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
43 views

How to calculate the concentration of all relevant species in a buffer of a given pH?

You prepare $1.0~\mathrm{L}$ of a $0.25~\mathrm{M}$ acetic acid solution with a final $\ce{pH}$ of $6.0$. What are the molar concentrations of all relevant acetic acid species ($[\ce{HA}]$ and ...
4
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2answers
48 views

Is Saliva an acid or base?

I have a debate with some friends who believe that saliva is just basic, but with the enzymes which make them reactive with objects in our mouth, shouldn't it be an acid in this case?
2
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1answer
63 views

What is a strong base?

How come that some insoluble compounds in water, e.g. $\ce{Mg(OH)2}$, $\ce{Ca(OH)2}$, $\ce{Sr(OH)2}$ are considered strong bases? Are they even strong bases? How can I tell if a compound is a strong ...
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1answer
20 views

Find amount of Acid and Base required to make buffer

I am wondering if it is possible to know exact amount of acid and base that we can put in together to make a buffer. I want to make a 0.05M Extraction buffer using Disodium Hydrogen Phosphate and ...
2
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1answer
33 views

Polyprotic bases and acids

I just have a question on how do you do the polyprotic bases. Question: show how oxalate ion can be a polyprotic base: My answer -> $$\ce{OOCCOO ^{2-}+ HOH \rightarrow HOOCCOO^{-} + OH ^{-}}$$ ...
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2answers
40 views

Are all strong acids the same strength?

Since the six strong acids dissociate completely into their ions, and the reaction goes to completion, does this mean that acids such as $\ce{HI}$ and $\ce{HCl}$ have the same acidic strength? I know ...
0
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1answer
58 views

Dissociation of different compounds?

What would be the dissociation of Hydrosulfuric acid in the presence of water? I was thinking that Hydrosulfuric acid or $\ce{H2S}_{(aq)}$ would form $\ce{2 H+}$ and Sulfur ions. With this logic, I ...
10
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1answer
959 views

Why would 1kW power supplies fail around Nitric acid (HNO3) gas?

I experienced a situation where some electrical power supplies (rated over 1kW) were exposed to nitric acid ($\mathrm{HNO_3}$) fumes at roughly 9ppm for half a day; these power supplies intermittently ...
2
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1answer
51 views

Why can't alcohols turn blue litmus red?

I came across the fact that alcohols cannot turn blue litmus red. The fact confuses me as they are acidic and acids do turn blue litmus solution red. What prevents alcohols from turning blue litmus ...
2
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1answer
61 views

Hydrogen cyanide - a Lewis acid?

I am told that $\ce{HCN}$ is a Lewis acid. From what I understand a Lewis acid possesses (an) empty orbital that is accessible to attacking nucleophiles. Does $\ce{HCN}$ have any empty orbital(s)? ...
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0answers
31 views

why do we always titrate with a strong acid or strong base?

Isn't it possible that you could take some carboxylic acid(which is a weak acid) add some ammonia(which is a weak base) to it and get this: $\ce{R-COOH}+\ce{NH3} -> \ce{NH2-R-COOH}+\ce{H2}$ This ...
2
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1answer
60 views

How do the strong acids dissociate?

In writing net ionic equations involving strong acids, one needs to know how strong acids dissociate. For example, the dissociation of $\ce{H2SO4}$: \begin{align}\ce{ H2SO4 &-> 2H+ + ...
0
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1answer
38 views

ph & pOH - Autoionization of Water

So I was learning about pH and pOH and it made sense. I looked at strong, weak acids & bases and learned that they dissociate completely in water. So then I moved on to water and learned about the ...
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2answers
43 views

why do we consider CuO as a base?

According to Arrhenius acid/base theory, a base is a substance which when dissolved in water furnishes $\ce{OH-}$. But $\ce{CuO}$ is insoluble in water and does not produce $\ce{OH-}$, so why do we ...
5
votes
1answer
84 views

Why is the pKa (COOH) of alanine and glycine similar but the pKa (NH_3) different?

Alanine is heavier with a ($\ce{CH_3}$) than glycine which has an ($\ce{H}$). What makes them have different $pK_{a}(\ce{NH_3})(pKa: Aly=9.69 , Gly=9.60)$ but similar $pK_{a}(\ce{COOH})(pKa=2.34) $ ...
3
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1answer
99 views

Stability of Sulfides - backbonding?

A stability model premised on Lewis acid-base covalent bonding can be proposed to rationalize the stability shown by sulfides such as CuS and Ag2S. For instance, although the oxide anion is a ...
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2answers
400 views

Why doesn't HCl form when you dissolve NaCl in water?

Why doesn't HCl form when you dissolve NaCl in water? That is it. Why doesn't this happen. People say it dissolves but shouldn't the acid form.
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0answers
25 views

How to calculate the undissociated concentration level of acetic acid with given ph level and pka value? [duplicate]

$0.5%$% of Acetic Acid was used to set $\ce{pH} = x$. I am trying to find how to calculate and get the undissociated concentration level of acetic acid with $\ce{pH} = x$ and $\mathrm{p}K_a = y$. ...
0
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1answer
35 views

Lewis Acid Catalysts [closed]

I am studying for the International Chemistry Olympiad and some of questions involve synthesis of complicated organic compounds and i have no idea how to do them. The setting of the questions is ...
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1answer
34 views

Naming rules and acidity of Cl2CHCH2COOH

How do we name $\ce{Cl2CHCH2COOH}$ ? Is seeing branched chain our number 1 priority so we name it 1,1-dichloro-3-propanoic acid? also Which is more acidic $\ce{Cl2CHCOOH}$ or $\ce{Cl2CHCH2COOH}$ ...
2
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2answers
50 views

Reuse 20 litre plastic drums for drinking water?

Would you consider it safe to clean and reuse a 20 litre plastic drum that contained 36% Hydrochloric Acid for drinking water? If so how would you recommend cleaning it?
3
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1answer
48 views

Why do acids usually completely react with bases?

When a neutralisation reaction happens, for example, $ 100 \mathrm{mol.l}^{-1}$ of $\ce{HCl }$ with $\mathrm{100 mol.l}^{-1}$ $\ce{NH_3}$, why does all of the base and acid get converted to salt ? Why ...
2
votes
1answer
37 views

Why does the ionic product of water remain constant after addition of non-neutral solute?

In my textbook, it is given that the ionic product of water $K_w$ remains constant even when a non-neutral solute such as an acid is added to it. $$K_w=\ce{[H3+O][OH- ]}$$ When a strong acid is added ...
3
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1answer
37 views

Why is a trialkylamine a better leaving group, in nucleophilic reactions, than a Cl group?

Why is a trialkylamine a better leaving group, in nucleophilic reactions, than a $\ce{Cl}$ group? In the same vein, isn't a trialkylammonium a much weaker acid than $\ce{HCl}$? $\ce{R-NR3+ -> ...
3
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2answers
66 views

Acidity of oxonium ion

How was the pKa value (-1.7) for the oxonium ion determined? Why does it correspond to the minimum pH value accessible in water? What reaction does it represent?
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1answer
33 views

Comparing Basic strengths of different species

Well I was doing questions on organic chemistry.I came across tonnes of questions where I was required to compare basic and acidic strengths. Comparing acidic strengths is fine - I remove an ...
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votes
2answers
36 views

Why should the product of the normality of the acid or base and its volume be constant?

$$\ce{N1V1 = N2V2}$$ where, N is the Normality of the Acid / Base & V is the volume in litres. We ask you to give a scientific justification or derivation to the above equation i.e. Why must ...
3
votes
2answers
106 views

Alternative PCB etching solutions - Is KMnO4 or NaCLO suitable oxidizer?

I need to etch small PCB for my project, since I do this once in a blue moon I would like to try some easy approach, preferably with household items. I'm aiming at the use of acetic acid with hydrogen ...
1
vote
2answers
90 views

Which of the following is the strongest base?

Which of the following is the strongest base? The options are a) $\ce{LiOH}$ b) $\ce{CH3Li}$ c) $\ce{LiNH2}$ d) $\ce{LiF}$ According to me the answer should be $\ce{LiF}$ as it has max no. of ...
0
votes
1answer
51 views

How is the dissolution of acetic acid that makes its aqueous solution a poor electrolyte?

I'm having a difficulty understanding the following quote from Wikipedia - Dissociation: Acetic acid is extremely soluble in water, but most of the compound dissolves into molecules, rendering it ...
0
votes
1answer
54 views

How to explain the increase in current with the increase in the concentration of responsible ions?

I have conducted an experiment wherein I have used different concentrations of $\ce{H2SO4}$, $\ce{HNO3}$ and $\ce{H3PO4}$ as the electrolytes. I filled the acid in glass tube and used a 9V battery, ...
9
votes
2answers
141 views

Does hydrogen bonding strength correspond to Bronsted basicity in a given medium?

It does seem that there is a correlation. Both are measures of proton affinity. Heck, isn't hydrogen bonding present in the transition states of most acid base reactions (excluding those involving ...
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votes
2answers
75 views

Hydrogen peroxide from water

Is it possible that $\ce{2 OH-}$ from water could react to form $\ce{H2O2}$? I mean most autoionization forms $\ce{H3O+}$ and $\ce{OH-}$. However I think it is possible that $\ce{H-}$ and $\ce{OH+}$ ...
2
votes
2answers
61 views

Why is the iodide anion a good nucleophile but a poor base?

The $pK_{aH}$ of $I^-$ is very low which indicated that it is not favourable for it to bond with a proton. However, why would it be likely to bond with any other atom (mostly carbon when considering ...
1
vote
1answer
37 views

Na2CO3 and HNO3 titration

As the title says, I am trying to find the pH of the followng problem (ANs: pH=10.77) Calculate the pH of a 100 mL solution containing 40.0 g of $\ce{Na2CO3}$ after 400 mL of ...
0
votes
1answer
90 views

What is the pH of a sodium hydroxide and hydrochloric acid mixture? [closed]

A solution is created by measuring $3.90 \cdot 10^{-5}~\mathrm{mol}$ of $\ce{NaOH}$ and $5.85 \cdot 10^{-4}~\mathrm{mol}$ of $\ce{HCl}$ into a container and then water is added until the final volume ...
2
votes
2answers
55 views

Why is Al³⁺ considered a hard acid if it forms covalently bonded compounds like aluminium oxide?

If something is a hard acid, it tends to form ionic bonds as it is polarizing. So why is the aluminium ion a hard acid when it forms bonds with covalent character. A similar argument follows for why ...
0
votes
2answers
53 views

How is it possible to account for the fact that NH3 is a weak base in water but a strong base in HCl? [closed]

I understand that the solvents differ in their acidity but why does this affect the basicity of the solute?
5
votes
1answer
53 views

How is it possible to quantify the strength of a Lewis acid/base?

When the $pK_a$ scale is not applicable - when there is no proton/charged species transfer - what should be used to quantify the strength of an acid?
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0answers
9 views

What distinguishes a Lewis Complex from an Adduct or are they synonymous?

I cannot think of a distinction - the terms seem to be used interchangeably when talking about products of Lewis acid-base reactions. However, I am concerned that I may have overlooked a subtlety. ...
2
votes
1answer
32 views

Finding pH of tri-protic acid

I am studying for my final and I am given this problem: A solution of sodium phosphate is made from 10.5 g sodium phosphate in 150 mL of water. What is the pH of this solution Given: Ka1, Ka2. ...
5
votes
2answers
79 views

If the hydroxide ion is such a poor leaving group then why does water dissociate?

Water dissociates into the hydroxide and hydronium ions but, why does this happen if the hydroxide ion is such a poor leaving group. Alcohols don't undergo $\ce{S_{N}1}$ reactions because the ...
0
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1answer
45 views

Why doesn't nitric acid have a positive charge?

From the diagrams I've seen $\ce{HNO3}$ has a dative covalent bond so why doesn't it have a positive charge?
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1answer
19 views

Common ion effect and acids

If I have 0.01M $\ce{HBr}$ in 0.09M $\ce{KBr}$, why would the presence of $\ce{Br-}$ ions from the $\ce{KBr}$ not reduce $\ce{HBr}$'s dissociation based on Le Chatelier's principle? Or would it?
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1answer
21 views

Acetic acid or ethanoic acid

Recently, my teacher likes to use household material to do an experiment. Today, we did an experiment on the reaction between vinegar and eggshell. When we were doing the analyzation of the ...
0
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1answer
36 views

What is the Chemistry behind “good” and “bad” cholesterol & their relation to Cis/Trans fatty acids?

I have searched Google for this but cannot seem to find an explanation. My question is as follows - what is the Chemistry/Biochemistry behind cis and trans fatty acids resulting in "Bad" LDL and ...
3
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2answers
98 views

why is benzoic acid stronger acid than 3-aminobenzoic acid?

why is m-aminobenzoic acid weaker acid than benzoic acid? obviously at m-position only -I effect will be shown but how doeas that make it a weaker acid than benzoic acid??
4
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1answer
58 views

How to Determine Acid Strength?

The correct answer is E, but I do not understand why :( Shouldn't (v) have the lowest pKa since it does not have a carboxyl group making it a strong acid? How do we determine the strength of acids?
14
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2answers
1k views

Why formulate drugs as HCl salts when HCl is in stomach acid?

I know there are issues of formulation and industrial processing that make it advantageous to produce many amine containing drugs as their salts rather than as freebases. And if giving the drug ...
2
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1answer
96 views

What's the strongest known organic acid?

What's the strongest known organic acid? Is it maybe trifluoromethanesulfonic acid or tautomer of pentacyanocyclopentadien?