All Questions
Tagged with acid-base inorganic-chemistry
438
questions
0
votes
1
answer
143
views
Why is phosphoric acid a weak acid?
What is the reason for the phosphoric acid $\ce{H3PO4}$ being a weak acid despite having a structure similar to that of sulfuric acid $\ce{H2SO4}?$
I found some sources claiming that the resonance of ...
- 19
2
votes
0
answers
58
views
Phase diagram of ammonium hydrosulfide, a volatile salt
Salts (ionic compounds) usually have low volatility due to the strong ionic bond.
However, there are exceptions. Smelling salts decompose and release ammonia gas.
What is "volatile"?
If a ...
- 972
0
votes
1
answer
160
views
Amphoteric character of V2O5
In my NCERT textbook, in the chapter 'The d- and f-block elements', the last paragraph under oxides and oxoanions of metals goes like this:
$(...)$ $\ce{V2O5}$ is, however, amphoteric though mainly ...
- 828
-2
votes
2
answers
83
views
Reaction between copper rod and carbon rod in hydrochloric acid [closed]
The situation is this: a copper rod and a carbon rod, touching each other, are submerged in HCl(aq). We're asked to describe the reaction that occurs, but as far as I can see, there's no reaction? The ...
- 5
-2
votes
1
answer
125
views
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 ...
- 55
4
votes
2
answers
196
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 ...
- 610
1
vote
2
answers
244
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 ...
- 610
2
votes
2
answers
67
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 ...
- 79
1
vote
0
answers
42
views
Why is it that in a buffer solution the equilibrium concentrations may be assumed to be the initial concentrations? [duplicate]
Considering the Henderson–Hasselbalch equation,
$$\text{pH} = \text{p}K_a + \lg \frac{[\ce{AcO⁻}]} {[\ce{AcOH}]}$$
$$\text{p}K_a = \lg \frac{[\ce{AcO⁻}][\ce{H⁺}]} {[\ce{AcOH}]}$$
Why are the values ...
- 11
7
votes
2
answers
350
views
Do peroxy acids such as peroxynitric acid have anhydrides?
Anhydrides reversibly react with water to form a respective acid or base. For example, $\ce{CO2}$ is the anhydride of $\ce{H2CO3}$:
$$\ce{CO2 + H2O <=> H2CO3}.\tag{R1}$$
Acidic anhydride can be ...
- 79
-2
votes
2
answers
372
views
How to neutralize 60L of a 2% Aqua Regia with Various Metals suspended
I am encountering an issue in my laboratory. My supervisor and I are currently faced with the task of neutralizing a volume of 60 liters of Aqua Regia, which contains suspended metals, at a ...
- 31
13
votes
3
answers
2k
views
Why Is Hydrogen in HSO3- Connected to Oxygen Instead of Sulfur?
One of the questions in my homework was to draw $\ce{HSO3-}$, which I thought to be pretty easy. Sulfur is the least electronegative (except hydrogen but it can't be the central atom), hence it is the ...
- 155
1
vote
1
answer
107
views
What are the dissociation constants of hydronium and hydroxide ions? [duplicate]
Context
The answer to How to calculate Ka for hydronium and Kb for hydroxide?, water was regarded as solvent once and base (or equivalently acid) once while citing Reference 1 (1986) and made no ...
- 2,304
7
votes
1
answer
341
views
Why is fluoroantimonic acid so unique?
Fluoroantimonic acid is the strongest acid because its conjugate base $\ce{SbF6-}$ is exceptionally stable. $\ce{SbF6-}$ is in perfect octahedral symmetry wherein the negative charge is equally shared ...
- 571
6
votes
1
answer
496
views
Why does phosphinic acid not form pyroacids?
Why does $\ce{H3PO2}$ not form pyroacids? All I know is pyroacids are derived oxyacids obtained by removing one $\ce{H2O}$ molecule from two molecules of oxyacids. Correct me if this is wrong.
0
votes
1
answer
104
views
Ductless fume hood for dissolving aluminum foil in hydrochloric acid
I work at a food manufacturing plant and we use Tetra Pak packaging for our liquid foods. There is a layer of aluminum foil within the packaging material that we need to dissolve out of the package in ...
- 11
-3
votes
2
answers
113
views
Powder left everywhere after solution was left to evaporate. What could it be?
I dissolved a coin made of silver and copper and probably other metals in nitric acid. I neutralized the solution with some sodium hydroxide and then added salt(NaCl) to make Silver Chloride. A white ...
1
vote
0
answers
146
views
Are there TLC stains for organo fluor compounds or anorg. fluoride that are useful for selecting the product containing fractions post purification
Are there TLC stains that work with fluoride or with organofluor compounds? I have a fluorinated phosphonic acid that does not stain with conventional means. I did research in many of the known and ...
- 799
-4
votes
1
answer
357
views
If NaOH is a Brönsted-Lowry base then, what is its conjugate acid? [closed]
Brönsted-Lowry theory doesn't go against but adds to the Arrhenius theory on bases and acids.
$\ce{NaOH}$ is an Arrhenius base because it releases hydroxide ions in water solution.
NaOH is also a ...
1
vote
1
answer
216
views
Henderson-Hasselbalch equation and degree of dissociation
Is it possible to evaluate the degree of dissociation in unbuffered solutions, through the Henderson-Hasselbalch equation?
For example: place acetic acid in a sodium hydroxide solution. After the ...
- 127
4
votes
1
answer
244
views
What results from the neutralization of copper citrate with Na2CO3
I found this question that describes PCB etching with citric acid. The answer to that question explains how hydrogen peroxide, salt, and citric acid can be used to ionize copper metal in water, which ...
- 165
9
votes
2
answers
1k
views
Why are sulfites often ignored in soil studies?
From a document on soil chemistry that I am reading:
The acid-base potential of a soil takes soil pH, total sulfur (sulfides and sulfates), and neutralization potential into account to determine the ...
- 435
0
votes
1
answer
307
views
What is ionic reaction equation for reaction between carbon dioxide and limewater?
Write the ionic reaction equation for the reaction
\[\ce{Ca(OH)2(aq) + CO2(g) <=> CaCO3(s) + H2O(l)}.\]
I first wrote the complete ionic equation as such:
\[\ce{Ca^2+ + 2 OH^- + CO2 <=> ...
- 133
3
votes
1
answer
804
views
When NaOH ionizes in water, does the OH– react with the water molecules or with the hydronium ions from the dissociation of water?
NaOH in water becomes $\ce{Na+}$ and $\ce{OH-}$ ions. If it's a Bronsted Lowry base then the $\ce{OH-}$ ions will take $\ce{H+}$. But FROM where exactly - from the water molecules or from the ...
3
votes
1
answer
104
views
Why is phosphine more acidic than ethylene?
Shouldn't ethylene should be more acidic? It has a C=C bond, so the density of electron cloud would be higher in the areas of the double bond while the C-H single bond have way less electron density. ...
- 110
4
votes
1
answer
391
views
Predict who is the acid and who is the base in an acid-base reaction using pKa
In my book (Bruice) it is specified how it is possible to compare the pKa of two substances to understand who acts as an acid and who as a base. Here's the example in the book:
$\ce{NH3 + H2O}$.
$\...
- 127
-2
votes
1
answer
260
views
Should nitric acid be classified as a strong acid? Does it completely dissociate in water?
By definition, a strong acid must completely ionize in aqueous solution. However, in order to completely dissociate in water, strong acids must be more acidic than a hydronium ion and hence have a pKa ...
- 69
-5
votes
1
answer
183
views
Is an aqueous solution of lithium superoxide basic or neutral? [closed]
Is the aqueous solution of lithium superoxide basic or neutral?
I know that $\ce{Li}$ is a metal, thus its oxide ($\ce{Li2O}$) produces base in reaction with water.
- 1
5
votes
1
answer
491
views
Why is water present in "pure" nitric acid and RFNA and WFNA?
Various types of nitric acid have been used in rocket fuels as oxidisers (RFNA is red fuming nitric acid, WFNA is white fuming nitric acid) as they are often hypergolic with a wide variety of fuels.
...
- 37k
-3
votes
1
answer
108
views
Does concentrated HNO3 oxidize aluminium to form a protective oxide layer, or is the oxide layer already present so HNO3 is unable to react? [duplicate]
Sources on the internet like this one only say that aluminium does not react with concentrated or dilute $\ce{HNO3}$.
I have seen other related questions on this site but none answers my question ...
- 179
0
votes
1
answer
652
views
Is calcium carbonate a Brønsted–Lowry base, a Lewis base, or both? [closed]
What type of base would $\ce{CaCO3}$ be in the following example:
$$\ce{CaCO3 + H2SO4 -> CaSO4 + CO2 + H2O}?$$
My understanding is that calcium carbonate cannot be a Brønsted–Lowry base because ...
- 69
0
votes
0
answers
682
views
Reaction of lead with acetic acid and hydrogen peroxide solution
My textbook says lead reacts with acetic acid when there is enough oxygen to oxidize lead:
$$\ce{2 Pb + O2 + 4 CH3COOH -> 2 Pb(CH3COO)2 + 2 H2O}$$
So, I added lead into mixed solution of acetic ...
- 677
0
votes
0
answers
418
views
Reaction of hydrogen peroxide with acetic acid and potassium permanganate
I conducted an experiment where I mixed hydrogen peroxide $\ce{H2O2}$, acetic acid $\ce{CH3COOH}$ and potassium permanganate $\ce{KMnO4}$ under vigorous stirring. The reaction hasn't stopped after 15 ...
user127378
2
votes
1
answer
226
views
Why and how do aqueous silica systems precipitate and can its occurrence be mitigated by quantifying its speciation correctly?
Background/Context:
For context, I have been doing a lot of work on experimental systems in geopolymer chemistry lately with a focus on "activator" solutions which are essentially mixtures ...
- 500
1
vote
1
answer
344
views
Dissolving Pyrite with HCl: Will dissolving KNO3 in HCl give it a similar oxidizing effect to HNO3?
I'm trying to dissolve small pyrite (FeS2) grains. It's supposed to be done in nitric acid, but my lab doesn't have any. It does have a lot of 37% HCl and various salt oxidizers, such as KNO3, KMnO4, ...
- 41
0
votes
0
answers
165
views
Why is the pH of this ammonia solution more acidic than another ammonia solution?
I made two similar ammonia solutions in different ways, and they resulted in different pH, but i'm not sure why.
Solution 1
Added 5.84 g NaCl to a 500 mL flask. Then added 10 mL 25% ammonia solution. ...
- 11
3
votes
0
answers
85
views
Is hydrochloric acid or sulfuric acid more corrosive to titanium?
Which acid is more corrosive to titanium at 20 to 30 °C and similar concentrations: hydrochloric acid $\ce{HCl}$ or sulfuric acid $\ce{H2SO4}$?
I found some info on AZoMaterials — Titanium - Corrosion ...
- 131
2
votes
2
answers
356
views
Conductometric titration curve plotting
In the conductometric titation of HCl vs NaOH, the conductance initially decreases, reaches a minimum at equivalence point, and then the slope of the curve becomes positive:
Source: https://chart-...
- 408
0
votes
1
answer
139
views
Should I write formula for oxalate or oxalic acid while balancing a redox reaction using the ion-electron method?
Problem:
Balance the following reaction using the ion-electron method:
$$\ce{H2C2O4 + KMnO4 + H2SO4 -> CO2 + MnSO4 + K2SO4 + H2O}$$
My book's solution:
Oxidation half-reaction:
$$\ce{C2O4^2- -> ...
- 201
-2
votes
2
answers
181
views
Can chloride donate an electron pair to silver(I)?
According to the Lewis dot structure of $\ce{Cl-}$, $\ce{Cl-}$ has octet fulfilled and should be able to donate a pair of electrons as it is a Lewis base. The Lewis dot structure of $\ce{Ag+}$ seems ...
user123510
6
votes
1
answer
67
views
How to make a thin layer of crystalline barium titanate on copper substrate?
Is it possible to create a thin $\ce{BaTiO3}$ crystal layer on a copper plate by putting the plate in a beaker, pouring in heated hydrofluoric acid that has been saturated with $\ce{BaTiO3}$ powder ...
1
vote
0
answers
36
views
My particles won’t separate without neutralizing the solution. I want to understand why?
I etched active carbon with a concentrated KOH solution and added HCl to neutralize the KOH. Separeted the particles with centrifuge at 4000 rpm. They should be micron sized.
My boss asked me to stop ...
- 421
1
vote
3
answers
239
views
Discrepancies in using pOH vs pH to solve H+/OH- concentration change problem
I found an extremely confusing problem in one of the problems we did in class for general chemistry. This was the question:
How many moles of $\ce{H3O+}$ or $\ce{OH-}$ must you add per liter of $\ce{...
- 21
3
votes
2
answers
310
views
Reaction between sodium hydroxide and phosphorus trioxide
My chemistry textbook [1], chapter Periodic Properties of Elements, section p-Block elements — formation of oxides suggests that the reaction is
$$\ce{P2O3 + 2 NaOH -> 2 NaHPO3},\tag{R1}$$
but ...
-1
votes
1
answer
106
views
What is the product of the following reaction(different sources give different answers) [closed]
$$\ce{FeS +dil HNO3}$$
$$\ce{FeS +conc HNO3}$$
I got different answers to these reactions in different sources
Source1 Jd lee:
Source 2 Op Tandon:
Can anyone please explain which is the correct one ...
- 1
3
votes
1
answer
2k
views
Reaction between concentrated sulfuric acid and sodium bromide
What are the products of the reaction between sodium bromide and concentrated sulfuric acid?
I did the question like this:
$$
\begin{align}
\ce{2Br- &-> Br2 + 2e-} \tag{R1.1} \\
\ce{SO4^2- 4H+ ...
- 27
1
vote
1
answer
442
views
Why is sodium bisulfate acidic? [closed]
So, as I know, the rule says that if you get a salt from strong acid and strong base it should be neutral. In this situation with sodium bisulfate and also trisodium phosphate we get an acid salt, ...
- 23
-2
votes
2
answers
234
views
How can boric acid forms pyroboric acid if it is a monobasic acid?
Pyro acids are prepared by removing one water molecule from two molecules of oxyacid. $\ce{H3BO3}$ has only one acidic hydrogen so two of that molecule will have two acidic hydrogens. If we remove ...
7
votes
3
answers
3k
views
Why do diluted sulfuric acid and hydrogen peroxide etch copper only when chloride ions are present?
I've mixed 30 ml 10% sulfuric acid with 20 ml 3% hydrogen peroxide and put a drop of this solution onto copper foil. The solution quickly removed the oxide layer from the copper but did not dissolve ...
- 191
0
votes
0
answers
160
views
Pcb etching safety questions (HCl, H2O2, H3PO4)
I am about to embark on a pcb etching journey, however, I am not sure what safety precautions I should take when handling the products. I know that the reagents should be stored in their original, ...
- 17