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 ...
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8 views
How does Borax Solution act as a buffer?
What type of buffer is it? If it's a Weak Acid-Conjugate Base type of buffer, what is the weak acid and conjugate base?
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0answers
22 views
Why BrCH2COOH is more acidic than ClCH2COOH?
I am unable to understand why BrCH2COOH is more acidic , since Chlorine is more electronegative than Br and also the position is same. Can anyone explain me the reason ?
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How can someone protect itself if ak 20k oxidant is released into the atmosphere accidentally? [on hold]
The compound of Ak 20k or Melange is:
Nitric acid (HNO3) no less than 73.00 %
Oxide of nitrogen (N2O4) 17.50 -22.50 %
Anhydrous hydrogen fluoride (HF) 0.50 -0.75 %
Phosphoric acid (H3PO4) 1.00 -1.30 %
...
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1answer
22 views
What is the driving force of this reaction?
I know that every reaction that occurs in a solution must have a driving force leading to the kicking out of some ions from the solution. These reactions include redox , double-displacements and acid/...
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0answers
7 views
Reversing a reaction [duplicate]
It is well know that if one put HCl and NaOH togeter one get at the end water and common salt. What I have to do in order to reverse the reaction? I suppose that one have to add energy to the reaction ...
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0answers
29 views
Arrange these compounds in the increasing order of Acidic strength [on hold]
These are some compounds for which the order of acidic strength is need to be determined.
I started by following the series of acidic strength as
Sulphonic Acid> Carboxylic> Carbonic> Phenols> ...
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0answers
35 views
How is Be(OH)4 Formed?
I recently did a test paper and the question stated that Be(OH)2 is amphoteric and so I was asked to write equations showing it both acting as an acid and a base.
Acid answer: $\quad\ce{Be(OH)2 + 2H+...
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0answers
43 views
Why does sulfuric acid form sulfate compounds in acid-base reactions?
I read that since sulfuric acid is diprotic, if it is dissolved in water the reaction with a greater acid dissociation constant is the one which produces hyronium ions and hydrogensulfate ions. Where ...
3
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1answer
39 views
Is there also a leveling effect for weak acids in water?
The leveling effect says that any acid stronger than the hydronium ion ($\ce{H3O+}$) will completely dissociate in water. Hence no differentiation of acid strength is possible between eg HBr and HCl ...
1
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1answer
48 views
Chloroantimonic v/s fluoriantimonic
Does chloroantimonic acid exists like . If not , than why , what we get when we mix hydrochloric acid and antimonypentachloride and can we predict its acidic strength if it would ever be synthesized. ...
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0answers
8 views
acid-base indigo carmine indicator
This is grade 10 so probably an easy answer.
Indigo carmine is blue until about 11.5, the turns yellow by about 13.75 (according to a chart in my text). At pH 12, what color would it be? Still ...
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0answers
60 views
Acid HClF6 and HIF6
I was wondering about $\ce{HClO4}$ which is a very strong acid . I thought it can be made stronger by replacing $\ce O$ with $\ce F$ to make $\ce{HClF6}$ but didn't find its existence . I thought that ...
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1answer
45 views
Why does a colour change in neutralisation occur? [closed]
An indicator shows whether an substance is a base or an acid but during a neutralisation reaction the colour change occurs due to the solution be neutral (i.e pH is 7). But since the indicators only ...
2
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2answers
88 views
Acids of noble gases
Are there any other acids of noble gasses besides xenic acid? Why other ones seem to be very unstable (like perxenic), or completely unknown (acids of any other noble gases). Particularly are there ...
2
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1answer
54 views
Do polyfluorosulfuric acids like H2SO2F4 exist?
I was thinking about a compound resembling $\ce{H2SO4}$ but more acidic. I thought to replace the 2 oxygens with 4 fluorine atoms getting $\ce{H2SO2F4}$, which might be more acidic. Does such a ...
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0answers
22 views
Why would pH of weak acid solution decrease from adding dH2O
I added 20 mL of distilled water to a 35.2mL acidic solution consisting of acetic acid and sodium acetate and the pH decreased can anyone tell me how this could happen?
I expected the pH to increase ...
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2answers
43 views
Why is the concentration of protons equal to the concentration of a strong acid?
First, I know that strong acids are assumed to dissociate completely in water, so that the concentration of $\ce{H+}$ which they provide equals their concentration.
What I am asking for is not the ...
1
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1answer
44 views
What's the reaction between H2SO4 and NaH2PO4?
I'm guessing it's going to be
$$\ce{H2SO4 + 2 NaH2PO4 -> 2 H3PO4 + Na2SO4}$$
Could anyone please let me know what the actual reaction is?
Thank you
2
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1answer
60 views
Is acetic acid or d3-acetic acid more acidic?
Why is $\ce{CD3-COOH}$ more acidic than $\ce{CH3-COOH}$ despite being less electronegative? The book too said that $\ce{CD3} > \ce{CH3}$ in terms of + Inductive effect.
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0answers
35 views
Can I neutralize sulfamic acid with baking soda?
I cleaned some tiles with a 2 tablespoon and 1 cup of water sulfamic acid solution. I was wondering how to best neutralize. I read that sodium nitrate should be used but can I substitute baking soda? ...
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1answer
44 views
Is cyclohexanol or hexanol more acidic?
If we had a hexane ring with an $\ce{OH}$ substituent vs. a hexane chain with an $\ce{OH}$ substituent, which of the two, if any, would result in a weaker conjugate base?
My confusion: The ring ...
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0answers
17 views
Can't seem to get the correct result for my iodometric titration calculations finding the ppm of chlorine in a sample
The rough method I used is as follows:
$\pu{50mL}$ of chlorine water sample and $\pu{100mL}$ acidified Potassium iodide.
Add $\pu{0.001M}$ sodium thiosulfate until solution goes dark yellow then add $...
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3answers
57 views
Titration of Na2CO3 against HCl
$\pu{25mL}$ of $\pu{0.125M}$ $\ce{Na2CO3}$ is titrated with $\pu{0.100M}$ $\ce{HCl}$.
Given that $K_{a1} = 4.3\times10^{-7}$ and $K_{a2} = 4.8\times10^{-11}$ for the diprotic acid $\ce{H2CO3}$, ...
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0answers
37 views
Strength of acids and bases
Good day,
I've recently learnt about $\ce{Mg(OH)2}$ and was curious to know if it was a strong or weak base.
There are people online who say that magnesium hydroxide, when added to water only forms a ...
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3answers
22 views
What makes Citrate or Citric Acid an acid?
As far as I know, an acid is something that gives off a proton or hydrogen ion $H^{+}$.
But when I look at Citric Acid,
There are three $COO^{-}$, which I think is a carboxyl group, that lacks $H^{+...
1
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1answer
56 views
Is sodium ion an acid?
As sodium ion has a 1+ charge and it can form the ionic compound NaOH with OH1-, hence it is a lone pair accepter (is this correct?). Therefore sodium ion should be an acid?
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0answers
35 views
Adding chemical equations
I was studying the properties of acids and bases and I came across a point under the subtopic Conjugate acid-base pair where they wanted to prove the possible basicity of a solution due to the ...
1
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2answers
54 views
When an acid is added to water, why does the hydroxide ion concentration decrease?
At equilibrium in pure water, we have
$$\ce{[H_3O+][OH-]} = 10^{-14}$$
Since $\ce{H3O+}$ and $\ce{OH-}$ ions are produced in pairs, we may conclude
$$\ce{[H_3O+]}=\ce{[OH-]} = 10^{-7}$$
So far so ...
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0answers
41 views
Why does my electrochemical cell generate an unexpected voltage?
I'm making a science experiment in which I want to create a simple battery, but sadly instead of generating $\pu{1.1V}$ as calculated it gives out $\pu{0.5V}$. I'm using a small piece of copper ($\pu{+...
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1answer
28 views
Would then base react with water? [closed]
Imagine you fill a tank with undecayed neutrons and water .Now neutrons will decay into proton and electrons. Assume that the wall of the container is so thick that it doesn't allow the protons to ...
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1answer
24 views
When reacting a strong acid with a weak base, would all of the strong acid react with the weak base
If I do the following reaction:
$$\ce{Na3PO4 + 3HNO3 -> 3NaNO3 + H3PO4}$$
Does nitric acid completely react with the Trisodium phosphate to form a weak acid and a salt, or does it form a small ...
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1answer
39 views
NaOH being added to Formic Acid (Please catch my error!)
I am adding 0.55 mL of 0.1M NaOH to 10 mL of 0.5M Formic Acid.
Here are the values I calculated to use.
Moles H+ : 0.5 * (10mL / 1000) = 0.005 mol
Moles OH- : 0.1 * (.55mL / 1000) = 0.000055 mol
...
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0answers
45 views
Is the concentration of water included in the acid disscociation constant? - Wikipedia confuses me
I refer to the following wikipedia article
https://en.wikipedia.org/wiki/Acid_dissociation_constant
Header paragraph: Equilibrium constant.
First the equilibrium constant is given in terms of ...
2
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1answer
42 views
Substituent effects on acidity
It is said that 4-methylbenzoic acid will be a weaker acid than benzoic acid. 4-nitrobenzoic acid will be a stronger acid than benzoic acid.
I don't understand why the methyl group on 4-...
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1answer
47 views
Is (Zn(OH)4)2- acidic or alkaline?
My chemistry teacher told me that $\ce{Al(OH)4^-}$, $\ce{Pb(OH)4^2-}$, $\ce{Zn(OH)4^2-}$ are called complex ions. So will they break down in some conditions and give out $\ce{OH-}$ to show alkaline ...
2
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0answers
99 views
Do bond lengths change upon protonation of a molecule such as an H2O molecule?
Wouldn't the hydrogen atom in a hydronium cation feel a greater proton repulsion force (nucleus-nucleus repulsions) from the oxygen atom and orient away from the oxygen atom to maximize the attractive ...
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1answer
49 views
Why don't buffer solutions return to equilibrium?
Suppose I want to make a buffer solution in any of the three ways possible with dihydrogen phosphate as my weak acid. In the first way, a certain ratio of the weak acid and its conjugate base are ...
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2answers
74 views
Basification of acid solution. pH calculation. How?
This is my first post.
In order to understand basification I've created a pretty simple example as I currently understand it mainly because.. I really don't understand all of it.
Example:
...
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1answer
34 views
neutralization of a strong acid with a strong base [closed]
When a 1M H2SO4 is mixed with an equal volume of 1M NaOH, is the mixture acidic, basic, or neutral?
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1answer
33 views
How do I calculate the amount of polyprotic acid and base needed to achieve a certain buffer pH?
e.g. Citric Acid and Trisodium Citrate
$\ce{H3C6H5O7 <=>[ka_1] H2C6H5O7- + H+ <=>[ka_2] HC6H5O7^2- + H+ <=>[ka_3] C6H5O7^3- + H+}$
Using the definition of Ka and substituting for ...
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0answers
44 views
Is it necessary to write water as a reactant in the acid dissociation equilibrium?
If I wish to write out the acid dissociation equilibrium, is it necessary to write in the water as a reactant, or does it suffice to write the following?
$$\ce{HA <=> H+ + A-}$$
Is it alright ...
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1answer
102 views
When using a “dilute hydrochloric acid” solution, how diluted should it be?
Quite often when reading through some instructions or documentation or an outline that I've found online (EG: acid-base extractions), theres a step that involves using a "dilute hydrochloric acid ...
3
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2answers
61 views
Comparing acidity between groups
I tried to do this using the stability of conjugate base. I can see (2) will be most stable due to resonance however my confusion lies in (1) and (3).
While in (3), the negative charge is unstable but ...
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1answer
94 views
Does HCl evaporate at room temperature?
So my question is...lets say that somebody pours hcl (30%) in the toilet and on bathroom floor.Does the acid evaporate after a while it is it possible that it's still present after like month?
Thank ...
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2answers
40 views
Calculate pH of a mixture of a strong base and acid. Knowing only the pH, wt/v%, and volume of both solution. [closed]
Title explains all. I have been stuck on this for an hour and for some reason cannot understand it. I have tried to do an ICE table but get stuck halfway as I do not know whether I would use the w/v ...
1
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0answers
57 views
Why is antimony pentafluoride a stronger Lewis acid than phosphorus pentafluoride or arsenic pentafluoride?
How can these relative reactivities as a Lewis acids be rationalized:
$$\ce{SbF5 > AsF5 > PF5}$$
One simple argument could be the size of the $\ce{Sb}$-center: Because it is bigger than for ...
0
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0answers
28 views
pH calculation of salt in acid
A person go to an all-you-can eat restaurant but eat a little too
much and get heartburn. He returns to his room, looking for a remedy. He takes $3$ teaspoons of milk of
magnesia, which contains $...
2
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0answers
98 views
Comparing the basicity of benzamide and acetamide
What if we were asked to compare the basicity of benzamide and acetamide?
Which one of them would be more basic? I read somewhere on the internet that benzamide must be more basic than acetamide due ...
2
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1answer
38 views
pH throughout a titration
Estimate the $\ce{pH}$ of the solution that results when $\ce{75.0 mL}$ of $\ce{0.275 M HCl}$ is added to $\ce{50.0 mL}$ of $\ce{0.275 M Na2HPO4 (aq)}$.
My book gives the successive $\ce{Ka}$ values ...
1
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1answer
65 views
Why doesn't pH = pKa1 in the buffer zone for this titration?
Below is an image from my textbook representing the titration curve for the titration of $5.00\ \mathrm{mL}$ of $0.010\ \mathrm M$ $\ce{H2S2O3}$ with $0.010\ \mathrm M$ $\ce{KOH}$, which has $\mathrm ...
