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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Find the color of the solution

The acid-base indicator methyl red has a $K_{a}$ = $1 \times 10^{-5}$. Its acidic form is red while its alkaline form is yellow. If methyl red is added in a colorless solution with a $pH = 7$, the ...
2
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3answers
28 views

What does the hydrolysis of a salt tell us about its basic/acidic character?

I'm curious to know how basicity and acidity arises when a salt or covalent compound is dissolved in water.
2
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1answer
54 views

Confused on Amphiprotic vs Polyprotic

I have several questions relating to amphiprotic vs polyprotic substances. First, I have read that $\ce{H2AsO4-}$ is a amphiprotic substances in that the dominant reactivity is $$\ce{2H2AsO4- ...
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1answer
53 views

How could household vinegar create a salt on car carpet?

I am not a chemist! My chemistry classes from my molecular biology undergrad are far behind me. But I think I created a salt, and I don't know how. Here is my mystery: I recently got some water in my ...
2
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1answer
67 views

Neutralization reaction

Question) Complete and balance each of the following molecular equations (in aqueous solution); include phase labels. Then, for each, write the net ionic equation. (A) $\ce{NH_3 + HNO_3 ->}$ My ...
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289 views

How much can the pH change through dilution?

Consider an acidic solution with Hydrogen ion concentration, $\ce{[H+]}$ of $10^{-5}\:\mathrm{M}$. Since $\:\mathrm{pH} = -\log \ce{[H+]}$ the $\:\mathrm{pH}$ of solution is $5$. Suppose we dilute ...
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2answers
42 views

Calculate the pH of acetic acid for a 0.02 M solution

We have a solution $\ce{CH3COOH}$ (acetic acid) with $c=0.02~\mathrm{mol/L}$ and the of acetic acid, $K_A = 1.8\cdot10^{-5}$. Calculate the $\mathrm{pH}$ of this solution. I tried everything ...
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2answers
36 views

Why is $\ce{HSO4-}$ shown as an example of a weak acid instead of $\ce{HSO4}$?

I'm watching some (really awesome) chemistry courses, and I think I have a fairly decent handle on acids and bases (or maybe not, and I'm fooling myself). But the teacher just showed a table of ...
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1answer
39 views

Any possible additives to a drain cleaner I use as a source of NaOH?

It is in pellets. And the box says main ingredient $\ce{NaOH}$ at least $30\%$ (I hope it's more). The box also says "aluminium catalyst". My goal was to take these pellets and dissolve them in water ...
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0answers
33 views

Neutralisation of HCl with NaOH - generated heat and excess concentration [closed]

If you have $75\:\mathrm{mL}$ of $M(\ce{HCl}) = 4\:\mathrm{M}$ at $25\:\mathrm{^\circ C}$ and $100\:\mathrm{mL}$ of $M(\ce{NaOH})=5\:\mathrm{M}$ at $27\:\mathrm{^\circ C}$ with a final temperature ...
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1answer
23 views

How to create a buffer solution from NaOH and $\ce{CH3COOH}$?

In my chemistry book, they say that an approach to making a buffer solution of pH$=5.09$ is by adding an appropriate amount of strong base($0.052$ mol $\ce{NaOH}$) to $0.300L$ of $0.025 M$ ...
2
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1answer
35 views

Formation Constants; Lewis Acidity

I still distinctly remember reading about how Lewis acidity/basicity was characterized using kinetics. The reason given was that because formation constants are so large, these reactions are not ...
2
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1answer
64 views

Conversion of CO2 to methane

Suppose one could generate an enzyme with arbitrary conditions at the active site. What conditions would then be necessary to cause carbon from dissolved $\ce{CO2}$ in low $pH$ water to combine with ...
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2answers
242 views

The Acidity of Boric Acid

The “real way” boric acid behaves as an acid in water is first by acting as a Lewis acid (bottom reaction, in black). In fairness to the undergrads, I’d bet >25% of graduate students around the ...
4
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1answer
33 views

Differentiating between Titration, Buffer, diluted buffer, Deionized H₂O

I had a chemistry lab where we had to titrate three solutions with HCl, a buffer, a diluted buffer and deionized water. My partner and I didn't label the charts we made, so now I have to figure out ...
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2answers
95 views

Does H3O+ donate a H+ to Water?

Does the hydronium ion donate a proton to water? If the collision of 2 molecules of water can cause a proton to be transferred, does hydronium 'pass' a proton to water?
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2answers
39 views

Reconciling the units of pH calculation

As part of a simulation I am developing I have an acid in aqueous solution represented as a concentration field of mass density (units g/L) at various points in ...
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0answers
23 views

ice cream float - what causes it? [duplicate]

When you mix ice cream and a soft drink (like coke,) a reaction happens that creates a thick foam. I am assuming the foam id composed of carbon dioxide gas and milk curd, which is produced by the ...
1
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1answer
26 views

Which acids are created by the combination of a gas and water?

Which acids are created by the combination of a gas and water? I know that carbonic acid is created by combining carbon dioxide and water, but are there others? Is there a specific name for this ...
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1answer
30 views

Nitrogen Tetrafluoride, acid or base?

$\ce{NF4+}$ ion reacts with water as: $\ce{NF4+ + H2O -> NF3 + H2F+ + {1/2}O2}$. My question is, does $\ce{NF4+}$ serve as an acid or base in this reaction, and why? Thanks.
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1answer
28 views

pka explanation through empirical formula?

Suppose two compounds with, say, pka(1)=2.8 and pka(2)=3.2, and formulae $C_aH_bO_c=C_pO_q(OH)_r$ and $C_dH_eO_f=C_uO_v(OH)_w$, respectively, with given abcdef, pqruvw. Can we explain the above pka ...
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3answers
59 views

Why does an acid exist when dissolved in water?

Acid is a substance that releases $\ce{H+}$ ions when mixed with water But if it releases $\ce{H+}$ ions the acid will ultimately not exist. For e.g we take the acid $\ce{H2SO4}$. If we add water ...
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1answer
194 views

Why is Aluminium Chloride a Lewis Acid if it's an ionic compound?

In my textbook it says in the reaction $\ce{AlCl3 + Cl- -> AlCl4-}$, Aluminium Chloride ($\ce{AlCl3}$) has six valence electrons and accepts a lone pair from $\ce{Cl-}$, but wouldn't that mean the ...
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3answers
49 views

Which alpha Hydrogens are more acidic?

Why is the alpha hydrogen of a acetoacetic ester less acidic than the alpha hydrogen of 1,3 diketone ? I was under the impression that acetoacetic ester has more resonance structures so it more ...
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0answers
28 views

How to determine amount of CO₂ in soda water

I've got a problem in determining the amount of $\ce{CO2}$ in soda water. Basically, I have boiled some purified water to remove the dissolved gas. By using a SodaStream machine, I made carbonated ...
2
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3answers
390 views

Hydrochloric vs sulfuric acids, which are stronger acids?

Of my belief, sulfuric acid might be a little stronger than Hydrochloric acids. Because even though they both are strong acids, one mole of sulfuric acid produces two times as much hydro ions as one ...
0
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1answer
37 views

Which is more acidic? CO or CO2?

Q1)Which of the given compounds is most acidic? $\ce{CO}$ or $\ce{CO2}$ ? How to solve(explanation)? EDIT: Q2) $\ce{BeO}$ is amphoteric while $\ce{B2O3}$ is acidic - True/False?
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1answer
60 views

Separation of Binary mixture?

I will be given a binary mixture containing two unknown compounds(the mixture could be either liquid or solid- I don't know yet). The plan of the experiment is to identify the two compounds. So my ...
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1answer
59 views

Homoassociation and Acid Strength

I understand that the strength of HF differs significantly depending on the concentration. I understand the basic theory behind this - homoassociation - and stabilization of the highly negative charge ...
1
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1answer
68 views

What happens as an acid is mixed with Sodium Chlorite

I'm told that when Sodium Clorite $\ce{(NaClO2)}$ is mixed with an acid (in a water solution) it produces Chlorine Dioxide ($\ce{ClO2}$) which remains (mostly or partly) dissolved in water. I would ...
3
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1answer
34 views

How to calculate the pH of a buffered solution with Henderson Hasselbalch?

Lets say you have a buffered solution containing $0.50~\mathrm{M}$ acetic acid ($K_a = 1.8 \cdot 10^{-5}$) and $0.50~\mathrm{M}$ sodium acetate, and you want to calculate the $\mathrm{p}\ce{H}$ of ...
0
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2answers
75 views

Lewis base strength and the hydrogen proton

My prof told me that we can compare Lewis base strength based on electron donation to the H+ proton - i.e sigma bond formation with the H+ proton - and proceeded to conclude that $\ce{S^{2-}}$ is a ...
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1answer
42 views

Rationalizing Strength of Binary Halogen Acids with MO Theory

Help me walk through the logic here: 1) HF is a weaker acid than HCl. 2) This is as far as I can understand. How does sigma star affect the acidities of the binary halogen acids? If a ...
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0answers
25 views

In a redox reaction, why does more than one oxidation state of an element form?

Consider the reaction 100ml 10M $\ce{NaOH_{(aq)}} +$ 100ml 10M $\ce{NaHSO3_{(aq)} +}$ 100mL 0.01M $\ce{KMnO4_{(aq)}}$ In the picture posted here, the left columns give information on the Molarity of ...
2
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1answer
129 views

Why is it that neither silver nor copper react with a strong acid?

$\ce{Fe}$, $\ce{Mg}$, $\ce{Ni}$, $\ce{Pb}$, $\ce{Sn}$, and $\ce{Zn}$ all react when they (in solid form) are submerged in an acid solution with the presence of a strong acid like $\ce{HCl}$, but ...
4
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1answer
125 views

Hydrogen halide acidity

Why is it that $pK_{\ce{a-HF}} \lt pK_{\ce{a-HCl}}\lt pK_{\ce{a-HBr}}\lt pK_{\ce{a-HI}}$, although the electronegativity decreases? The more electronegative the atom accompanying hydrogen, the lower ...
0
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2answers
75 views

NCl₃ + H₂O → NH₃ + HOCl , the resulting solution is acidic, basic or neutral?

When $\ce{NCl3}$ is dissolved in water, $\ce{NH3}$ and $\ce{HOCl}$ is formed. Can you please explain me whether formed solution is acid or basic or neutral? thank you!
0
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1answer
30 views

Activation Energy in Acid/Base reactions

For simple acid/base reactions - i.e. those involving inorganic compounds - does activation energy ever play in reactions? Or can we ignore kinetics entirely and just consider thermodynamic factors ...
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2answers
91 views

Protonation of Guanidine

Why is the $\ce{sp^2}$ hybridized nitrogen atom in guanidine the most basic? I know that as a general guideline, $\ce{sp^3}$ hybridized atoms are more basic than $\ce{sp^2}$. Bases are electron ...
4
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2answers
187 views

Do buffers only work for species of the opposite variety? (I.e. weak acids buffer strong bases and vice versa)

I have looked at several sources including Khan Academy, ChemCollective and the answer to a similar question: Can someone please explain buffers to me? However, it is not clear whether buffers can ...
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0answers
6 views

Concentration of derived species as a function of initial molarity

Is there a function that can relate the concentration of the dissociation products or derived species from an acid/base reaction to initial molarity? I know that ionization extent tends to increase ...
0
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1answer
47 views

Hydrolysis of salt

The hydrolysis of salt tells you whether a salt is acidic or basic. But it does not tell you how acidic or basic a salt is. Is a way to determine this. My guess is that taking of the weak base part ...
3
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1answer
39 views

Since aqueous acids release Hydrogen cations into the solution, will an electric current create Hydrogen gas?

I was wondering that since acids dissociate in water to make a lot of $\ce{H+}$ cations. Is it possible that introducing a supply of electrons via an electric current, would create $\ce{H2}$ gas?
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1answer
70 views

Acidic and Basic character

Which is acid salt of which the aqueous solution is basic? $\ce{NaHSO4}$ $\ce{Na2SO4}$ $\ce{NaHCO3}$ $\ce{Na2CO3}$ $\ce{Mg(OH)2}$ $\ce{MgCl(OH)}$ And Why?
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3answers
67 views

Why is a buffer solution most effective when concentrations of salt and acid are the same?

Why does a buffer work most effectively when the concentration of salt and acid is 1:1?
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1answer
40 views

Esterification and dehydration synthesis

I know there are many more terms out there like polymerization, condensation, etc. But the important thing is whether they can be differentiated or not. In Esterification, which I just learned, needs ...
5
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2answers
167 views

Calculating the pH of a dilluted aqueous KOH solution

I am not a chemist at all, but I wanted to help someone to get to the solution for the task of calculating the $\mathrm{p}\ce{H}$ of an aqueous solution of $0.01\:\mathrm{nM}~\ce{KOH}$ in water. ...
0
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2answers
53 views

Amine Inversion

I could not find this anywhere on the net. I am asking what is amine inversion and how does it affect basicity? For instance why is $\ce{Et3N}$ less basic than cyclohexyl-amine despite the $+I$ from ...
1
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3answers
57 views

Inductive effect

In my teacher's power-point states that we must consider that inductive effect in $CH_{3}COOH$ exists because of the electron deficiency in $C$ (partial positive charge $\delta^{+}$) as a result of ...
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0answers
53 views

Lewis Acidity and Bacteria

How does Lewis acidity correlate with bactericidal activity? I read on Wikipedia that the two are positively correlated but no explanation was given. Does it have to do with the movement of ...