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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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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
1 vote
1 answer
59 views

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
124 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
89 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
5 votes
2 answers
176 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
  • 568
-2 votes
4 answers
128 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
38 views

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 ...
VKM's user avatar
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2 votes
0 answers
62 views

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
  • 121
-4 votes
1 answer
60 views

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
2 answers
185 views

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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-5 votes
1 answer
99 views

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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0 votes
0 answers
34 views

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
81 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
  • 201
-3 votes
2 answers
253 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
79 views

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
  • 19
3 votes
1 answer
226 views

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
106 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
191 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
82 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
64 views

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
149 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
143 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
652 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?
user139229's user avatar
3 votes
1 answer
144 views

Are there LCMS compatible buffer systems available for the high pH range 12-14?

I want to perform chemical stability studies for different pH Values. To achieve pH Values from 1 to 6 I can prepare solutions with trifluoric acid and formic acid and ammonium formate and acetate. I ...
raptorlane's user avatar
-4 votes
1 answer
75 views

How does adding sulfuric acid to water affect the specific heat capacity of the solution? [closed]

How does adding diffrent concentrations of sulfuric acid to water affect the specific heat capacity of the solution?
user138990's user avatar
-4 votes
1 answer
170 views

At 80 °C a solution having pH = 7 is? [closed]

When I came across this question I couldn't understand whether, they are asking the nature of solution at 25 °C which has pH = 7 at 80 °C or nature of solution at 80 °C which has pH = 7 at 25 °C ? ...
Rohit P L's user avatar
0 votes
0 answers
77 views

Preparation of copper carbonate from copper acetate and sodium carbonate

I reacted copper acetate with sodium carbonate. It formed a mixture of sodium hydroxide, copper carbonate, copper acetate, and copper oxide. I wanted to know if there is a process to remove the sodium ...
Just a Hobby chemist's user avatar
2 votes
1 answer
431 views

What green and orange solids did I get when I mixed copper acetate and sodium carbonate?

I tried to make copper carbonate by mixing copper acetate with a sodium carbonate solution. I was expecting to see a light blue solid form at the bottom of the beaker and instead I found a green ...
Just a Hobby chemist's user avatar
-2 votes
3 answers
576 views

Can pure hydronium exist?

Can pure hydronium exist? If not, why not? It seems to me (and I am no chemistry expert) like pure hydronium should have the theoretical maximum acidity or minimum pH that a substance can reach. Can't,...
Alexei Rothschild's user avatar
0 votes
1 answer
217 views

When does "always add acid" not apply? [duplicate]

I've been taught a LONG time ago to AAA "Always Add Acid". I've recently come across what feels like an exception to that rule when making piranha solution (you add the H2O2 to the acid). I'...
user1816847's user avatar
-2 votes
1 answer
94 views

Which hydrogens are the most acidic in a THF molecule?

Which hydrogens are the most acidic in a THF molecule? I understand the main factors that influence acidity, but I can't seem to figure this one out and I have not gotten any answers on the internet. ...
Shiv Mehrotra's user avatar
1 vote
0 answers
64 views

What chemical species is really acting as oxidizer in hot concentrated sulfuric acid [duplicate]

In some japanese website it is written that hot conc sulfuric acid has greater oxidation power than that of normal temperature since it contains sulfur trioxide formed by decomposition of the sulfuric ...
satoru kurita's user avatar
2 votes
1 answer
256 views

pKa and pKb in solvents other than water

I know that when you have aqueous solutions, then the pKa and the pKb are linked to each other (pKa + pKb = 14). Is there an equivalent relationship between pKa and pKb in non aqueous environments? I'...
Jack's user avatar
  • 51
0 votes
0 answers
24 views

Why do grignard reagents add to carbonyls at the carbonyl carbon, and not deprotonate at the alpha carbon to form an enol? [duplicate]

I thought that since grignards are such strong bases that they would be immediately protonated by the alpha hydrogen since it is an acidic hydrogen. However, I keep seeing answers that are saying that ...
Carly's user avatar
  • 1
-5 votes
1 answer
48 views

Any compound which can react with some unknown calcium compound [closed]

I have a body made of steel which needs to be cooled, and it is used tap water to do it and over the time that water has deposited some kind of calcium compound inside the cavity where it's running ...
Gabriel Marino's user avatar
-4 votes
2 answers
149 views

What is something that is a strong acid and a strong reducing agent, but not a reducing agent because of the conjugate base of that acid? [closed]

So 2 answers I am not looking for is HI and formic acid. Although both of them are acids, HI and formic acid are not doing the reducing, but their conjugate forms, I- and HCOO- are doing the reducing, ...
Neal Conroy's user avatar
0 votes
1 answer
237 views

is phenolate a strong or weak base? and why?

is phenolate a strong or weak base? I have read somewhere that it would be a weak base. However, since phenolate is the conjugate base of phenol, which is a weak acid, I would think that phenolate is ...
Sal1812's user avatar
  • 19
1 vote
0 answers
141 views

How does a dry shampoo work?

From my chemistry knowledge, I know that soaps are made from fatty acids and some sort of base and this reaction also gives us $\ce{H_2O}$ so the grease in hair dissolves and gets washed away in water....
Rose's user avatar
  • 21
2 votes
3 answers
240 views

How to calculate the pH of a solution with addition of a complex

The scenario is this. I have $50$ mL of $0.1$ M $\ce{NH4^+}$ at a certain temperature which gives it a $K_a=5.2\times 10^{-8}$. To this solution, I add $0.02$ moles of $\ce{Cd(NO_3)_2}$. It is known ...
Pen and Paper's user avatar
-1 votes
1 answer
396 views

Using acetic acid to make vinegar [closed]

I'm aware that a very similar question has been answered, however that only deals with powdered form and there is no information about food safety in there. From what I understand, white vinegar is ...
Tanaka Saito's user avatar
1 vote
0 answers
80 views

Strong acid definition

Strong acids are defined as being stronger than $\ce{H3O+}$ and thus dissociate completely in water. However, what does it mean exactly to be stronger than $\ce{H3O+}$? Is it the Ka value? Also, what ...
Cold_Spaghetti's user avatar
-2 votes
1 answer
89 views

Temperature change when mixing different ratios of NaOH and H2SO4 solutions [closed]

Under the same conditions, mixing how many ml of 1M $\ce{KOH}$ solution and 0.5M $\ce{H2SO4}$ solutions to form a total volume of 100ml produces a rise in temperature?
user avatar
0 votes
2 answers
361 views

Understanding the Composition of Sodium Zincate (Na2ZnO2) Formed from Zinc and Sodium Hydroxide Reaction

I've recently conducted an experiment where I reacted zinc with sodium hydroxide to form sodium zincate (Na2ZnO2). However, I'm having trouble comprehending why sodium zincate has the composition ...
uggupuggu's user avatar
  • 132
3 votes
1 answer
551 views

Is size or electronegativity more important in acidity?

For the molecule below, is the hydrogen with the oxygen more acidic or is it the one with sulfur? Since both parts have the same number of resonance structures, I'm guessing it just boils down to ...
Max0815's user avatar
  • 323
5 votes
3 answers
659 views

Can acid-base reaction occur if two compounds (one acidic and one basic) are added to each other while being in their molten states/pure form?

I am a 14 year old school student and have been told that acid-base reactions occur in aqueous solutions only for they produce ions in aqueous solutions only and I can’t help but wonder if they can ...
Ridam Sharma's user avatar
-5 votes
1 answer
101 views

Why is sodium zincate two sodium ions and two oxygen ions but only one zinc ion? [closed]

$2$NaOH + Zn ---> Na2ZnO2+H2 I have always been fascinated by this reaction because it never made sense to me why sodium zincate has such a strange composition. Why does it have two sodium and ...
uggupuggu's user avatar
  • 132
-2 votes
1 answer
253 views

Does lime juice "alkanize" in the body? [duplicate]

My brothers and I have a dispute. They claim lime juice alkanizes in the body. I contest as an acid it remains acidic in the body. My guess is they are confusing "lime water" with "...
David's user avatar
  • 7
0 votes
0 answers
176 views

Why is m-fluorophenol less acidic than m-chlorophenol?

Why is m-Fluorophenol less acidic than all the other m-Halophenols, even though it has the most inductive effect The data is from : A guidebook to Mechanism in organic chemistry for the JEE, 6th ...
Sai Kritik .T.V's user avatar
3 votes
1 answer
121 views

The contact process

In the contact process, concentrated sulphuric acid instead of water is used to absorb the sulphur trioxide gas produced.One of the reasons suggested online is that the reaction between sulphur ...
Freeby Freeby's user avatar
-3 votes
1 answer
561 views

Reaction of ammonium sulfate with an acid?

Consider the following Which statements are properties of an acid? Statement 1: React with ammonium sulfate to form ammonia. Statement 2: Red litmus turns blue. Obviously stataement 2 is false. ...
Bobs's user avatar
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