ascorbate & Semi-DHA (both C₆H₇O₆)

I wanted to know how Sodium Ascorbate functions in the AA family of molecules. However, all normal routes lead to dead ends (typically AA). Forcing NCBI to search only for Sodium Ascorbate mostly ...
13
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2answers
2k views

How to remove stain from pavement after having dropped sulfuric acid on it?

I had this car battery that flipped in my car trunk. When I got it out of there it spilled some acid on the pavement. It's a sulfuric acid battery. I added some baking soda on it and poured some more ...
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1answer
31 views

Order of acidic strength of oxides

Select the correct order of acidic strength of oxides: (A) $\ce{SO2} > \ce{SO3} > \ce{CO2}$ (B) $\ce{Cs2O} > \ce{K2O} > \ce{Na2O}$ (C) $\ce{CO2} > \ce{N2O5} >\ce{B2O3}$...
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2answers
54 views

How do we know if a compound is amphoteric or not?

My teacher told me if it reacts with an acid and a base, then the compound is amphoteric. However, I am not satisfied. Is there any other way of telling? For example we are give a compound say BeO, ...
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0answers
31 views

Polar Protic and Aprotic Solvents

I know $\mathrm{S_N2}$ is favored polar aprotic solvents, which means that they may have hydrogens on them somewhere, but they lack $\ce{O-H}$ or $\ce{N-H}$ bonds, and therefore cannot hydrogen bond ...
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0answers
27 views

Acid and base separation on an anion exchange column [on hold]

I'm new with this concept and so I would need some advice. I want to separate an acid and a base in a water solution. The acid has $\mathrm{p}K_\mathrm{a}(\ce{HA}) = 5$ and the corresponding acid of ...
6
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2answers
230 views

How are neutral amines effective bases in organic chemistry?

I have found it to be rather strange that neutral amines, such as triethylamine or DIPEA, find applications in organic chemistry in deprotonating alcohols or even α-carbonyl compounds. Amines are ...
2
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0answers
23 views

Hydrolysis of an amidine derivative under acidic conditions

I know that an imine can undergo acid hydrolysis to yield a corresponding amide: https://chem.libretexts.org/@api/deki/files/13283/10.jpg?revision=1 But I am looking at a mechanism for acid ...
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0answers
24 views

Coupling Reaction

I have an antibody with primary amine one terminal end. I want to couple it with liposomes containing DSPE-PEG-Maleimide. What are possible conditions of reaction and is it possible to attach this ...
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0answers
51 views

Calculate the pH

Calculate the pH of a dissolution of 100 ml of 0.1 M solution of ammonium chloride in the style of 100 ml of 0.1 M hydrochloric acid solution $\ce{NH4Cl -> NH4+ + Cl-}$ $\ce{HCl -> H+ + Cl-}$ ...
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0answers
17 views

Aquaregia reaction time [closed]

In what time does aquaregia dissolves metals? If the time differs with different metal, on what factors does the time varies?
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0answers
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How do I go about calculating which of several carbonates would most easily decay when exposed to an acid?

For instance, I'd want to compare CaCO3, ZnCO3, MgCO3, etc and find out which one will decay with the least amount of an acid? Which laws / principles are involved that I'd need to find out how to ...
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2answers
44 views

Is this balanced redox equation correct? [closed]

I'm trying to balance an equation using oxidation numbers $\ce{MnO4^- + H+ + Cl- -> Mn^2+ + Cl2 + H2O}$ my suggestion: $\ce{MnO4- + 8H+ + 5Cl- → Mn^2+ + 2.5Cl2 + 4H2O}$ the 2.5 $\ce{Cl2}$ is ...
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1answer
35 views

Titration of aspirin

I have performed an experiment to test how temperature affects how fast aspirin dissolves by titrating solutions at various time intervals. According to this website, aspirin reacts with water as such:...
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1answer
21 views

How do I calculate the proportion of respective conjugates of one base mixed with several acids (and/or conversely) at different temperatures? [closed]

How do I calculate the proportion of respective conjugates of one base mixed with several acids (and/or conversely) at different temperatures, and is there a free software tool that would allow me to ...
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3answers
49 views

4-Bromophenol vs 4-aminophenol pKa in water comparison confusion

Recently the other week, I was asked the following question: Would you expect 4-aminophenol to have a higher or lower pKa than 4- bromophenol when measured in water? And I thought about this on ...
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0answers
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Identification of Acid,Base [closed]

Why $\ce{AlCl3}$ being an acid on dissolving in aqueous solution did not give $\ce{H+}$ ion?
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0answers
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What makes copper(ii) oxide so special that it can't react with water but only in strong acids? [closed]

I heard there's something weird about copper as well, but I tried to search up everywhere with no answers turning up. Does anyone know why?
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0answers
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Why doesn't HCl acid inside our stomach corrode stomach walls if its pH is 1? [closed]

Our stomach has $\ce{HCl}$ acid of pH 1 inside. Acids are corrosive in nature. so, how are we still alive holding strong acid of pH 1 inside our body. why is this acid not affecting us?
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1answer
36 views

What should be the molarity of HCl and H2SO4 acid so that they can be considered safe to touch? [closed]

I know $\ce{HCl}$ and $\ce{H2SO4}$ acid of concentration 17 M is dangerous and corrosive, but I wonder can we dilute these acids to the extent that they become safe to touch? If yes, then what should ...
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2answers
52 views

What atom would be protonated first in a strongly acidic solution?

The answer is A. I thought it would be D since the ester group has the highest pka and the more basic functional group would be more prone to protonation. Also, I don't really get how to rank C in ...
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1answer
98 views

Calculating pH when weak base is added to an strong acid

$\ce{NH3}$ solution of $\pu{0.1 mol dm-3}$ is being added to a $\pu{25.0 cm3}$ of $\pu{0.1 mol dm-3}$ $\ce{HCl}$ solution. Calculate the pH of the solution when volume of added $\ce{NH3}$ solution is $...
2
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1answer
46 views

Can I use litmus paper to test unknown liquid that contains a concentrated strong acid?

Can I use litmus paper to test unknown liquid that contains a concentrated strong acid (example $\ce{H2SO4}$)? Can concentrated strong acid destroy litmus paper?
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1answer
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Will strong concentrated acid destroy litmus paper and pH paper if they are dipped in acid?

I am curious to know what will happen if I have litmus paper and pH paper, and I dip them into strong concentrated acid like conc. $\ce{H2SO4}$ to test its acidity or basicity. Will acid destroy ...
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2answers
25 views

Can a low concentration of an acid disolve solids just as well?

I'm in the process of removing some hard water stains with vinegar. It's not working so well. The stains are in a large fish tank, which I have filled with water and vinegar. I would expect a lower ...
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1answer
33 views

Ammonium chloride in aqueous solution

When Ammonium chloride is in an aqueous medium its cation part ammonium undergo hydrolysis. Since ammonium is conjugate acid of a weak base it readily release one $\ce{H+}$ and converts back to $\ce{...
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1answer
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How to find the strongest base using stability arguments

Answers: The most acidic is D and the most basic is A. So first off I compared A with B: I'm kinda confused on this. I looked at the base NH one and saw that when it was protonated it lost its ...
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0answers
53 views

Can Acids have pH of more than 7? [duplicate]

Consider a solution of $\text{HCl}$ with a concentration of $10^{-10}$ $\text{M}$. Now, if I find it's pH: $$\text{pH} = -\log([\text{H}^+])$$ $$\text{pH} = -\log(10^{-10}) = 10$$ At room temperature, ...
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1answer
53 views

How do I write a procedure for creating a buffer?

I need to write an original procedure with exact numbers for creating a buffer: Create a buffer using $\ce{CH3COOH}$ and $\ce{CH3COONa}$ that has a $\pu{pH}$ of exactly $3.75$. A $\pu{50 mL}$ ...
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0answers
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Why is indane more acidic then Fluoren? [duplicate]

While researching for pKa values in Bordwell pKa Table (Acidity in DMSO) , i found the following PKa values of Fluoren and indane . $\ce{^1 ^2}$ Fluoren conjugate base is structure 1. Indane's ...
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1answer
40 views

Acid etching of float glass

While we have done some etching of glass with hydrofluoric acid alone, to achieve a matte white finish on float glass, I am curious to know what formula and procedure is required to create a more ...
5
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1answer
86 views

Why is the dissociation reaction of acetic acid in water initially endothermic and then exothermic?

Why is the dissociation reaction of acetic acid in water initially endothermic as temperature is increased and then becomes exothermic as it is increased further? My understanding from Le Chatelier's ...
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1answer
54 views

What is the pH at both equivalence points of titration between diprotic tartaric acid and NaOH?

Here's all the info I have and my attempt in solving the question: The chemical equation for the titration: $$\ce{C4H4O6 + 2NaOH -> Na2C4H4O6 + 2H2O}$$ Here are the 1st and 2nd $\mathrm{Ka}$ ...
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1answer
107 views

How to create a buffer using CH3COOH and CH3COONa that has a pH of exactly 3.75?

I need to create a buffer using $\ce{CH3COOH}$ and $\ce{CH3COONa}$ that has a pH of exactly $3.75$. A $\pu{50 mL}$ sample of your buffered solution will have to be able to withstand the addition ...
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1answer
39 views

Is barium sulfate soluble in dilute mineral acid?

I have read that $\ce{BaSO4}$ is soluble in $\ce{HCl}$ , but I am not sure whether this works for dilute acid as well. The reaction is - $\ce{BaSO4 + 2 HCl ->BaCl2 + H2SO4}$
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1answer
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When will acid-base reactions occur before substitution reaction

For example, given the reaction below: The substrate is secondary, the solvent is aprotic and it is to react with a strong bulky base. From this, I assumed that the reaction would be $\ce{E2}$. ...
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0answers
39 views

Can a cation form a bond with only the oxygen in hydroxide ion?

$$\ce{Al2O3 + 2 NaOH → 2 NaAlO2 + H2O}$$ In this reaction between an amphoteric oxide and a base, I do not understand how $\ce{Al}$ makes a bond with oxygen atoms since the water is found in the ...
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0answers
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Create a buffer using CH3COOH and NaCH3COO that has a pH of exactly 3.75.? [closed]

a 50 mL sample of your buffered solution will have to be able to withstand the addition of 25.0 mL of 0.100 M NaOH solution. the buffered solution will break after the addition of no more than 35.0 ...
5
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0answers
76 views

Why is there no effective alternative to metal salts in antiperspirants?

Metal salts, especially aluminum compounds are used in antiperspirants to prevent sweating. I found out aluminum chloride hexahydrate, which is found in most antiperspirants, undergoes an acid-base ...
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2answers
57 views

Which of the following is the most basic compound?

Which of the following is the most basic compound? $\ce{HS-}$ $\ce{H3Si-}$ $\ce{H2P-}$ $\ce{Br-}$ I can't figure out which of these is the strongest base. Would it be $\ce{H3Si-}$, ...
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1answer
50 views

Calculate the pH of buffer solution

PROBLEM: A solution was prepared by mixing $\pu{25.00 mL}$ of $\ce{NaOH}$ $\pu{(c = 1mol/L)}$ and $\pu{10.00 mL}$ of acetic acid $\pu{(c = 2.5 mol/L)}$ in water to give $\pu{250 mL}$ of solution. ...
3
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1answer
31 views

Acid-Base Reaction in MacGyver Episode “Countdown”

This question is about the old MacGyver show, Season 1, Episode 14, "Countdown." Could someone please explain how/why MacGyver neutralizes the acid in the bomb? He claims it is an electrolyte switch, ...
1
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1answer
44 views

Why is the pH level of carbonation loss decreasing then increases afterwards?

We have done an experiment of the titration of unsealed sprite soda to find the amount of carbonic acid being loss on various duration (0 to 1 hour), due to decrease pressure. The calculation was to ...
0
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1answer
41 views

Reaction between an acid and acid

My initial thought was that the stronger acid will act as an acid and the weaker acid as base like the reaction between $\ce{H2SO4}$ and $\ce{HNO3}$ but in this reaction there is a lone pair available ...
0
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1answer
32 views

Difference of Ascorbic acid dissolved or precipitated in Glycerol?

Difference of Ascorbic acid (AA) dissolved or precipitated in Glycerol? Referring to pat US20110008445A1 Solution 1 At 25C, AA was dissolved in glycerol and alcohol (subsequently removed by ...