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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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
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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 ...
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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....
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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: ____""
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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?
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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. ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 $...
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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 ...
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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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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 ...
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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?
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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 ?
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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 ...
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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 ...
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3
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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,...
