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 is on the other hand a chemical species/ molecular entity having an available ...

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1answer
32 views

How is ethanenitrile protonated?

I know that the proton will attack the HOMO, but I'm having difficulty imagining how this will happen. Thank you.
2
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1answer
25 views

Why can't the conjugate base of benzoic acid be stabilized by conjugation with the aromatic ring?

All the carbon and oxygen atoms are sp2 hybridised and can have a p orbital in the correct plane yet only conjugation of the COO- group occurs. I can't think why. I can't draw resonance structures for ...
3
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2answers
26 views

The pH of a neutralized solution

If pH is defined as the concentration of Hydrogen ions in solution, then how can a 'neutralized' solution (defined as having an equal amount of Hydrogen and Hydroxide ions) have a pH other than 7? ...
1
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3answers
35 views

Strong and weak acid

I know sulphuric acid is a strong acid and acetic acid is a weak acid. However when I write them in their chemical symbol. Sulphuric acid: $\ce{H2SO4}$ Acetic acid: $\ce{CH3COOH}$ And I realise ...
0
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1answer
16 views

Alkaline and Bases

I learned about acids and bases in the latest chapter. And I saw that my textbook sometimes write alkaline and sometimes it write base. For me, alkaline and bases are metal oxides and metal hydroxide. ...
1
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1answer
25 views

Is a metal hydroxide fully or partly oxidised in insufficient base?

Firstly, my question only applies to transition metal compounds with more than one hydroxide group, otherwise it would be more obvious. The reason I'm asking is in an effort to oxidise some nickel ...
3
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1answer
37 views

Why did HF disolve this lightbulb at the surface rather than more submerged points?

I watched this video where a lightbulb is suspended in a solution of HF. The result is that the HF dissolves the glass, but it seems like the part of glass on the surface reacted faster than fully ...
4
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1answer
63 views

Why is ammonia so much more basic than water?

The only reason I can think of is that the lone pairs in the oxygen in water are in lower energy orbital relative to the nitrogen in ammonia due to increased effective nuclear charge in oxygen. ...
2
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1answer
48 views

Soap versus Shampoo

Soap and shampoo are both cleaning agents in our daily life. Why is soap in solid form and shampoo is in a liquid form, though? Is it because of the chemical components inside them or another ...
2
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2answers
41 views

Reaction an ROH-resonance-stabilized Group with Hydroxide/Acid-Base Reactions

The book says there is no reaction. However, I do not understand why. The ROH group is resonance-stabilized with the benzene-like group. Its conjugate base is stable. There is an inductive effect ...
2
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1answer
57 views

Finding pH of a buffer solution

A $\ce{pH}$ 4.88 buffer was prepared by dissolving 0.10 mol of benzoic acid (Ka = 6.3 . 10-5) and 0.50 mol of sodium benzoate in sufficient pure water to form 1.00 L solution. To a 70.0ml aliquot of ...
1
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1answer
55 views

Buffer Solution - Sodium Benzoate

A buffer with a pH of $\mathrm{4.79}$ contains $\mathrm{ 0.39\ M}$ of sodium benzoate and $\mathrm{0.10\ M}$ of benzoic acid. What is the concentration of $\mathrm{[\ce{H} ]}$ in the solution after ...
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2answers
28 views

Balancing Ionic and Net Ionic equations

I am currently taking a chemistry course about acids and bases. One of the things I am a bit confused about, is the acid and base neutralization reaction, and how to balance it. For Example: ...
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1answer
33 views

Why are metal oxides basic and non-metals' acidic or neutral

Recently I came across the fact: Metal oxides basic and non-metals' acidic or neutral. Searching for it, partly my query is solved, as I found: Metal oxides or $\ce{O2-}$ forms $\ce{OH-}$ after ...
4
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1answer
35 views

How do I calculate the concentration of H₂SO₄ by a titration experiment with NaOH?

In my latest chem lab the objective was to create a primary standard of $\ce{NaOH}$ and use it to determine the concentration of sulfuric acid. The first part of the lab was determine the molarity of ...
0
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1answer
32 views

What happens when oxidizing Ni(OH)2 with a strong base?

In an aqueous solution, Nickel oxyhydroxide is oxidised with a 1:1 ratio of aqueous Sodium hydroxide. My goal is to produce Nickel oxyhydroxide ($\ce{NiOOH}$). Strong Base: $\ce{NaOH + H2O ...
2
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1answer
106 views

Can protons be swapped in a chemical reaction?

Can the protons of two elements be swapped in a chemical reaction?
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3answers
61 views

Filling a buret tip before an experiment

I have a question that asks if the buret tip is not filled before the experiment what would happen (effect on molarity for acid/base titration). The way I'm thinking about it, it's not like you're ...
0
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2answers
47 views

contact process<application of Sulphuric acid in industry>

Choose the two correct options from A-F, why it is not commercially suitable to dissolve $\ce{SO3}$ directly in water to give concentrated sulphuric acid instead of contact process? The major reaction ...
0
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1answer
30 views

What does 0.12N mean on a bottle of sulfuric acid?

I just bought a bottle of sulfuric acid in order to simulate acid rain for an experiment. I was wondering what 0.12N on the bottle means. I need a simplified version of the explanation as I'm ...
1
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0answers
29 views

Hexafluorosilicid acid attacks glass?

When HF meets glass, Hexafluorosilic acid is formed (assuming some water is present). It appears that Hexafluorosilic acid and further attack glass? How is this so, considering that all F atoms are ...
0
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1answer
64 views

Why HF plus H2O is not a buffer solution?

I think $\ce{HF}$ can be hydrolysis and get $\ce{F-}$ as a conjugate base, so this solution should be a buffer solution. But the correct answer is that this solution is not a buffer. Please explain it ...
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2answers
27 views

How do I solve for titration of this?

I am given $\ce{H2SO4}$ in a reaction vessel of about 50mL. I need to solve for the molarity of $\ce{H2SO4}$. A 10mL sample of $\ce{H2SO4}$ is removed and then titrated with 33.26mL of standard 0.2643 ...
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0answers
51 views

What is the pOH of a 0.0100 F solution of dipotassium phtalate?

What is the pOH of a 0.0100 F solution of dipotassium phtalate? pKa1 = 2.950 and pKa2 = 5.408 for phtalic acid. I did it for phthalic acid by calculating pH and then just doing pOH = 14.00 - pH, ...
0
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1answer
31 views

Finding the Ka of a weak acid after addition of a strong base

When 50.00 mL of an unknown 0.2461 M weak acid are titrated with 0.1968 M NaOH, it was found after the addition of exactly 16.00 mL of base that the pH of the solution was 3.79. From this information, ...
6
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1answer
74 views

Acidity of substituted phenols

Phenol has a $pK_{a}$ approximately equal to $9.9$. When one studies the acidity of chlorophenols, one notices the following: First of all, chlorophenols are more acidic than phenol, due the ...
2
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1answer
47 views

Does the amount of acid change when I add water to vinegar?

I have a question that asks me to describe why adding distilled water to my vinegar sample would not affect my calculated Molarity (determining amount of acid in the vinegar be titration with a base). ...
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0answers
24 views

Buffer Power of the amphiprotic substance

The mass balance for a generic amphiprotic substance $[AH^-]$ this: $$ [HA^-]=C \cdot \dfrac{K_{a1} [H_3O^+]}{K_{a1}\cdot [H_3O^+] + [H_3O^+]^2 + K_{a1} \cdot K_{a2}} \quad Eq.1 $$ where: C = ...
0
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0answers
30 views

Imine stability in acids and bases

I understand that imines can be hydrolyzed in acidic medium. But what about in basic medium? Can imines still be hydrolyzed? I have a plausible mechanism ... nitrogen's withdrawal of electron ...
2
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1answer
53 views

In which direction does imidazole affect the pH?

I'm reading something about nickel affinity chromatography and it talks about using imidazole to affect pH. In which direction does it change the pH?
0
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0answers
34 views

Positive and negative charges and acidic or basic media

I am told that we shouldn't have any negative charges when showing a mechanism of something that occurs in basic media. The opposite goes for a mechanism occurring in acidic media. Are there any ...
1
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1answer
29 views

Is atom-clean aluminum active enough to react with alkali salts?

Thermally evaportated $\ce{Al}$ under high vacuum is free of oxidized species and highly active. But is it active enough to even substitute the alkali cationic metal in alkali salts, like $\ce{LiOH, ...
0
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1answer
56 views

Buffer solution calculation

Consider a buffer solution made from mixing 1 ml of $\ce{Na2HPO4}$ (0.1 M) and 9 ml of $\ce{NaH2PO4}$ (0.1 M) having $pKa$ of 7.21. When 1 ml of $\ce{HCl}$ (0.1 M) is added the measured $pH$ ...
0
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2answers
42 views

find the pH where is maximum the concentration of a amphiprotic substance

Considering a general amphiprotic substance NaHA. I know that the maximum concentration of the specie $HA^-$ is found at $pH = \dfrac{pKa1+pKa2}{2}$. Why? How i can confirm this statment? The ...
0
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2answers
73 views

Write a Net Ionic Equation to Represent the Reaction of Aqueous Ammonia with Propionic acid

I would like to know how do I begin to solve a problem like this? That is finding the formula equation? I would assume that it would be $$ \ce{NH3 + CH3CH2COOH -> NH3 + CH3CH2COOH + H2O} $$ I ...
0
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2answers
28 views

When mixing lye and citric acid, which citrate will form?

I'm trying to combine precise amounts of citric acid and lye to get sodium citrate with minimal amount of reacted acid/base. I'm not so sure how stochiometry works, but I could sure learn that from ...
8
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2answers
1k views

If caffeine is an alkaloid, why is coffee acidic?

I have just put together on my mind these two facts: caffeine is an alkaloid and brewed coffee is slightly acidic (pH = 5). My Biology teacher and my Chemistry teacher could not elaborate satisfying ...
2
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2answers
61 views

Why do acids ionize in solution if they are covalently bonded?

Maybe I am wrong, but I thought acids were covalently bonded since hydrogen doesn't form ionic compounds. For example, wouldn't $\ce{HCl}$ look like: Since the electrons are shared, why does it ...
6
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3answers
355 views

Why are weak acids weak?

What are weak acids? My chemistry and biology class's skimmed over them briefly but nothing in depth. I understand that an acid is weak if it partially dissociates and breaks down into ionic ...
0
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3answers
82 views

How do you explain pKa to non professional?

Let's say we have substance A which was mixed with substance B to improve shelf-life because pKa of the substance A is 7.9 and in mix the pH is 5.2. Does this mean that in the solution with pH near 8 ...
3
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1answer
51 views

Find the initial volume of the weak acid given a titration graph

Question Below is a picture of a titration between a weak acid, $\ce{HA}$, and a 0.150 M $\ce{NaOH}$ solution. Find the initial volume of the weak acid in millilitres in this titration. My work ...
3
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2answers
74 views

What makes protons give the property of acidity?

Bronsted Lowry definition of an acid says that an acid gives away protons. What I don't understand is what makes dissolved protons grant the property of acidity? Like, why would dissolved protons eat ...
11
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3answers
3k views

Which is the strongest acid?

According to Wikipedia $\ce{HeH+}$ and Fluoroantimonic Acid are the strongest. According to Nature, Carborane acid is the strongest, but Wikipedia says fluoroantimonic acid is stronger... Links: ...
7
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1answer
199 views

Which is more basic, hydrazine or ammonia?

Which of the following will be more basic, hydrazine $\ce{H2N-NH2}$ or ammonia $\ce{NH3}$? My chemistry teacher said that $\ce{NH3}$ is more basic since after giving $\ce{H+}$ to hydrazine results in ...
0
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1answer
24 views

Ionic Equilibrium

Calculate the pH of a solution which contains 100mL of 0.1M $\ce{HCl}$ and 9.9mL of 1.0M $\ce{NaOH}$. While calculating the concentration of $\ce{H+}$ ions, why shouldn't we consider the H+ ion ...
2
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1answer
69 views

Alkyne formation from vicinal dihalide

Why must 3 equivalents of sodium amide be used here to form the alkyne? The part I specifically have issue with is in red. From what I understand, we should just use 2 equivalents of sodium amide to ...
4
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1answer
94 views

Which proton is more acidic in this compound?

I'm having trouble determining which of these protons is more acidic. I was thinking the solution had something to do with the double bond in the aromatic ring, but I'm still not sure. If anyone can ...
1
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0answers
28 views

Degree of dissociation of strong electrolytes in concentrated solutions of ionic substances

Why is the dissociation of strong electrolytes complete in very dilute solutions of ionic substances but less likely to be so in more concentrated solutions? Before seeing this, I thought a strong ...
3
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2answers
71 views

Interesting ionization of sulfuric acid

I just need an explanation of why it is a strong acid in its first ionization and a weak acid its second ionization. It becomes $\ce{HSO_4-}$. From what I have learned about oxoacids, the bond ...
5
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2answers
136 views

What is the word for how polyprotic an acid is?

What is the word to describe the number of acidic hydrogens an acid has? I am currently thinking something like "proticity", but I am not sure The use case world be for a table of things like this: ...