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
31 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
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1answer
20 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
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2answers
108 views

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

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
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0answers
18 views

Correlation of pH estimation 0.1M KH2PO4 with the behavior of the base and acid constituents of the salt

My measured value for the pH of a $0.1~M \ce{KH2PO4}$ solution was $4.6$. This is close to the value obtained by assuming no role for the $\ce{K+}$ ion and considering the reactions of $\ce{H2PO4-}$ ...
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0answers
20 views

Acidity order of Halobenzene [on hold]

We know that the halide groups show $+R$ and $-I$ effect. Among this $+R$ effect tends to decrease the acidity and $-I$ effect increase the acidity of the group to which it is attached to. Now, in ...
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0answers
37 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
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1answer
17 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\ \...
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0answers
24 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, ...
0
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0answers
9 views

How to test calcium carbonate solubility by using Hcl ? What is its minimum range of solubility in Hcl, where it is using as a drilling chemical? [closed]

I tried to test the solubility of calcium carbonate in Hcl acid. but i dont know how to measure the reading by standard procedures and its minimum range of solubility.
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1answer
48 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
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0answers
19 views

Acids and Bases [closed]

Which one of the following acids require the largest volume of 1.00 mol/dm3 potassium hydoxide o neutralize? (A) 1.00 dm3 0.50 mol/dm3 H3PO4 (B) 1.00 dm3 1.30 mol/dm3 CH3COOH The answer given is (A)....
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0answers
15 views

Why is acetic acid stronger than p-hydroxybenzaldehyde [duplicate]

Why is acetic acid stronger than p-hydroxybenzaldehyde? There are more reasonance structures for p-hydroxybenzaldehyde so wouldn't that make it a better acid?
0
votes
1answer
60 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
45 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
29 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
60 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
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1answer
33 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
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1answer
181 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 ...
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0answers
26 views

Finding Oxidation numbers

Can someone tell me the concept for finding oxidation numbers? For example, NF3 nitrogen trifluoride how would one find the oxidation numbers for nitrogen and fluoride in that molecule ? I know it ...
4
votes
1answer
70 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
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1answer
108 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
14 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
59 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 ...
4
votes
1answer
106 views

Removal of octadecanoic acid from paraffin wax

I have some very plain candles. I don't think they contain anything but paraffin wax and octadecanoic (stearic) acid, since they are odorless and very hard to bend, tending to crack instead (even at ...
7
votes
3answers
1k views

Is the behavior of a dilute strong acid the same as the behavior of a weak acid?

My assumption is yes, as the $\mathrm{pH}$ levels of each will be similar and thus they have the same acidity. Is this correct or am I missing something?
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votes
3answers
45 views

Relation between strength and proticity of an acid

The strength of an acid is related to the number of molecules which have dissociated into hydronium ions in aq solution of that acid while proticity is the number of hydronium ions furnished by 1 ...
0
votes
2answers
34 views

Good acids for removing rust for experiments

I'm planning to conduct an experiment in which I test how fast rusting occurs with changes to the concentration of NaCl in the solution. I want to measure that by finding the change in mass of an ...
0
votes
0answers
43 views

why the Ka of water has such a nice value?

The Ka of water is exactly $1 \times 10^{-14}$, not something like $1.234 \times 10^{-14}$ or $3.1416 \times 10^{-14}$ as the case with most compounds. Is it a wonder of mother nature, or just an ...
5
votes
2answers
185 views

Is sulfide ion a stronger base than hydroxide ion?

I received these three responses. They are all, except the last response, incorrect to varying degrees. I am, however, unsure about how to grade these responses because the question itself, in my ...
2
votes
2answers
112 views

Is H+ (in an aqueous solution) = H3O+? [duplicate]

I was learning about autoionization in science and my science teacher wrote $\ce{H3O+}$ as $\ce{H+}$ — now, my intuition would lead me to assume that: $$\ce{H3O+} = \ce{H+}$$ But, $\ce{H+}$ is just ...
2
votes
1answer
70 views

At what pKa value do we consider an acid strong?

In between the traditional strong mineral acid that dissociate completely in aqueous solution, and obvious weak organic acid like acetic acid, things get murky. For example, oxalic acid has a $\...
3
votes
2answers
153 views

Titration problem

I am doing this titration question and am getting a different concentration to what it says in the answers. This is the question: $5.267~\mathrm{g}$ of $\ce{Na2CO3}$ was dissolved in $250.00\ \...
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votes
1answer
59 views

Why do some acids have pH 8? [closed]

Is it necessary for an acid to have pH less than 7? If no, please elaborate with examples.
0
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2answers
49 views

Phenolphthalein as a indicator for the titration of benzoic acid

Question: Justify the use of phenolphthalein $(\mathrm{p}K_\ce{in}=9.4)$ as a indicator for the titration of benzoic acid $(K_\mathrm{a}=6.3\times 10^{-5})$ with $\ce{NaOH}$. My attempt: I can ...
5
votes
1answer
158 views

How is NaOH able to clear a solution of Paraformaldehyde?

While making a solution of $4~\%$ para-formaldehyde for immunohistochemistry (to fix the tissue), we add para-formaldehyde into water and stir. It looks like a chalky supersaturated solution even ...
0
votes
0answers
28 views

Will boric acid react to Rochelle salt?

I am making a capacitor. But I wonder if the Rochelle salt in it will react to boric acid due to potassium and heating to the boiling point of water? It is simple copper aluminum plates, Rochelle salt,...
-1
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0answers
26 views

Identification of bases by pH paper

pH paper tells whether the solution is an acid or a base by looking at the concentration of H+ ions in the solution. When an acid is put into water H+ ions and the anions in the acid are released. ...
4
votes
0answers
64 views

What is the structure of trifluoromethanesulphonic acid in the gas phase?

During an interesting discussion in our group’s seminar, the question arose what actually causes trifluoroacetic acid to be a much better nucleophile than trifluoromethanesulphonic acid. Part of the ...
1
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1answer
39 views

Finding pH using the -log, why does my calculation differ from the book's answer?

An aqueous solution containing 0.0020 mol/L barium hydroxide, what is the pH? I do the following: 14-(-log(0.0020))=11.3pH. The answer is 11.6. 2.0*10^-3 mol/L sodium hydroxide solution, what is the ...
1
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0answers
23 views

Reaction of Phenolic acids

I'm puzzled as to what can happen to phenolic acids when they are heated. (Chemistry, not health or food science) How do they dehydrate? Do they form anhydrides? Also, is it possible for the ...
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votes
1answer
40 views

Nature of urea and it's relation with uric acid

My question is what is the nature of urea. I checked it on the Internet and according to my results, the nature of urea is basic. Then why is there uric acid? For example when we add magnesium oxide ...
0
votes
1answer
38 views

How does diluting an acid change pH?

By the Henderson Hasselbach equation, log (salt)/(acid) term is a ratio of the concentrations. So, how can dilution change the pH of the acid as the concentrations of both salt and acid would change ...
1
vote
2answers
42 views

Identifying base in a chemical equation

According to the Bronsted Lowry principle, "base" is a proton acceptor. I've tried to apply this idea to every choice as you can see these red circles in each equation below, but they are all loses ...
3
votes
2answers
152 views

Is the concentration of negative ions always equal to that of positive ions?

Is there any way in which a solution can have more negative charge than positive charge, or vice versa? For example, in the context of acid-base chemistry, is there any scenario in which $[\ce{H+}]\ne[...
2
votes
1answer
45 views

Does the addition of water to N2H4 produce N2H4

I am currently calculating the $\ce{pH}$ of a species. The reaction is as follows, $$\ce{N2H4 + H2O <=> N2H_{$A$}+ + OH-}$$ However, I'm not sure what the value of $A$ will be. In my ...
0
votes
1answer
31 views

Sodium fluoride and varying pH - HF risk

I'm looking into conducting an experiment on the adsorption of fluoride (for my International Baccalaureate Extended Essay). As I will be investigating the role of $\mathrm{pH}$ in adsorption capacity,...
3
votes
2answers
45 views

Zwitterions/IEP of glycine at pH 6? (Paradox?)

I am trying to understand an experiment: Some crystalline, solid glycine was solved in water and a pH=6 was measured (also calculable with $\mathrm{pH} =\frac{1}{2}(\mathrm{p}K_\mathrm{a1} + \mathrm{p}...