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
11 views

Why aren't the amine groups in the nucleic acid bases protonated?

Nucleobases G, C and A carry an amine group ($\ce{-NH2}$). In amino acids, the amine groups are considered protonated at physiological pH. Why isn't it the case for the amine groups of nucleobases? I ...
0
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1answer
24 views

Why is BuLi a better nucleophile than base?

In Carey, Sundberg Advanced Organic Chemistry it is written: The relative slowness of the abstraction of protons from carbon acids by organolithium reagents is probably also due to the compact ...
3
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2answers
49 views

Why does the pH of soft drinks get lower as they go flat?

I am doing an investigation about the chemistry of soft drinks and as part of this I observed the effect of time on the pH of soft drinks fully expecting the pH to increase as the carbonic acid, a ...
4
votes
2answers
51 views

Cis/trans stereochemistry dictating pKa

Why is trans-4-phenylcyclohexane-1-carboxylic acid a stronger acid than the cis isomer? In the cis-isomer the carboxyl group is axial; and, given the 1,4 distance from the phenyl, why would ...
3
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1answer
354 views

Which hydrogen of 3-methylcyclohex-2-en-1-one is the least acidic?

According to me it should be 2, as on its removal there wont be any resonance stabilization as would happen in other cases. In addition to that a negative charge residing on a carbon attached to a ...
0
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1answer
28 views

Copper metal with silver ion

New to chemistry. In my book it states that 2AgNO3(aq) +Cu -->Cu(NO3-)2(aq) +2Ag(s). In addition to the formula it depicts an image of the reaction. It depicts an image shown here: https://imgur.com/...
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2answers
27 views

Regarding Kw, titrations, and pH

So I have need of performing a titration upon a fruit juice to determine acid concentration. I will be using 1M NaOH as my base. Seeing as the solution will be coloured, it would be difficult to use ...
3
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2answers
37 views

Confused about weak/strong acids, conjugated acid-base pairs and buffers

I learned that a) the conjugate base to a weak acid is a strong base (and vice versa). b) a buffer consists of a weak acid (base) and its conjugate base (acid). However, this explanation of ...
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0answers
19 views

What is the influence of a solution's pH on its conductivity? [closed]

I am doing a school project about whether acids or bases conducts electricity better, but I don't find a lot of information on the topic. So what is the influence of pH on the conductivity of a ...
2
votes
2answers
59 views

Which is a stronger acid: H3O+ or HCl?

I know as a fact that HCl is a stronger acid than H3O+, but I want to know the reason behind it. The definition of an acid is a substance which dissociates to give H3O+ ions. In that case H3O+ should ...
3
votes
1answer
33 views

Calculate ion concentrations in mixed buffers

I have to state that I'm not a chemist, nor a chemistry student, but an electrical engineer with some chemistry knowledge. However, for my work I have to deal with a problem, from which my question ...
1
vote
1answer
24 views

Derivation of formula for Hydrolysis constant

While studying acid-base equilibrium I thought I would derive the formula for hydrolysis constant myself. But I ended up getting a weird result and I am not able to understand where I went wrong. ...
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2answers
36 views

Why do we need three equations to find the pH of NaCN, given Ka(HCN)?

To find the pH of a 1.0 M solution of $\ce{NaCN}$, given $\ce{Ka(HCN) =4.9E(-10)}$ The solution (refer end of question) uses three equations: Equation 1 : $\ce{HCN + H2O <-> CN- + H+}$ ...
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0answers
23 views

Is tert -butoxide anion a strong enough base to react significantly with water? [closed]

Is tert -butoxide anion a strong enough base to react significantly with water? In other words, can a solution of potassium tert -butoxide be prepared in water? the pka of tert-butyl alcohol is ...
0
votes
3answers
66 views

The Reaction Between Nickel and Hydrochloric Acid

Having conducted an investigation involving multiple metals, I have found that nickel refuses to react with concentrated hydrochloric acid. I have even left the reaction overnight and still have seen ...
4
votes
1answer
36 views

Why does the Lewis definition of acids specify a PAIR of electrons and not a single electron?

The Lewis definition of an acid is: "a compound or ionic species which can accept an electron pair from a donor compound." Why does it specify a pair of electrons and not just a single electron? I ...
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0answers
17 views

Which metals are rendered passive by nitric acid? [duplicate]

Which metals are rendered passive by nitric acid ? Can't find a list anywhere.
1
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1answer
24 views

How to determine the theoretical carbonic acid concentration in soda water from a Soda Stream

I've seen it cited that commercial carbonation devices like a SodaStream put about 100 psi (700 kPa) of pressure to dissolve gaseous $\text{C}\text{O}_{2}$ in to solution. I've also heard that the ...
0
votes
1answer
28 views

Buffer Capacity Calculation

I know buffer capacity is the following: $$β=\frac{Δ(H+)}{ΔpH}$$ specifically the amount of acid/base that needs to be added to change pH by 1 unit. If I have data about how pH of a protein has ...
4
votes
1answer
184 views

What happens with enol and ketone

What process happens between an enol and a ketone, so that the ketone will enolate and become acidic? Please, explain what happens with them in this process?
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0answers
49 views

Why isnt ethanol a base? [duplicate]

Why isnt ethanol a base since it contains an OH group? I realize it is an alcohol but what happens when it is suspended in water?
-1
votes
0answers
11 views

Acids in aqueous solution [duplicate]

Why do acids donate a proton to water? For example, HCl. I realize it ionizes to form H+ and Cl- and the hydronium ion is formed. Why scientifically does this happen? Why does the H donate its proton ...
-4
votes
2answers
56 views

Why are ketones acidic?

I have found various sources saying that ketones are acidic (pKa=20), and then relate it to the formation of the enolate ion. However, isn't an enolate ion of a ketone basic due to the oxygen's ...
0
votes
0answers
21 views

Calculations for 0.05 M phosphate buffer, pH 6.7

This is probably a very simple problem, but I am trying to make a phosphate buffer $(0.05~{\rm M}, p\ce{H} = 6.7)$ from $\ce{KH2PO4}$ and $\ce{K2HPO4}$. Currently I am unsure I know the correct ...
1
vote
0answers
31 views

Why is ammonia more basic than phosphine? [duplicate]

The internet is filled with a number of reasons for this, but i don't know which to believe. So, why is $\ce{NH3}$ more basic than $\ce{PH3}$? Is it because nitrogen has more electron density due to ...
1
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2answers
33 views

Finding pH of HOAc after adding NaOH

$3\cdot 10^{-2}\ \mathrm{mol}$ of $\ce{NaOH}$ are added to a $1\,\mathrm{l}$ solution of $2\cdot10^{-2}~\mathrm{M}\ \ce{HOAc}$. Find the $\mathrm{pH}$ of the solution. I don't understand why my ...
0
votes
1answer
28 views

Finding OH- concentration given the H+ concentration - diverse methods

There was this exercise which asked to find the OH- concentration given the H+ concentration, i firstly calculated the pH as -log[H+], did 14-pH to find the pOH and then did 10^(-pOH) to find the ...
0
votes
1answer
27 views

Do I need to include calcium chloride in this reaction equation?

Yesterday I titrated a solution of calcium hydroxide in aqueous calcium chloride with $16.7~\mathrm{mL}$ of $\ce{HCl}$. More specifically, I took $25\ \mathrm{mL}$ of the calcium hydroxide in aq ...
0
votes
1answer
39 views

Is the deprotonation of phenol exothermic?

I just wanted to confirm that deprotonation reaction of weak acids are exothermic? I know that strong acids deprotonate exothermically (e.g. adding liquid $\ce{H2SO4}$ to water releases a lot of heat),...
3
votes
1answer
57 views

Why is hydrochloric acid often sold as 33% concentration?

What is the historical perspective for the choice of 33% concentration that is often found in commercial sales of Hydrochloric acid? Is this the same reason we find Sulphuric acid sold at 37% and ...
1
vote
1answer
53 views

Dissociation of HCl in aqueous solution

My question is regarding $\ce{HCl}$. In my book it states that: $$\ce{HCl (aq) -> H+ (aq) + Cl- (aq)}$$ I understand that when added to water the $\ce{H}$ leaves its electron to the $\ce{Cl}$ ...
3
votes
2answers
54 views

Can Henderson-Hasselbalch equation be used to determine the pH of a solution when a strong base and a strong salt of that base stay together?

The following problem I have stated was not given to me as a homework. I have found this one in my textbook. I have solved it in my own way, but I'm not sure about the correctness of my procedure. I ...
1
vote
1answer
34 views

How get a dilution at 150g/l of H2SO4 at 96%?

I've never done any chemistry before and I would like to get 5 liters of H2SO4 at a concentration of $150 [g/l]$. One liter of $H_2SO_4$ at $96\% $W/W has a density of $1.84 [g/ml]$. It means my ...
1
vote
1answer
63 views

Effect of pH on volatility (odor) of organic acid

Based on two assumptions: Ionic solutes can generally be considered nonvolatile As the pH of a solution of organic acid is increased, an increasing percentage of it is deprotonated, or ionized (...
1
vote
2answers
130 views

Under which criteria HNO3 is a concentrated or a diluted acid? [closed]

I would like to buy nitric acid to remove impurities of copper on an aluminum plate. I read that a 10% nitric acid will do the job. However I've also read that concentrated nitric acid is very ...
1
vote
0answers
39 views

Metaphosphoric acid and water in cold

Consider this redox reaction: $$\ce{3PCl3 + 2HNO3 (conc.) + 5H2O → 2NO + 3[HPO3] + 9HCl}$$ The metaphosphoric acid is taken in square brackets, because I have doubts about it. As I know, this ...
0
votes
1answer
19 views

Why is it correct to assume a neutral amino acid is entered in this problem?

The questions is: $1.812\ \mathrm{g}$ of a crystallized α-amino acid ($\mathrm{p}K_\mathrm{a1} = 2.4, \mathrm{p}K_\mathrm{a2} = 9.7$) has a $\mathrm{pH}$ of $10.4$ when dissolved in $100\ \...
1
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0answers
38 views

Acidity order of nitrophenols

As in other posts I have seen and learnt that, if one is given four compounds, namely para-nitrophenol, ortho-nitrophenol, meta-nitrophenol and phenol and is told to arrange them in order of acidity, ...
-1
votes
1answer
60 views

Hydrogen sulfide and sodium carbonate reaction

What is formed in the reaction between hydrogen sulfide and aqueous sodium carbonate? My guesses are sodium sulfite and/or sodium hydrogen sulfite. However, the equations don't seem to balance ...
0
votes
1answer
62 views

Why is the pOH of 1M HCl 14?

Why is the pOH of 1 molar HCl 14 in an aqueous solution? I was learning about strong bases and strong acids in chemistry within this context: We have 1L of pure water at 25°C, and the pH of water is ...
4
votes
1answer
46 views

Dissolving limestone in HCl and then neutralising the solution with NaOH

$15.0~\mathrm{mL}$ of $1.4~\mathrm{M}\ \ce{HCl}$ was mixed with $1.00~\mathrm{g}$ of limestone (impure $\ce{CaCO3}$) until all the solid had dissolved. The solution was then transferred to a conical ...
0
votes
1answer
32 views

Solubility of silver acetate in the presence of nitric acid

What will be the effect on the solubility of $0.1\ \mathrm{mol}$ of $\ce{CH3COOAg}$ in presence of $1\ \mathrm{l}$ of $0.1~\mathrm{M}\ \ce{HNO3}$ solution? $$K_\mathrm{sp} (\ce{CH3COOAg}) = 10^{-...
0
votes
1answer
69 views

Calculate the pH of Na2CO3

Given information: $K_\mathrm{a}(\ce{H2CO3}) = 4.3 \times 10^{-7}$, $K_\mathrm{a}(\ce{HCO3-}) = 4.8 \times 10^{-11}$, ${{\ce{[Na2CO3]}=0.20\ \mathrm{M}}}$ This was a question in an exam and I'm ...
0
votes
1answer
35 views

Proof of buffers inability to maintain exact same pH

I was wondering if the following is a legitimate proof of the statement above. Assume we have HA -> A- + H+ where [HA] + [A-] is our buffer. If we add a small amount of H+ one of two things will ...
9
votes
1answer
206 views

Reaction of Iron(III) with hydroxide ion

The observations: 1) Treatment of 1 mL of 0.05 M $\ce{Fe(NH4)SO4}$ solution with excess 1 M $\ce{NaOH}$ results in the formation of a rust-colored red-brown iron-based solution with many suspended ...
4
votes
1answer
73 views

Is there any notion of pH out of solution?

For example, could one define a $\mathrm{pH}$ for pure acetic acid? It's a weak acid in water, but if someone handed you $1~\mathrm L$ of pure acetic acid, what would its $\mathrm{pH}$ be?
6
votes
1answer
122 views

pH of liquid hydrogen chloride vs hydrochloric acid

Is hydrogen chloride in liquid state acidic like hydrochloric acid? I know that hydrochloric acid is hydrogen chloride dissolved in water but I was wondering if liquid hydrogen chloride was also an ...
0
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0answers
16 views

Uric acid removal from furniture (cat urine)

In relation to the chemicals used for cleaning specifically cat urine and enzyme cleaners what are or would be expected as active components and which will have a superior cleaning action, if ...
1
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2answers
82 views

Can nitrogens in urea be protonated?

Is it possible in very acidic solutions for the nitrogens ($\ce{N}$) to get another $\ce{H+}$, making it $\ce{R-NH2+-R}$? Since it has a free electron pair, it might be possible right? If so, at which ...
0
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0answers
13 views

Why does a flaky sediment appear when rusting iron nails in tartaric acid?

I am conducting an experiment on the fastest rate the rusting process can have in one of the 6 liquids I am using: saltwater, tap water, lemon juice, tartaric acid, oil and air. I recently checked on ...