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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10 views

Weak acid and salt containing conjugate base forms acidic buffer?

I read this today: If you mix equal amounts of $1 M$ $H_3PO_4$ and $1 M$ $NaH_2PO_4$ you get a buffer at $pH<6$. The reason given is that a weak acid plus a salt containing the conjugate base ...
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2answers
16 views

what is the range of strong acid and base in pH scale

what is the range of strong acid and base in pH scale.I have much confusion.
3
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1answer
21 views

When will organometallics act as base or nucleophile?

I would like to ask if the hydrogen next to carbonyl group is acidic,and organometallics are strong base, when will it act as a base and extracts the acidic proton and when will it attack the carbonyl ...
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4answers
57 views

What prevents weak acids from dissociating completely? [on hold]

What prevents weak acids from dissociating completely in water?
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0answers
34 views

What is the cause behind ortho-effect? [duplicate]

Why are ortho-nitrobenzoic acid and ortho-hydroxyphenol more acidic than their para and meta counterparts? Reasons scattered over internet say the conjugate base gets stabilised by intra-molecular ...
1
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1answer
37 views

Why is acetylsalicylic acid still more acid than benzoic acid?

In this question, it is explained why salicylic acid is a stronger acid than benzoic acid. So, why acetylsalicylic acid (aspirin), whose conjugate base cannot hydrogen bond since there is no hydrogen, ...
1
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1answer
53 views

What happens when a soft drink containing citric acid is opened? [on hold]

Citric acid is one component of some soft drinks. Suppose that a $2~\mathrm{L}$ solution is made from $150~\mathrm{mg}$ of citric acid, $\ce{C6H8O7}$. What products are produced when ...
3
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1answer
31 views

Can acid mine drainage form acid rain?

Can acid mine drainage form acid rain? Since normal acid rain is formed via combustion of fossil fuels, the sulphur dioxide and nitrogen dioxide are all in the gas phase, whereas in acid mines the ...
1
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1answer
38 views

How to calculate the pH of a buffer after dilution

You have a beaker containing 542 mL of a solution of 0.48M acetate buffer (pKa = 4.76) at pH 4.2. To this solution, you add 342 mL of pure water. What is the pH of the resulting solution? The ...
2
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0answers
23 views

How are Pauling's rules applied to Nitric acid?

The lewis structure of nitric acid is: So, since Pauling's rule is $pK_a=8-5p$, where p is the number of oxo groups, how is the rule applied in this instance? $p=1.5$? $p=2$?
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0answers
17 views

How to calculate the volume of sulfuric acid that contains a specific mass, neutralises sodium hydroxide or reacts with sodium carbonate? [closed]

What volume of $0.1~\mathrm{M}$ sulphuric acid Contains $4.9~\mathrm{g}$ of sulphuric acid Neutralises $25~\mathrm{cm^3}$ of $0.2~\mathrm{M}$ sodium hydroxide solution Reacts exactly with ...
3
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1answer
41 views

Buffer calculation

Problem: A buffer was made by mixing 500 mL of 1 M (mol/L) acetic acid and 500 mL of 0.5 M calcium acetate. What are the resulting concentrations of acetic acid (henceforth called ...
7
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1answer
81 views

Mechanism for acid-catalyzed dehydration of 2,3-dimethylcyclopentanol

How do you get from 2,3-dimethylcyclopentanol to 1,2-dimethylcyclopent-1-ene? I know the -OH group leaves as water (being protonated by acid) forming a carbocation. Then the weak nucleophile (water) ...
1
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1answer
24 views

How do you determine whether or not a acid will be destroyed upon the addition dilute bases and acids?

So I have a liter of buffer consisting of .1 M $\ce{HF}$ and 0.05 M $\ce{NaF}$. I'm given three solutions to determine what would essentially destroy the buffer: (a) 0.050 mol of $\ce{HCl}$ (b) ...
10
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1answer
152 views

Experimental verification of the field effect

March's Advanced Organic Chemistry has the following paragraph - The other effect operates not through bonds, but directly through space or solvent molecules, and is called the field effect. ...
3
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2answers
61 views

Diluting acetic acid to obtain a solution of pH 5 [closed]

What percent of a solution needs to be acetic acid for a particular $\mathrm{pH}$? I have 100% acetic acid, and want $1~\mathrm{L}$ of solution with a $\mathrm{pH}$ of 5. I've done some research, but ...
1
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2answers
75 views

Equilibrium constants for lewis acids such as Ca2+

I need to calculate the theoretical $\mathrm{pH}$ in a $50~\mathrm{mL}$ water solution where $6.4\times10^{-4}~\mathrm{g}$ of $\ce{Ca^{2+}}$ is present. The reaction I base this on is the following ...
2
votes
1answer
44 views

Buffer solution calculation

Preface: Buffer solution (acid-base buffer). I am provided with a weak base, which I will designate B. pKa for B's conjugate acid--which I will designate BH--is 8.1, and its mole weight (sic) is ...
2
votes
1answer
45 views

Why does an acid salt possess acidity as well as basicity?

For example, $\ce{BaHPO_{4}}$ has acidity of 2 and basicity 1. Why does this so? Its basicity is 1 because it has 1 replaceable hydrogen ion. But why does this have acidity?
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1answer
72 views

What is the logical explaination for benzoic acid being stronger than carbonic acid? [duplicate]

What is the logical explanation for benzoic acid being stronger than carbonic acid? This link says that $K_\text{a}$ of benzoic acid is greater than carbonic acid. But why so? I want an explanation ...
2
votes
1answer
32 views

Titrating and the addition of acidic distilled water

I have read numerous online questions similar to the one I am about to ask. But for most of them the answer has been that the reason one can add water to the unknown concentration solution during a ...
0
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1answer
25 views

How to write equations for reaction metals with water

Please write two equations for reacting lithium with water and barium with water. Make sure to add the states of matter after each compound. Currently, for lithium I have the equation ...
2
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1answer
34 views

Why does solvent leveling occur?

Solvent leveling means that strong acids completely dissociate in that solvent so it is impossible to distinguish between two acids that completely dissociate in it. A solvent levels and acid if the ...
2
votes
1answer
57 views

Finding pH of a buffer

What is the pH of a solution prepared by mixing 25.00 mL of 0.10 M methylamine, $\ce{CH3NH2}$, with 25.00 mL of 0.10 M methylammonium chloride, $\ce{CH3NH3Cl}$? Assume that the volume of the solutions ...
2
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0answers
46 views

Is 1.5M NaOH a strong enough base to deprotonate benzyl alcohol?

Is 1.5M NaOH a strong enough base to deprotonate benzyl alcohol? I realize that NaOH generally does not deprotonate benzyl alcohol, but we performed an extraction in a Fischer esterification lab with ...
4
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3answers
66 views

Determining the H⁺ Concentration of Na₃PO₄

The problem asks to determine the $[\ce{H+}]$ in a $0.20~\mathrm{M}$ solution of $\ce{Na3PO4}$. The $K_\mathrm{a}$ of $\ce{HPO4-}$ was given as $4.5\times 10^{-13}$, which then allows one to calculate ...
1
vote
1answer
50 views

Understanding a particular passage in a chemistry textbook

In the textbook passage that is seen in the picture, I am having trouble understanding the third last sentence in the paragraph that starts with "2." The statement reads: "It cannot; any solution ...
1
vote
1answer
28 views

After mixing, which species has the dominant affect on the pH of the solution that remains?

A solution is created by mixing 250 mL of 1 M $\ce{HCl}$, 250 mL of 1 M $\ce{CH3COOH}$ and 500 mL of 1.5 M $\ce{CsOH}$. The $K_\text{a}(\ce{CH3COOH}) = 1.8 \times 10^{-5}$ What is the pH of this ...
4
votes
1answer
130 views

Why should 2,6-Dimethyl-4-nitrophenol be more acidic than 3,5-Dimethyl-4-nitrophenol

I was trying to compare acidity of some organic compounds but can't understand some: Why should 2,6-dimethyl-4-nitrophenol be more acidic than 3,5-dimethyl-4-nitrophenol? I have been trying to ...
2
votes
1answer
55 views

I need to find the Ka of a weak acid in titration with a strong base

I have been working on this lab forever and have not been able to get a $K_\text{a}$ anywhere close to the accepted value. I’m sure I’m missing something really simple. We titrated $\ce{CH3COOH}$ ...
4
votes
4answers
266 views

What is the pH of a 5M solution of HCl?

So in order to solve this, apparently all you need to do is plug it into the equation $$\mathrm{pH} = -\log[\ce{H3O+}]$$ where the concentration of $\ce{H3O+}$ is 5M. But why can we assume this? ...
3
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1answer
53 views

What is the pH of CsBr?

a) 3.8 b) 7 c) 9 d) 12 My Attempt: $\ce{Cs+ + H2O <<=> CsOH + H+}$ (because $\ce{CsOH}$ is a strong base, the forward reaction should not occur right)? $\ce{Br- + H2O <<=> HBr + ...
6
votes
1answer
76 views

Why/how do cloves break down plastic?

When my family buys powdered cloves in bulk, we put them in plastic until we get home - which takes at very most an hour. As soon as we get home, we transfer them into glass because we have had issues ...
4
votes
2answers
37 views

How does one determine the relative basicity of a nitrogen in a molecule?

I'm trying to solve this problem: Specifically, how does one know which nitrogen is more basic? I'm assuming that for the first molecule, that it's the nitrogen without the proton, since it seems ...
1
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0answers
19 views

Why leveling effect is reduced when strong acid is dissolved in a weaker acid than water?

I am reading a book that basically states what is the title. This is something I observed when I was doing ICE: when acid and base neutralize, we always assume complete neutralization. ...
2
votes
0answers
40 views

What's the relationship between charge and acidity/basicity?

I understand the acidity of a substance increases with electronegativity and size (valence shell space) of an atom (periodic trend) that contains a hydrogen atom (Bronsted-Lowry). However when looking ...
2
votes
1answer
31 views

History of acid-base reactions

Basic and acidic materials exist in nature, so it makes sense that our forefathers could know what happens when they react. I would like to know when and how did they learn about this. In particular: ...
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votes
1answer
50 views

How to find pKa given absorbances and pH [closed]

If the absorbance of one of the buffer solutions (pH = 4.623) was 0.319 and the absorbance of the basic solution was 0.625, what is the $\mathrm{p}K_\mathrm{a}$ of the indicator? Include activity ...
2
votes
3answers
76 views

pKaH of pyridine versus other imines

Why is pyridine so much more acidic than other similar imines (5.5 versus ~9, see picture)? Wouldn't delocalization of the positive charge into the aromatic system stabilize it and hence decrease ...
0
votes
1answer
48 views

Effect of dilution on pH for HCl

Is it necessary to consider common ion effect when suppose a strong acid like HCl is added to water? For example in this question: 10 mL of $10^{-6 } \ce{mol/L \ HCl}$ solution is mixed with 90 mL of ...
1
vote
1answer
35 views

What is degree of dissociation for polyprotic acids?

My textbook says that degree of dissociation= [HA]dissociated/[HA]initial * 100%. However, it also says that citric acid has a greater degree of dissociation than acetic acid because citric is ...
2
votes
1answer
38 views

Finding is the concentration of H⁺ in a benzoate buffer solution after adding HCl

Q: A buffer with a pH of 4.44 contains 0.21 M of sodium benzoate and 0.12 M of benzoic acid. What is the concentration of $\ce{[H^+]}$ in the solution after the addition of 0.050 mol of $\ce{HCl}$ to ...
2
votes
1answer
45 views

What is the reason for strong acids/bases dissociating in water?

I have read that the actual definition of a strong acid is one which will fully dissociate in water, so please do not turn the problem on its head when answering. It is also my understanding that ...
1
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1answer
27 views

Order of lewis basic strength

My teacher told me that order of lewis basic strength is inversely proportional to electro negativity. Comparing between iodide ion and chloride ion, chloride ion is more electronegative than iodide ...
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1answer
23 views

Is Bromide anion acting as a base in reaction with ethylamine and methylbromide?

What is happening in Step 2 and would you please give the reaction mechanism for it as well?
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1answer
45 views

Is an acid a liquid or an aqueous solution? [closed]

I am tying to determine if an acid is a liquid or aqueous solution? Please can some one enlighten me?
2
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1answer
29 views

How is charge density a useful measure of polarising power and polarisability?

How do you use charge density (Z/r) as a measurement of polarizing power and polarisability and hence hard soft acid character. So far I've been looking at different polarizing power and ...
4
votes
1answer
77 views

Calculating pH for titration of weak base with strong acid

Calculate the pH at the equivalence point for the titration of 0.130 M methylamine ($\ce{CH3NH2}$) with 0.130 M $\ce{HCl}$. The Kb of methylamine is ${5.0×10^{–4}}$. So I started with the equation: ...
0
votes
0answers
22 views

Strong and weak bases? [duplicate]

I have read that a strong base fully dissociates in aqueous solution to form hydroxide ions, and therefore that strong bases are alkalis. I was wondering if you can have a strong base that is not an ...
0
votes
2answers
32 views

Confused about strong/weak dibasic and tribasic acids?

I know that sulfuric acid is considered a strong acid, and the dissociation of its first H+ ion is complete and of its second H+ ion is partial. Phosphoric acid is weak and all three of its H+ ions ...