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 ...

learn more… | top users | synonyms (2)

5
votes
2answers
60 views

Is ciprofloxacin acidic or basic?

I would expect an aqueous solution of ciprofloxacin to be basic for the following reasons: The carboxyl group has pKa = 6.09 and the secondary amino group has pKa = 8.74. Because 8.74 is further ...
-1
votes
1answer
25 views

Adding a weak acid to a concentrated solution of HCl [on hold]

let's say we have a concentrated solution of $\ce{HCl}$ and we add a dilute solution of weak acid to it. Will the solution become more or less acidic? The number of $\ce{H+}$ ions will increase but ...
0
votes
1answer
23 views

Will this series of reactions work to produce potassium phosphate?

I want to end up with a solution or anhydrous sample of potassium phosphate with which I can grow larger crystals. I want a challenge and something to do so I don't want to buy potassium phosphate, I ...
3
votes
1answer
37 views

Na2HPO4 is amphoteric: write the two reactions

$\ce{Na_2HPO_4}$ is amphoteric, which means it can act as a base or as a acid depending on which substance they react with. This is the reaction in which disodium phosphate appears to be an acid: ...
-3
votes
0answers
45 views

A problem in ionic equilbrium

Question 1998(b) My attempt: I thought that $\ce{AgCl}$ would yield $\ce{Ag+}$ and $\ce{Cl-}$ ions, whose concentration can be found from $K_{sp}$ as $\sqrt{K_{sp}}$. This $\ce{Ag+}$ reacts with ...
3
votes
0answers
22 views

Application of limiting reagents and acid-base stoichiometry

I'm having a bit of trouble with the latter questions of this problem. 15.0mL of 1.4M $\ce{HCl}$ was mixed with 1.00g of $\ce{CaCO_3}$ until all the solid had dissolved. The solution was then ...
14
votes
1answer
649 views

Why is pyrimidine less basic than pyridine?

From Wikipedia's article on pyrimidine: Because of the decreased basicity compared to pyridine, electrophilic substitution of pyrimidine is less facile. But why is pyrimidine less basic than ...
3
votes
2answers
50 views

Can triethylamine/pyridine be used in this reaction?

As part of my homework, I had to plan the synthesis of labetol, a blood pressure drug, from its component parts. One of the steps involved was the following $\mathrm{S_N2}$ reaction: The solutions ...
3
votes
1answer
51 views

Understanding effect of ph on solubility of salt

In the following picture why Ksp is not simply S2- ? Why is f included with one species only? Please explain the last part. What does f represent and why it is used in molar solubility?
1
vote
0answers
29 views

How can eosin be acidic and negative at the same time?

The broadest acid-base definition is done by Lewis and he states that a lewis acid is: "a compound or ionic species which can accept an electron pair from a donor compound." And all the sources say ...
2
votes
0answers
16 views

How does pH level change the concentration of dissolved oxygen (DO) in sea water?

I am planning to investigate the relationship between $\mathrm{pH}$ and dissolved oxygen. I would like to have a reason without taking in account the plants, animals and decomposer roles. I want to ...
1
vote
1answer
34 views

How to filter out magnesium acetate (a soluble salt) quickly and cheaply from water

I am conducting an experiment that involves reacting a weak acid and a weak base to form water and a salt with this overall equation $$\ce{Mg(OH)2(s) + 2CH3COOH(l) <=> 2H2O(l) + ...
5
votes
0answers
29 views

Collective term for acid/base; hydronium/hydroxide

When writing about acids and bases it would seem very natural for me to abstract the set of both acids and bases and have a single noun for them, instead of cumbersomly listing them both each time. ...
0
votes
0answers
41 views

Determine if an acid base reaction will occur

I'm wondering why some acid base reactions occur, let's say for example: $$\ce{CH3CH2OH + H2O <<=> CH3CH2O- + H3O+}$$ Why does this reaction occur, because the alkoxide ion is a really ...
1
vote
0answers
23 views

Why resonance doesn't play on meta?

My professor said while explaining the acidic nature of phenol that meta-nitrophenol is less acidic than para-nitrophenol, and gave reason that resonance doesn't play on meta, but I didn't get it.
0
votes
1answer
26 views

Why is NaHCO3 a basic salt? [duplicate]

When NaHCO3 is added to water should give an H$^+$ ion in water and this should make it acidic. Why is it a basic salt? Does it have something to do with H2CO3 being a weak acid?
0
votes
0answers
15 views

How to calculate Normality of H3PO4 in given Chemical Equation?

In the Chemical equation, 1 mole of P$_2$O$_5$ hydrolyses to yield H$_3$PO$_4$. What is the Normality of the H$_3$PO$_4$ so formed (volume 1 L) My Approach: Since 1 mole of P$_2$O$_5$ yield 2 mole ...
-1
votes
0answers
17 views

Separation of Hydrochloric and hydroflouric acid [closed]

How can I separate mixture of HF, HCl and H2O at 200 F and atm pressure?
1
vote
0answers
43 views

Why isn't the ion-product constant the sum of the molar concentrations of H+ and OH-? [duplicate]

The Chemistry texts I have present the ion-product constant as: $$K_\mathrm w= 1.0 \times 10^{-14} = [\ce{H+}][\ce{OH-}]$$ Additionally I'm told that this constant at (25 °C) is an equilibrium. As ...
0
votes
0answers
36 views

Hydronium Salts

When it comes to solids, hydroxide salts are quite abundant. There is $\ce{Mg(OH)_2}$, $\ce{NaOH}$, $\ce{CsOH}$, $\ce{Ca(OH)_2}$, and $\ce{Fe(OH)_3}$, just to name a few. However, (correct me if I'm ...
1
vote
1answer
16 views

Solubility of compound in acid

I have a substance that is insoluble in water but soluble in hydrochloric. If dissolve this substance in the acid, would neutralizing the solution with sodium bicarbonate then cause the substance to ...
1
vote
1answer
22 views

Volume of dibasic acid required to neutralise 0.04 mole of OH-

The volume of 0.1 N dibasic acid sufficient to neutralize 1 g of a base that furnishes 0.04 mole of OH− in aqueous solution is: 200 mL 400 mL 600 mL 800 mL Since it is a ...
1
vote
1answer
41 views

Why does a buffer work best at the pH closest to its pKa?

I think I'm having trouble understanding exactly how the pKa relates here on a conceptual level. For example I know that carbonic acid works somewhat well as a buffer at pH near 7, since its pKa is ...
3
votes
1answer
90 views

Is Magnesium Sulfate basic, neutral or acidic?

A question in my college test asked whether MgSO4 is neutral, acidic or basic. I was told that you can solve this kind of problem by hydrolysing any ions that do not "come from" a strong acid or a ...
3
votes
2answers
50 views

Why is solid sodium hydride a base and not an acid when reacted with water?

When solid $\ce{NaH}$ is mixed with water, the products are not $\ce{Na-}$ and $\ce{H3O+}$. The reaction yields $\ce{NaOH}$ and $\ce{H2}$ gas. Why does solid $\ce{NaH}$ not act as a Brønsted acid in ...
4
votes
1answer
33 views

Reversibility of an acid's reaction with water depending on its strength

This is how my chemistry professor compared reaction of a weak and a strong acid with water: $$\ce{HCl + H2O -> H3O+ + Cl- + Heat}$$ In this case $\ce{H2O}$ breaks the bond between $\ce{H}$ ...
1
vote
1answer
48 views

Unique Solubility Expression for Sulfide Salts

While looking at aqeuous $\ce{K_{sp}}$ values in the back of my textbook, I noticed that there is a asterisk by all of the sulfide compounds (such as $\ce{HgS}$), and the asterisk says, "For a ...
12
votes
3answers
402 views

Why stepwise dissociation for acids but not hydroxide bases?

My son asked this over the weekend and I didn't have a good answer: how come with polyprotic acids we assume that the release of each $\ce{H+}$ is progressively harder, but with bases like ...
0
votes
0answers
13 views

How to calculate the gas pressure of HCl over a saturated CuCl2 solution

I have a concentrated solution of $\ce{CuCl2}$ ($<200~\mathrm{ml}$, surface area $2100~\mathrm{cm^2}$). I saw a note about protecting metal equipment from $\ce{HCl}$ attack in the room ...
3
votes
1answer
198 views

How to identify a redox reaction?

I don't understand how to identify a redox reaction. The answer key shows the correct answer as D, but I'm confused as to why. Which balanced equation represents a redox reaction? $$A. ...
0
votes
0answers
27 views

What is the PKa of hexafluorosilicic acid?

I've tried Googling this for about an hour and couldn't find the information on any Chemistry resource sites. Given the formula F6H2Si, is it possible to calculate the PKa, or can this only be worked ...
4
votes
1answer
74 views

Sulfuric acid's effect on rocks

I am no chemist, nor did I pick up much understanding of chemical reactions in school. But I would like a basic understanding of how "reactive" and "potent" sulfuric acid is on rock; i.e., whether or ...
0
votes
1answer
14 views

Acidic strength of organic acids. Substituted PhCOOH acids

Could someone please explain the order of acidity of ortho, para and meta substituted benzoic acids with the substituent as methyl group? Methyl group operates +I and +R effect, I believe.
3
votes
0answers
37 views

Identifying a polyprotic acid using titration

I have the following question from a high school chemistry lab: If an unknown acid has more than one equivalence point, is there a reason to expect a specific $K_\mathrm{a}$ ($K_{\mathrm{a1}}$, ...
0
votes
1answer
48 views

If ionic compounds are strongly bonded, why are acids with a more polar central atom the stronger types of acids?

If the central atom is more polar, it pulls electron density away from the H+, making it more detachable. But why, then, are ionic compounds (which are even MORE polar than acidic covalent compounds) ...
3
votes
1answer
29 views

Why is sulfuric acid used in the Jones oxidation of alcohols?

When oxidising primary alcohols, $\ce{K2Cr2O7}$ is used because it's a useful & readily available oxidising agent. Why does the sulfuric acid need to be added? Does it have to do with the ...
1
vote
1answer
28 views

Is this chemical reaction correct?

First, $\ce{N2H4}$ is a base when it reacts with water, it accepts a proton. $$\ce{N2H4 + H2O -> N2H5+ + OH-}$$ Can I follow up the reaction with this? $$\ce{N2H5+ + H2O -> N2H6^{2+} + OH-}$$ ...
2
votes
2answers
38 views

Can I remove flesh from seeds with hydrochloric acid?

I have some crenellated seeds with which I make jewellery and I need to remove the remaining fruit flesh from them. I have tried lots of things including ammonia, vinegar, bleach and a ultrasonic ...
0
votes
1answer
31 views

Basicity of Acetic acid

Acetic acid is a monobasic acid as it disassociates into CH3COO$^-$ and H$^+$. Why don't the hydrogen atoms of CH3COO$^-$ disassociate too?
0
votes
1answer
39 views

Calculation of Ka and pH

$$\ce{H3PO4 <=> H+ + H2PO4-}$$ $$K_{\mathrm a1} = 7.4\times10^{-3}$$ $$\ce{H2PO4- <=> H+ + HPO4^2-}$$ $$K_{\mathrm a2} = 6.2\times10^{-5}$$ $$\ce{HPO4^2- <=> H^+ + ...
0
votes
0answers
25 views

will hydrofluorosilicic acid react with chlorine gas?

I am conducting a thought experiment in which I have to get rid of 700 million tons of chlorine gas every year. Will Chlorine ($\ce{Cl2}$) gas react with $\ce{(H3O)2[SiF6]}$? If so, under what ...
4
votes
1answer
58 views

Why is DBU the most popular base with an amidino group? Does the basic strength have something to do with the ring size being 7 for one of the rings?

Structure of DBU DBU is used as a very strong base(which is due to resonance stabilization of amidinium cation) with steric bulk. Is any other compound used instead? If not, why not?
1
vote
0answers
18 views

Why isn't an Acid-base titration curve linear? [duplicate]

Sorry if this is a stupid question, but why is a acid-base titration curve not linear? As you add more acid solution to a basic solution, shouldn't the pH of the basic solution slowly go up in ...
8
votes
1answer
146 views

Can H4O 2+ form?

Like $\ce{NH4+}$ ,Is there any possibility of formation of $\ce{H4O^{2+}}$ (of tetrahedral structure)? My theory is: it can be formed by osmosis setup where heavy acids like $\ce{H3PO4}$ or ...
1
vote
0answers
36 views

How do I open volumetric flask with with 1M HCl? [duplicate]

I have two volumetric flasks with ground glass stopper, and I have 1M HCl inside each of them. I can't open either, stopper is "glued" to the flask somehow. Potentially by hydrochloric acid. Or maybe ...
0
votes
0answers
22 views

Which substance participates readily in both acid-base and oxidation-reduction reactions?

Which substance participates readily in both acid-base and oxidation-reduction reactions? $\ce{Na2CO3}$ $\ce{KOH}$ $\ce{KMnO4}$ $\ce{H2C2O4}$ And why? I know $\ce{KOH}$ ...
0
votes
1answer
66 views

What is called a salt?

While I was doing experiments in my school days, they gave me different substances with the combination of base and acid radicals, for example ammonium nitrate and zinc chloride and they seldom called ...
0
votes
1answer
37 views

Making Ferric Chloride using HCl and Ferrum

I am not chemist: I live in the part of the world that you can't find many things, but I have HCl and bunch of nails. I there way to make ferric chloride from these things? If this doesn't work what ...
2
votes
0answers
30 views

Methyl anthranilate sulfuric acid - acid base reaction

When methyl anthranilate is added to sulfuric acid a white precipitate forms. I am assuming this is an insoluble salt produced in the acid base reaction, where the lone pair on the nitrogen will ...
0
votes
0answers
22 views

acidity order of squaric acid type compounds

what will be the order of the following compounds: according to me the answer should be: 2>1>3; here is my working: on deprotonating in 1.resonance does take place but in the end a negative ...