Questions tagged [acid-base]

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 pair of electrons capable of forming a covalent bond with a hydron/ proton (Brønsted base) or with the vacant orbital of some other species (Lewis base).

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0answers
7 views

High temperature acids

Some of the proton production of an acid happens due to temperature and some of the proton production of an acid happens due to quantum tunnelling.But if we increase the temperature a lot then the ...
8
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1k views

Comparing pKa of hydrocarbons

We have to compare their acidic strength, and we know acidic strength is directly proportional to stability of the anion. So the first compound is more acidic due to its being aromatic after ...
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15 views

Calculating the pH of a mixture of glycine and sodium hydroxide

What is the pH of a total 500 ml solution of 0.20 mol of glycine and 0.025 mol of NaOH? I believe the pKa of the amino group is approximately 9.6; the pKa of the carboxylic acid group is 2.8. Are ...
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2answers
1k views

How to calculate the composition of a borate buffer with a defined pH using the Henderson-Hasselbalch equation?

I am struggling with what appears to be an extremely easy pH problem that uses the Henderson-Hasselbalch equation. The problem and answer provided by the book is given below. I understand where the ...
2
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1answer
158 views

Show the acid nature of hydrogen sulfide

We are studying the chalcogens at school. I should prove (show) the acid nature of $\ce{H2S}$ by writing two chemical interactions. I am really sorry if the terms I am using aren't the right ones. It'...
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4answers
1k views

Why does adding salt to water reduce the pH?

I recently heard someone claim that adding table salt to vinegar caused HCl to form which helped them clean coins - clearly not the case - however I thought I'd disprove it by doing an experiment. So ...
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1answer
36 views

Reduction of amides with lithium aluminium hydride [on hold]

Since $\mathrm{p}K_\mathrm{a}$ of primary amides are close to alcohols, will there be an acid-base reaction between amides and $\ce{LiAlH4}$ besides reduction?
2
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0answers
11 views

Acidic strength of phenol derivatives

While comparing the strengths of o-nitrophenol and p-nitrophenol, p-nitrophenol is found to be more acidic. The reason I studied for this is $\ce{H}$-bonding in o-nitrophenol which makes the acid more ...
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2answers
85 views

Why aren't plastic bottles of coca cola full of microplastics?

My understanding is that disposable plastic water bottles should not be reused or used at all after some time, because the bottle will eventually leech microplastics into the water. Since coca cola is ...
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0answers
18 views

Calculate pH of borax-boric acid buffer solution?

In a recent experiment I made a borax-boric acid buffer solution by dissolving 9.535 g of borax in water and adding 92 ml of 0.1 M HCl. The pH of this solution was given as 9.00. I then took 20 ml of ...
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24 views

Need help, thanks [on hold]

A concentrated strong acid is added to a solid mixture of 0.015mol samples each of Fe(OH)2 and Cu(OH)2 placed in 1.0L of water. At what values of pH will the dissolution of each hydroxide be complete? ...
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31 views

Hydronium ion concentration to compare pH values

I'm having a bit of trouble with this question: Which has a higher $\mathrm{pH}$ value, $\pu{0.001 M}$ $\ce{HCl}$ or $\pu{0.1 M}$ $\ce{CH3COOH}$ $(K_\mathrm{a} = \pu{1.8E-5})?$ I have calculated ...
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49 views

How can you use indicator titration to determine the pH of a complex solution like ocean water if at all

Could you measure the pH of ocean water by using a strong acid-weak base titration? I was thinking that you could set up a standard titration with ocean water as the "unknown", and drip the known HCl ...
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32 views

Boiling nitric acid and gold plating

I was watching a YouTube video "Home Brew Gold Plating" by Cody'sLab and had a few questions. In the video to dissolve the gold first he creates a mixture of $\ce{HCl}$ and $\ce{HNO3}$ (aqua regia). ...
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1answer
120 views

Mechanism for the reaction between trisilylamine and hydrogen chloride

In Concise Inorganic Chemistry by J. D. Lee (adapted by Sudarsan Guha), in the chapter "Chemical Bonding", under the topic "Back Bonding with Nitrogen as a donor atom" the following reaction is given: ...
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20 views

In Titration, what is the RSD in ppp given a new RSD. Just like the picture attached [closed]

ABN amdbma nadnb anbdnab nadnbd dansbdna anbdna nadnabdna dnabdnabdna dnadnabdn anbdnad anbdnas Look at the picture attached.
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HCN risk in neutralization process [closed]

What information would you need to estimate the risk of evolving hydrogen cyanide gas from neutralization of alkaline cyanide-containing rinse water with iron-containing spent pickling liquid (...
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1answer
36 views

Do acids and bases react with salts [closed]

My teacher says that if we were to react a weak acid with a basic salt, for example: (HA + KB) that the acid will react with the base contained in the salt (B -) and it will yield (HB + A -). Is this ...
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2answers
26 views

How do you know is a solution is acid or basic when you dissolve a weak acid/base? [closed]

If I dissolve the weak acid HCN into water, I get a solution of oxonium and CN ions and since there is an equilibrium there is more HCN left. So I thought CN ions can consequently react with water to ...
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3answers
75 views

Confusion on ion product of water

The ion product of water is defined as $$ K_w = [\ce{H+}][\ce{OH-}] $$ and in pure water $ [\ce{H+}] = [\ce{OH-}]= 1.0 \times 10^{-7}$ and $ K_w = 1.0 \times 10^{-14}$. It is said that if we dissolve ...
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3answers
86k views

Reaction between NaOH and CO2

So I wanted to know what the reaction between sodium hydroxide and carbon dioxide can be, and upon research I got 2 answers. The first one is $$\ce{CO2 + NaOH(aq) -> NaHCO3(aq)}$$ and the second ...
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28 views

How to calculate Revelle factor using only pH, DIC and TAlk for seawater?

I have the temperature, salinity, $\mathrm{pH},$ dissolved inorganic carbon (DIC) and total alkalinity (TAlk) values for an estuarine water sample. I want to calculate the Revelle factor. The Revelle ...
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1answer
37 views

Which substances are unquestionably acids or bases, regardless of the definition of acids and bases? [closed]

Seeing that there are more than one definitions of acids and bases, I'd like to know what were the substances that people were trying to wrap under the category of acid or base. Or what were the ...
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1answer
57 views

Determine pH change of strong acid diluted in water [closed]

$\pu{8000 L}$ of sulfuric acid with concentration $\pu{5.3E-7 mol/L}$ and density mass $\pu{1.7 kg/L}$ leaked into the water with $\mathrm{pH} = 6.6$ and volume $\pu{2.1E11 L}$. What $\mathrm{pH}$ is ...
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2answers
171 views

How to find the ionization constant of an unknown weak acid?

A $\pu{0.45 M}$ solution of a weak acid, $\ce{HX}$, has a $\pu{pH}$ of $4.5$. What is the ionization constant, $K_a$, of the acid? $\ce{[HX]}$ is already given as $\pu{0.45 M}$. $\ce{[H+]}$ is given ...
3
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1answer
138 views

Impossible pH For Aqueous Weak Acid Solution

An aqueous solution of $\ce{HCl}$ has a $\mathrm{pH}$ of $0.00$ if $[\ce{H+}] = 1.00 \; \mathrm{M}$. I tried to see if an aqueous solution of acetic acid could have a $\mathrm{pH}$ of $0.00$, given ...
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1answer
44 views

Acid-base titration: Unknown base in burette or flask?

While finding the concentration of $\ce{NaOH}$ via titration with $\pu{0.05M}$ Oxalic acid solution (in our lab) we put NaOH in the burette whereas added phenolphthalein to oxalic acid in titration ...
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2answers
10k views

Reactions of alkynes with sodium/ammonia vs sodium amide

What happens when alkynes react with sodium in ammonia ($\ce{Na/NH3}$), or when they react with sodium amide ($\ce{NaNH2}$)? Are these two sets of conditions different?
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1answer
44 views

When disolving a iron pill for titration, why do I use sulfuric acid instead of nitric or hydrochloric acid?

In a titration to decide the iron content of a pill we dissolved the iron in sulfuric acid and then titrated it with cerium(IV) sulfate. But I just wondered what's wrong with using nitric and ...
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1answer
35 views

The reaction of an oxyacid with water [closed]

I read in my book this: $$\ce{H2SO3 + H2O -> HSO3- +H3O+}$$ while I rather would write (not balanced): $$\ce{H2SO3 + H2O -> 2 H+ + SO3^2- + 2 H2O -> SO3^2- + 2H3O+}$$ I mean I don't ...
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501 views

Effect of H-bonding on o-nitrobenzoic acid

My argument here is regarding the acidity of o-nitrobenzoic acid being greater than p,m-nitrobenzoic acid. In o-nitrobenzoic acid, there is an intramolecular hydrogen bond which makes the bond ...
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2answers
69 views

Finding pH of acid in water [closed]

How would you find the pH of an acid dissolved in water? Would you need to take the fact that the pH of water is already 7 into account and go on from there? Say, for example, that you add 0.0500 mL ...
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1answer
34 views

Type of reaction between (+)-bis salt of (+)-phenylsuccinic acid and HCl [closed]

Im confused about what type of reaction occurs between the (+)-bis salt of (+)-phenylsuccinic acid and HCl. Would this be considered an acid base reaction or a neautralization reaction? MY THOUGHTS: ...
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0answers
50 views

Can pure water dissolve metal? [duplicate]

Recently I've fallen for the following clickbait from Business Insiders: A golden chamber buried under a mountain in Japan contains water so pure it can dissolve metal, and it's helping scientists ...
3
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1answer
2k views

Acidic and alkaline salt solutions: why do some salt form acid/bases while others don't [closed]

I have a question regarding salts and their solutions. How come some salts, like sodium carbonate and ammonium chloride, produce acids/bases when dissolved in water? Moreover, how can you predict ...
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1answer
69 views

Why is the pH level of carbonation loss decreasing then increases afterwards?

We have done an experiment of the titration of unsealed sprite soda to find the amount of carbonic acid being loss on various duration (0 to 1 hour), due to decrease pressure. The calculation was to ...
7
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3answers
14k views

Why amino acids (Zwitterion) become either negative or positive at low and high pH solutions?

The amino acids are Zwitterions. In neutral pH, an Amino acid's amino group has a postive charge and Carboxyl group has negative charge. They cancel each others charge thanks to the $Hydrogen$ that's ...
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1answer
299 views

Peptide at pH=1

In the following peptide: I want to know the net charge of the peptide at pH=1. According to me the as the solution is acidic so every nitrogen will get protonated. Hence the number of charge = ...
3
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1answer
849 views

Calculating charge of amino acids (am I doing it right?)

Please consider this picture of a peptide chain: I've done some examining on the different amino acids and concluded that the chain is as follows: Lys-Leu-Gly-Ser-Citrullin (variant of arginine). I ...
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45 views

pKa values for amino acid

To calculate the pI value, we take the average of the pKa values from the 2 groups that result in a net charge of 0. For that to happen, the pKa values should be at the midpoint of titration where ...
11
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1answer
39k views

How do I calculate the isoelectric point of amino acids with more than two pKa's?

For most amino acids, the $\mathrm{pI}$ is simply the mean of the amino and carboxyl $\mathrm pK_\mathrm a$'s. However, for tyrosine and cysteine, which have more than one $\mathrm pK_\mathrm a$ value,...
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2answers
6k views

Why do vinegar and other acids remove rust?

I have started a project on restoring a very rusty knife. I had used vinegar to remove the rust. A question dawned on me: why does vinegar remove rust? So being the thoughtful person I am, I googled ...
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21 views

Calculating pH of a saturated weak acid/base solution [closed]

How can you calculate the $\mathrm{pH}$ if you know for example the $\mathrm{p}K_\mathrm{a}$ or $\mathrm{p}K_\mathrm{b}$ value of a weak acid/base and how much acid/base can dilute in water. Let's ...
2
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0answers
31 views

Basicity comparison between pyridine amines and other compounds

In cases 1, 2, 3, the compounds will resonate, thus giving them more stability. Firstly, I want to know whether nitrogen has a +M effect? (due to it having a lone pair of electrons?) In case 1, ...
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3answers
74 views

n-Factor of phosphorous acid

It's very confusing that while $\ce{H2SO4}$ has an $n$-factor of 2, whereas $\ce{H3PO3}$ has $n$-factor 2 instead of 3. Many tried explaining it to me by molecular structures, but I don't know how to ...
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1answer
42 views

Difference of Ascorbic acid dissolved or precipitated in Glycerol?

Difference of Ascorbic acid (AA) dissolved or precipitated in Glycerol? Referring to pat US20110008445A1 Solution 1 At 25C, AA was dissolved in glycerol and alcohol (subsequently removed by ...
2
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1answer
117 views

Is barium sulfate soluble in dilute mineral acid?

I have read that $\ce{BaSO4}$ is soluble in $\ce{HCl}$ , but I am not sure whether this works for dilute acid as well. The reaction is - $\ce{BaSO4 + 2 HCl ->BaCl2 + H2SO4}$
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2answers
2k views

Will cinnamaldehyde undergo self-aldol condensation?

Will cinnamaldehyde undergo self-aldol condensation? My book says it won't, but since it has an α-hydrogen, I'm confused.
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1answer
3k views

Why is lemon mixed with water considered alkalizing water?

The benefits and facts of alkaline water are often skewed due to the marketing of companies and uneducated hype for the innocent idea of unlimited potential. I wanted to know the specific reactions ...
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2answers
6k views

Order of acidity of water, an alcohol, an amine, and acetylene

What is the order of acidity of $\ce{H2O}$, $\ce{ROH}$, $\ce{RNH2}$, $\ce{C2H2}$? I began by forming the conjugate base of each. The conjugate bases are as follows $\ce{-OH}$, $\ce{-RO}$, $\ce{-RNH}$,...