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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Will silicon dioxide react with hydrochloric acid?

I have the following equation, based on the reaction of $\ce{SiO2}$ with $\ce{HF}:$ $$\ce{SiO2 + HCl -> SiCl4 + 2 H2O}$$ I want to know if this reaction is indeed feasible, what conditions may be ...
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0answers
32 views

Is phosphoric acid is strong acid or weak acid? [duplicate]

Is phosphoric acid is strong acid or weak acid? I read in a book that basicity of Phosphoric acid $\ce{H3PO4}$ is $3$, but besides that it says phosphoric acid is a weak acid. this confuses me. if ...
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1answer
53 views

Titration of barium(II) hydroxide by hydrochloric acid

$\pu{25 ml}$ of $\pu{0.024 M}$ $\ce{HCl}$ is titrated into a volumetric flask which initially contains $\pu{45 ml}$ of $\pu{0.034 M}$ $\ce{Ba(OH)2}$. Calculate the $\mathrm{pH}$. This is how I ...
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32 views

Can carbon monoxide become entrained in water, and will it affect the pH of that water? [on hold]

A hot gas containing $\ce{CO2}$ and $\ce{CO}$ will pass through a water cooler. I know that $\ce{CO2}$ can be dissolved in the water, form carbonic acid, and lower the $\mathrm{pH}$ of the water. Will ...
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40 views

Is there a reliable chemical theory that predicts pKa based on structure? [on hold]

Obviously, there are general stability arguments that can be made to estimate relative pKas, such as evaluating the stability of the conjugate base of an acid, or thinking about how polarized the bond ...
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1answer
47 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 ...
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1answer
58 views

How do I write a procedure for creating a buffer?

I need to write an original procedure with exact numbers for creating a buffer: Create a buffer using $\ce{CH3COOH}$ and $\ce{CH3COONa}$ that has a $\pu{pH}$ of exactly $3.75$. A $\pu{50 mL}$ ...
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16 views

Why might litmus paper and universal indicator give conflicting pH readings in an acid-carbonate reaction?

The resulting neutralised (which wasn't actually neutralised due to not realising CaCO3's insolubility) solution between Hydrochloric Acid and Calcium Carbonate, as per balanced equation CaCO₃ + 2HCl ...
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1answer
28 views

Acid/Base Indicator [on hold]

I'm not sure how the concept and math work on this problem. Can someone show me how you can get the answer, both conceptually and using math?
3
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1answer
120 views

How to create a buffer using CH3COOH and CH3COONa that has a pH of exactly 3.75?

I need to create a buffer using $\ce{CH3COOH}$ and $\ce{CH3COONa}$ that has a pH of exactly $3.75$. A $\pu{50 mL}$ sample of your buffered solution will have to be able to withstand the addition ...
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1answer
25 views

Calculating the pH of Strong Acid Solutions [on hold]

Calculate the $\mathrm{pH}$ of a $\pu{1.5e–11 M}$ solution of $\ce{HCl}.$ How is the $\mathrm{pH}~7?$
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15 views

Sulfuric Acid danger [on hold]

I have access to a large quantity of salvaged timber which was used in an industrial process of paint (yellow) production. The wood was arranged vertically in barrel staves approximately 25’ long ...
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1answer
34 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 ...
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1answer
41 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
4k views

What is purpose of sulfuric acid in iodine extraction?

I am trying to extract iodine from kelp following this guide here. It calls for sulfuric acid, but I don't see what this does do help the reaction. I thought the reaction was simply oxidizing iodide ...
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1answer
26 views

How to make an aluminumoxide coating on an electrode?

The Questions is above. I am not a chemist but that is what I know: Aluminum has an Oxide Layer normally Aluminum-Oxide Layer can be broken down with NaOH Zink coatings are done by galvanic coating ...
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22 views

Amphoterism and the Metal and Non-Metal Oxides/Hydroxides. Why does amphoterism occur in these?

I am having trouble understanding why Beryllium Oxide and Aluminum Oxide are amphoteric. Also, while they are not oxides, Aluminum and Beryllium Chloride as well. Most of the things I have been ...
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2answers
321 views

Chemical water treatment: Acid Base reaction

I was thinking of a hypothetical waste system that uses nanotechnology to its advantage. At the individual level, waste just passes through into pipes when flushed like it normally does. But once it ...
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2answers
73 views

Low-cost nontoxic corrosion inhibitor for steel exposed to hydrochloric acid

It seems that many commercial descaling solutions designed to remove scale (calcium carbonates, etc that form on water heaters) are a simple combination of an acid and an acid corrosion inhibitor for ...
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2answers
83 views

Understanding the increase in pH of a buffer solution upon incremental additions of NaOH analytically

So let's say we have $200$ mL of $1$M $CH_3COOH$ solution. In this solution we have the equilibrium $CH_3COOH \rightleftharpoons CH_3COO^- + H^+$. To that we add $100$mL of $1$M $NaOH$ solution.Then ...
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4answers
6k views

What is more acidic: D3O+ in D2O or H3O+ in H2O and why?

What is more acidic: $\ce{D3O+}$ in $\ce{D2O}$ or $\ce{H3O+}$ in $\ce{H2O}$ and why? I think it's $\ce{D3O+}$ in $\ce{D2O}$ as I saw somewhere that this property is used in mechanistic studies (...
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1answer
66 views

Why does pH of a buffer solution change according to Henderson–Hasselbalch equation? [closed]

If I add a little amount of acid or base to a buffer solution, the pH of the buffer won't change. That's what the diagramatic mechanism tells us. But according to Henderson–Hasselbalch equation, the $...
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2answers
55 views

Can antimony pentafluoride be made by adding hydrogen fluoride to antimony trifluoride?

I was looking at how the strongest acid was made and I found something I did not understand. On the Wikipedia page for antimony trifluoride it shows the production of $\ce{SbF3}$ using $\ce{HF}$: $$\...
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1answer
28 views

Evaluate indicator choice (phenolphthalein)

A student wishes to find the concentration of a $\pu{50 mL}$ solution of acetic acid $(K_\mathrm{a} = \pu{1.8e-5}).$ He performs a titration using a solution of $\pu{0.2 M}$ sodium hydroxide. The ...
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1answer
35 views

What makes a compound basic? [closed]

Aluminum chlorohydrate is often referred to as basic aluminum chloride. The pH value of ACH is about 4. How is basicity in this context defined?
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3answers
280 views

How would a pH curve look like for titration of diluted weak base compared to concentrated one?

Let's say I take $\pu{80 g}$ of a weak base, dilute it with $\pu{50 ml}$ of water and titrate it with a strong acid. I get a titration curve. Now I take again $\pu{80 g}$ of the same weak base but ...
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9answers
9k views

Would it be possible to destroy gold?

I'm a writer. I have a scenario in which a sizable amount of gold needs to be rendered unusable, preferably completely destroyed. I know an acid like aqua regia is able to dissolve gold, but would ...
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1answer
35 views

is every molecule either a base or acid

I read today that water is a base because it can receive a proton when mixed with some acids. That got me thinking: is every single molecule capable of either donating or receiving a proton -- when ...
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0answers
10 views

How do I go about either finding or calculating Aluminum-Oxalate salt solubility values in aqueous medium?

Water would contain other salts which may complicate things a bit. But finding out the Aluminum-Oxalate salts solubility values in pure water would be a good indicator already. It's for temperatures ...
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2answers
2k views

How to remove stain from pavement after having dropped sulfuric acid on it?

I had this car battery that flipped in my car trunk. When I got it out of there it spilled some acid on the pavement. It's a sulfuric acid battery. I added some baking soda on it and poured some more ...
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0answers
41 views

Polar Protic and Aprotic Solvents

I know $\mathrm{S_N2}$ is favored polar aprotic solvents, which means that they may have hydrogens on them somewhere, but they lack $\ce{O-H}$ or $\ce{N-H}$ bonds, and therefore cannot hydrogen bond ...
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0answers
23 views

Difference between Ascorbate & Semi-DHA (both C₆H₇O₆)

I wanted to know how Sodium Ascorbate functions in the AA family of molecules. However, all normal routes lead to dead ends (typically AA). Forcing NCBI to search only for Sodium Ascorbate mostly ...
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0answers
24 views

Coupling Reaction

I have an antibody with primary amine one terminal end. I want to couple it with liposomes containing DSPE-PEG-Maleimide. What are possible conditions of reaction and is it possible to attach this ...
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1answer
34 views

Order of acidic strength of oxides

Select the correct order of acidic strength of oxides: (A) $\ce{SO2} > \ce{SO3} > \ce{CO2}$ (B) $\ce{Cs2O} > \ce{K2O} > \ce{Na2O}$ (C) $\ce{CO2} > \ce{N2O5} >\ce{B2O3}$...
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2answers
59 views

How do we know if a compound is amphoteric or not?

My teacher told me if it reacts with an acid and a base, then the compound is amphoteric. However, I am not satisfied. Is there any other way of telling? For example we are give a compound say BeO, ...
6
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2answers
650 views

Buffer solution calculation

Preface: Buffer solution (acid-base buffer). I am provided with a weak base, which I will designate B. $\mathrm{p}K_\mathrm{a}$ for B's conjugate acid--which I will designate BH--is 8.1, and its mole ...
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1answer
75 views

Kb values of N,N-dimethylaniline derivatives [closed]

I need the $K_\mathrm{b}$ values for ortho-, meta- and para- positions of the following compounds: I've looked and couldn't find them anywhere.
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2answers
236 views

How are neutral amines effective bases in organic chemistry?

I have found it to be rather strange that neutral amines, such as triethylamine or DIPEA, find applications in organic chemistry in deprotonating alcohols or even α-carbonyl compounds. Amines are ...
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0answers
27 views

Acid and base separation on an anion exchange column [closed]

I'm new with this concept and so I would need some advice. I want to separate an acid and a base in a water solution. The acid has $\mathrm{p}K_\mathrm{a}(\ce{HA}) = 5$ and the corresponding acid of ...
2
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0answers
24 views

Hydrolysis of an amidine derivative under acidic conditions

I know that an imine can undergo acid hydrolysis to yield a corresponding amide: https://chem.libretexts.org/@api/deki/files/13283/10.jpg?revision=1 But I am looking at a mechanism for acid ...
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2answers
445 views

NaHCO3 required to raise pH of weak HCl solution from 3.5 to 7.2 (doubting my calculations)

I'm a dentist, working on a medical device that will make shots at the dentist office hurt a lot less. The device mixes a drug (2% Lidocaine) that has been acidified with $\ce{HCl}$ to pH 3.5 for ...
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0answers
64 views

Resonance forms of deprotonated hydroquinone

What resonance forms stabilize deprotonated hydroquinone? Deprotonated hydroquinone looks like this: Possible resonance forms include: 1 and 2 look reasonable: they don't carry multiple charges. My ...
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0answers
51 views

Calculate the pH

Calculate the pH of a dissolution of 100 ml of 0.1 M solution of ammonium chloride in the style of 100 ml of 0.1 M hydrochloric acid solution $\ce{NH4Cl -> NH4+ + Cl-}$ $\ce{HCl -> H+ + Cl-}$ ...
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2answers
605 views

Why are synthetic pH indicators used over natural indicators?

Synthetic indicators seem to be exclusively used when determining the pH of a substance with an indicator (with the exception of that school experiment where you boil cabbage to demonstrate natural pH ...
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2answers
45 views

Is this balanced redox equation correct? [closed]

I'm trying to balance an equation using oxidation numbers $\ce{MnO4^- + H+ + Cl- -> Mn^2+ + Cl2 + H2O}$ my suggestion: $\ce{MnO4- + 8H+ + 5Cl- → Mn^2+ + 2.5Cl2 + 4H2O}$ the 2.5 $\ce{Cl2}$ is ...
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0answers
16 views

How do I go about calculating which of several carbonates would most easily decay when exposed to an acid?

For instance, I'd want to compare CaCO3, ZnCO3, MgCO3, etc and find out which one will decay with the least amount of an acid? Which laws / principles are involved that I'd need to find out how to ...
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1answer
54 views

What is the pH at both equivalence points of titration between diprotic tartaric acid and NaOH?

Here's all the info I have and my attempt in solving the question: The chemical equation for the titration: $$\ce{C4H4O6 + 2NaOH -> Na2C4H4O6 + 2H2O}$$ Here are the 1st and 2nd $\mathrm{Ka}$ ...
6
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3answers
39k views

How to rationalise that when we dilute a weak acid, the pH increases but also the dissociation increases?

When water is added to a weak acid like ethanoic acid, the number of ethanoic acid molecules that dissociate increases, however, pH increases (less acidic), too. Why is this so?
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1answer
21 views

How do I calculate the proportion of respective conjugates of one base mixed with several acids (and/or conversely) at different temperatures? [closed]

How do I calculate the proportion of respective conjugates of one base mixed with several acids (and/or conversely) at different temperatures, and is there a free software tool that would allow me to ...
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3answers
50 views

4-Bromophenol vs 4-aminophenol pKa in water comparison confusion

Recently the other week, I was asked the following question: Would you expect 4-aminophenol to have a higher or lower pKa than 4- bromophenol when measured in water? And I thought about this on ...