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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Is barium peroxide a salt?

I reviewed the definition of salt, a product of base and acid. I found a chemical equation between barium hydroxide and hydrogen peroxide yielding barium peroxide. I also find a journal article ...
user144151's user avatar
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Change in pH/acidity of vinegar after adding aqueous NaCl

There's a question in my (grade 10) textbook asking to determine what will happen to the pH/acidity of vinegar if a solution of sodium chloride in distilled water is added to it drop by drop. The ...
Abhinav Sood's user avatar
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1 answer
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Find the pH of a solution obtained by mixing 100 ml 0.1m Na3PO4 and 100 ml 0.1 M NaH2PO4. Given that H3PO4: [Κα₁ = 10^-4, Κα₂ = 10^-7, Каз = 10^-11]

So, my query is that since NaH2PO4 is a weak acid, and Na3PO4 is a basic salt, wouldn't they react? Another theory was that since NaH2PO4 is a weak acid and Na3PO4 is a salt of strong acid and NaH2PO4,...
qwqwqwerty-7's user avatar
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1 answer
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Can phosphorous penta hydroxide [P(OH)5] exist? [closed]

I was looking at the oxyacids of Phosphorous and it is given that (in Wikipedia article of "Phosphorous acid"), some of these acids (Eg: $H_3PO_2$ and $H_3PO_3$) exist in a dynamic ...
Bharat Karri's user avatar
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How do I use the Henderson-Hasselbach equation? [closed]

Calculate the final pH of a solution made by the addition of 10 mL of a 0.5 M NaOH to 500 mL of a 0.4 M buffer solution originally at pH = 5.0 (pKa = 5.0) Neglect the volume change.
user144063's user avatar
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Titration of CaC2O4 from kidney stones [closed]

Is this a good idea for a final experiment in analytical chemistry? And how much (grams) kidney stones would I require in order to perform it?
Ana Iljoska's user avatar
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What is happenning with that single hydrogen in Phosphorous acid?

As an oxyacid, Phosphorous acid intuitively should have the structure since the hydrogens should be on the oxygens. However, the major form of this acid is actually with the hydrogen attached to the ...
Captain Chicky's user avatar
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Muriatic acid evaporated [closed]

Three bottles of muriatic acid (for pool) weeped in cold weather (single digits Fahrenheit for about a week), leaving wetness (liquid, not dampness) on concrete basement floor under and adjacent to ...
allan marquardt's user avatar
1 vote
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Aquatic chemistry, pH and alkalinity

Hope you can help me with an aquatic chemistry question. I have different types of water of different pH and alkalinity. pH, alkalinity, HCO3 and CO2 concentrations are known. I need to calculate the ...
Nathan's user avatar
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Dissolve gold but not nickel

I am trying to remove gold plating from a nickel base. What acid would dissolve gold but would not dissolve nickel?
Wonka's user avatar
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Why doesn't acid dissociation always have K>1?

Acid dissociation is usually exothermic, and it has an increase in entropy, so the change in Gibbs free energy should be negative. So why isn't always $K_\mathrm{a}>1$ in accordance with $\Delta G^...
unstable's user avatar
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Synthesis of indoles from 2,4-DNPH (fischer indole synthesis)

I am unable to find any data at all about conversion of 2,4-dinitrophenylhydrazones into their indoles through Fischer method. Can you give me some links for its procedure.
Muhammad Ali's user avatar
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Safety of lye mist? [closed]

Lye solution(NaOH) has been shown to absorb carbon dioxide from the air. It reacts with carbon dioxide to form water: $$\ce{2 NaOH + CO2-> Na2CO3 + H2O}$$ The sodium carbonate produced then reacts ...
interestedperson's user avatar
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1 answer
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What is the pKa of choline chloride?

I am looking for the pKa of choline chloride, which should be higher than 7 (around 10?), but I cannot find any reference value.
David Moldes's user avatar
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pH value of a strong acid, and why [closed]

I've been experimenting with random things on the material of pH in a matter of the ones that we consider "strong" acids and bases. I've been told in my school that the way to find $\ce{[H+]}...
Kenneth Albert's user avatar
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1 answer
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How does increased polarity of O-H increase acidity? Shouldn't it reduce it as bond strength increases?

A polar bond will be stronger than a relatively less polar bond. So how does increasing polarity of O-H bond ever increase acidity. Shoudn't it make it harder to release H+ and become less acidic.
Mohammed Hamza's user avatar
7 votes
2 answers
563 views

Question about the differences of white and grey NaH properties

We are having some problems with the next reaction in our lab. As you can see, is the sulfonylation of an indole in which we use NaH (60% dispersion in mineral oil) as a base. This reaction goes with ...
Alicia's user avatar
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Acid base titration molar ratio [closed]

Consider the following neutralisation reaction: $$ \ce{2HNO3 + Ba(OH)2 -> Ba(NO3)2 + 2H2O} \tag{1} $$ I would be glad for help in how to solve this problem with $c_1V_1 = c_2 V_2$, because the ...
Miiky's user avatar
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Common Ion effect with sulphuric acid

Sulphuric acid dissociates completely (H2SO4 -> HSO4⁻ + H⁺). Its product HSO4⁻ has a pKa of 1.92 which should then dissociate partially into SO4²⁻ and H⁺. I was trying to find out the pH of a 0.05M ...
David's user avatar
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Question on electron density

I was working with ammonia ($\ce{NH3}$) and phosphine($\ce{PH3}$). Both have lone pair electron. But $\ce{NH3}$ is stronger base (Lewis base) than $\ce{PH3}$. I was told by my instructor that it is ...
Himalayan's user avatar
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1 answer
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Why is the ionic product of water also the equilibrium constant of dissociation of water?

This answer presents a derivation of the value of ionic product of water at $25^{\circ}\text{C}$. The relation $K_\text{eq} = \operatorname{e}^{-\frac{\Delta_\text{r}G^{\circ}}{RT}}$ is used for the ...
Thecoder001's user avatar
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1 answer
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Is boric acid aqueous solution corrosive to stainless steel? [closed]

I'm thinking of trying an aqueous boric acid solution in a nebulizer for a sinus infection, in a similar strength as for eyewash (anywhere from 1 tsp. in 4 oz. to 1 tsp. in 32 oz.). My nebulizer has a ...
Marilyn's user avatar
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Making Sodium Citrate

I've been trying to make Sodium Citrate and I've seen online people saying just react sodium bicarbonate with citric acid in water (with correct ratios) and boil off/remove water once the reaction has ...
James Hamp's user avatar
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1 answer
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How long would it take fluoroantimonic acid to melt through a tiger's body? [closed]

I'm writing a story in which a character throws a knife containing fluoroantimonic acid contained within hydrofluoric acid, which is itself contained within fluorinated plastic, into a tiger's mouth. ...
JaneDoe24's user avatar
2 votes
0 answers
412 views

Why is the lysine side chain more basic?

As per PubChem: $pK_1 = 2.18$; $pK_2 = 8.95$; $pK_3 = 10.53$ at 38 °C, indicating that the side chain amino group is deprotonated at a higher pH, indicating it is more basic. I tried to justify this ...
Sid's user avatar
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3 answers
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Why are buffer solutions not neutral

I am very confused about buffer solutions and I have lots of ideas about them which don’t integrate together so I really can’t tell which are correct and which are wrong. That being the case it’s ...
QuantumHamster's user avatar
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2 answers
135 views

Can carbonic acid form a salt with pH < 7?

Please read edit before answering Background I am currently studying in 10th grade. This question appeared in my science exam - Which acid does not form an acidic salt? Phosphoric acid Carbonic acid ...
GameTime With Aryan's user avatar
2 votes
1 answer
230 views

Effects when 100 mmol NaHCO3 are mixed with 50 mmol HCl

I read somewhere that when $\pu{100 mmol}\ \ce{NaHCO3}$ are mixed with $\pu{50 mmol}\ \ce{HCl}$, a buffer arises. I'm confused, since $\ce{HCl}$ is a strong acid, and I thought the classic buffer is ...
chsimmons1's user avatar
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1 answer
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Determination of the composition of the mixture based on acid-base titration

The solution can contain $\ce{HCl}$, $\ce{H3PO4}$ or $\ce{NaH2PO4}$ individually or in all possible combinations. An aliquot of $25.00\,\text{mL}$ of this solution consumes $14.56\,\text{mL}$ of $0....
crvenikupus's user avatar
-2 votes
1 answer
117 views

What will be the preferred reaction between phosphorous acid (H3PO3) and potassium hydroxide (KOH) [closed]

""To neutralize completely $\pu{20 mL}$ of $\pu{0.1 M}$ aqueous solution of phosphorus $\ce{H3PO3}$ acid the volume of $\pu{0.1 M}$ aqueous $\ce{KOH}$ solution required is: ____"" ...
Rajesh Paul's user avatar
0 votes
1 answer
66 views

Basicity of pyridine and 2,6-di-tert-butylpyridine

Among pyridine and 2,6-di-tert-butylpyridine, which one would be more basic? My guess was that since two bulky groups are substituted at ortho position in the latter, it will experience steric ...
Ayanokouji Kiyotaka's user avatar
3 votes
1 answer
102 views

Acidity of H4P2O7 and H3PO4

As given in pKa of H4P2O7 and H3PO4. The acidity of pyrophosphoric acid is clearly stronger than phosphoric acid. The two acid structures is given below. Thought: Consider the pyrophosphoric acid ...
Shira's user avatar
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4 answers
116 views

Is NaCl precipitation possible in this mixture?

Consider the following mixing of solutions: $$\ce{HCl(aq) + NaOH(aq) -> NaCl(aq) + H2O(l)}$$ My chemistry book says that this equation is quite correct, especially in the sense that $\ce{NaCl}$ is ...
AlgebraicsAnonymous's user avatar
2 votes
0 answers
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Is the amine nitrogen of methylglycinediacetic acid (MGDA) protonated?

MGDA is a tertiary amine with 3 acetic acid groups. I would like to know whether the amine Nitrogen of MGDA is protonated or not for a given pH value. I could not find any literature data which ...
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Cyanoacrylate glue and citric acid

I got some cyanoacrylate glue on my fingers yesterday which dried up quickly and would not fall. My daughter (n.b. she's 7th grade, no chemistry education but wants to be a chemist and reads a lot by ...
ivan's user avatar
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1 answer
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Is it possible to make acids and bases in amphiprotic solvents other than water [closed]

In such solvents, could there be chemicals which could donate/accept protons, and if so could their solutions display acidic/basic properties?
Mark R's user avatar
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1 vote
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Stability of H3MnO4, H2MnO4, HMnO4

I cannot seek out the reason why while $\ce{H3PO4}$ (phosphorus oxidation +5) is relatively stable and obtainable but $\ce{H3MnO4}$ (the same oxidation state +5) is rarely mentioned and perhaps ...
Shira's user avatar
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1 answer
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Does hydrogen chloride gas react with metals?

I searched and couldn't find any reactions with $\ce{HCl (g)}$ as a reactant, only with the acid in the aqueous phase ($\ce{HCl (aq)}$). Do metals react with $\ce{HCl}$ gas to form hydrogen?
Piezo's user avatar
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Ca(OH)2 not dissolving even as much as it should

according to solubility charts Ca(OH)2 should dissolve at 20-25 oC at about 1.6g per litre. I have tried 0.8, 0.4 and 0.2g in 500ml and even the 0.2 does not completely dissolve, even left overnight. ...
Shaun Nagy's user avatar
1 vote
0 answers
72 views

Why is quinuclidine more basic than triethylamine? [duplicate]

I am trying to compare the basic strength of two similar amines Usually this is done by comparing the relative stability of the ion formed on the protonation of nitrogen's lone pair. This can be done ...
mark's user avatar
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2 answers
152 views

Can a multimeter be used to measure PH?

I would like to feed my garden a solution of water and Trisodium Phosphate (TSP), but I am uncertain of the correct amount of TSP to water ratio. Too acidic or too basic of a solution can harm my ...
user148298's user avatar
0 votes
1 answer
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How do I find pH of an extremely low molarity strong acid? [duplicate]

Given $$[HNO_{3}] = 4.53(10)^{-10},$$ find the pH of the acid. $K_{a}$ is not given, and it is at 25 degrees celsius. Because the molarity is very low, as in less than 10^-6, the teacher tells us that ...
Bob's user avatar
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3 votes
1 answer
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crystalline form of HCl

HCl is a covalent compound. I do not understand why HCl cannot exist as an ionic compound with the combination of hydrogen ions and chloride ions. Is it a matter of electronegativity? I have once ...
Freeby Freeby's user avatar
3 votes
0 answers
97 views

Hydrolyse Phosphonate diester to free phosphonic acid under relatively mild conditions?

I want to hydrolyse a phosphonic acid diethylester to the corresponding free phosphonic acid. In the literature, it is described, that usually strongly basic or acidic conditions are utilized to ...
raptorlane's user avatar
-3 votes
1 answer
170 views

Production of sulphuric acid

To my knowledge, sulphuric acid is produced by complex industrial processes like contact process. The following structure shows a sulphate ion. I wonder why sulphuric acid cannot be produced through ...
Freeby Freeby's user avatar
2 votes
0 answers
75 views

Why do buffer solution only maintain pH to a certain limit?

I know that buffers have a capacity after which they are not able to maintain a relatively stable pH. This capacity is exceeded when we add too much acid or base but I was wondering why does this ...
Spluesh's user avatar
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2 votes
2 answers
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Calculating the pH after adding hydrochloric acid to the potassium hydrogen phosphate solution

I am trying to calculate the $\mathrm{pH}$ of a solution obtained by mixing $\pu{20.00 mL}$ of $\pu{0.2 M}$ potassium hydrogen phosphate solution and $\pu{10.00 mL}$ of $\pu{0.25 M}$ hydrochloric acid ...
crvenikupus's user avatar
0 votes
2 answers
124 views

dilution and pH and pOH

The question is: given a $10$ ml solution with pH = $12.3$, which is then diluted to a $100$ ml solution, find the pH of the new solution. My attempt was as follows: [H$_3$O$^+$] = $10^{-12.3}$, and $...
Martin Westin's user avatar
-2 votes
2 answers
121 views

Why this Lewis structure for HNO3 nitric acid is wrong? [closed]

I know that this Lewis structure of HNO3 is wrong, but I don't know the reason why, except that here the side atoms (oxygen) are connected via a bond. This structure fulfills the octet rule and also ...
Filiana's user avatar
4 votes
2 answers
610 views

Acidity of metronidazole

Metronidazole has two $\mathrm{p}K_\mathrm{a}$ values: $2.57$ and $15.42.$ The basic group is the imidazole moiety. Does metronidazole have acidic groups?
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