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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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2k views

Is Sodium Hydroxide a Bronsted-Lowry Base?

I know that sodium hydroxide dissociates into sodium cation and hydroxide, so it must be an Arrhenius base. I am also aware of the rule that all Arrhenius acids and bases are considered to be Brønsted-...
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1answer
110 views

Why can't negative charge on a carbon have resonance with a neighboring alcohol?

In these resonance forms of a conjugate base of ascorbic acid, why can't the electrons on the negatively charged carbon in the third form be used to form a double bond with the alcohol and thus ...
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1answer
62 views

Calculation of composition of drain cleaner

Important note: I'm an eighth-grader. I taught myself chemistry to organic chem using an arsenal of textbooks*, but I have gotten things wrong, namely resonance. Please read above (also this if you ...
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2answers
990 views

Lab Methods for Determination of Phosphoric Acid Concentration

Dear stack exchange, For my next lab session we have been tasked to come up with two different methods for determining the concentration of an unknown sample of phosphoric acid. Design at least ...
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1answer
1k views

pH value change with dilution

How does pH value change with dilution for the question shown in the picture? I expect the pH value to increase with dilution. Is there any case where the value remains same with dilution?
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1answer
246 views

Why must NaOH be in excess if we wish to measure the effect acid strength has on the enthalpy of neutralisation?

A few different acids are given i.e $\ce{HCl}$ , ethanoic acid, $\ce{H2SO4}$, ethanedioic acid. We want to conduct an experiment in which we measure the temperature rise for neutralisation as a ...
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1answer
502 views

How to make a buffer using HClO

If we plan to prepare a buffer with the $\mathrm{pH}$ of $7.35$ using $\ce{HClO}$ ($\mathrm pK_\mathrm a = 7.54$), what mass of the solid sodium salt of the conjugate base is needed to make this ...
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2answers
1k views

Relating pH and buffer capacity

So, here is the equation for a weak acid - strong base pH curve And here is the expression gotten when the derivative of concentration of hydronium ions with respect to volume of base added is ...
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1answer
802 views

HDPE bottle for gasoline?

What are the risks of storing E10 gasoline in a gallon HDPE container for a few months, vs storing in a proper plastic fuel can? Assuming the HDPE gallon is thick (used for Hydrochloric acid before, ...
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1answer
29 views

Disappear alpha, concentrations [closed]

I have a doubt that torments me constantly ... And I hope your answer so that you can solve it. When they give me $K_{a}$ or $K_{b}$, the concentrations and they ask me to find alpha, when can I ...
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1answer
180 views

Why is the strong acid written in a net ionic equation? [closed]

Strong acids dissolve and break apart into ions, so in a net ionic equation, why are they written?
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1answer
430 views

How pH paper works [duplicate]

Please tell me how a pH paper works. How does it decide whether the solution is an acid or a base on the basis of ions formed and how it can determine its concentration. How does it indicate an acid ...
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1answer
7k views

Basicity of heterocyclic compounds

Pyrrol, furan or thiophene don't have any bond pair electrons free to release which is why they shouldn't be basic, but the lecturer of organic chemistry is saying that they are basic as they react ...
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1answer
3k views

Why does bisulfite (HSO3-) act as a base in this reaction?

I don't understand why the answer is (A) since $\ce{HSO_3^-}$ gives its proton out and becomes $\ce{SO_2}$ or $\ce{(SO_3)^{2-}}$ as show in both equations above, it'd rather be an acid. There is also ...
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1answer
20k views

What are some sources of error in the preparation of a standard solution (of sodium carbonate) and a titration (determining the concentration of HCl)? [closed]

When preparing a standard solution of sodium carbonate, what are some sources of error? Also, when conducting a titration, what are some errors involved when determining the concentration of ...
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1answer
241 views

What is the driving force of this reaction?

I know that every reaction that occurs in a solution must have a driving force leading to the kicking out of some ions from the solution. These reactions include redox , double-displacements and acid/...
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1answer
147 views

Different HCl concentrations and iron nails [closed]

Hey guys I am at high school and we have a project on designing our own lab. My questions is will different concentrations such as 10%, 20%, 30% and 37% have an affect on the corrosion of an iron ...
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1answer
933 views

Is dibromine a Lewis acid or base?

Is $\ce{Br2}$ a Lewis acid or base? As it has both, empty orbitals and lone pairs, so if separately asked without any reaction what would we consider it?
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1answer
3k views

How do we perform the isomerisation of 1-butyne to 2-butyne using NaNH2?

How do we perform the isomerisation of 1-butyne to 2-butyne using NaNH2? As a first step, I think that $\ce{NH2^-}$ would remove $\ce{H^+}$ from the third carbon to give an allene intermediate. But I ...
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3answers
2k views

Relation between strength and proticity of an acid

The strength of an acid is related to the number of molecules which have dissociated into hydronium ions in aq solution of that acid while proticity is the number of hydronium ions furnished by 1 ...
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1answer
194 views

Organic Chemistry Inductive and Basic effects

Do all basic groups show +I effect? Or do they simply exhibit an electron donating tendency which has nothing to do with Inductive effects? I can't decide if the electronegativity and basicity are ...
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2answers
12k views

Which of the following is the strongest base?

Which of the following is the strongest base? $\ce{LiOH}$ $\ce{CH3Li}$ $\ce{LiNH2}$ $\ce{LiF}$ According to me the answer should be $\ce{LiF}$ as it has max number of lone pairs but ...
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3answers
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Why are alkali and alkali earth metals indicative of a strong acid? [closed]

Why are alkali and alkali earth metals indicative of a strong acid? Does anyone know why it is so? Or tell me what is indicative of strong acids?
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2answers
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How to tell the pH of HC2H3O2?

Find the $\mathrm{pH}$ of a $\pu{0.500 M}$ solution of $\ce{KC2H3O2}$. I am preparing for an exam on equilibrium and I have two questions: How would I go about calculating this? Is the $\ce{H3O}$ in ...
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1answer
5k views

Basic character of amines [closed]

I learnt that basic character is directly proportional to the positive inductive effect and inversely proportional to steric hindrance Based on the above mentioned properties how is $\ce{(CH3)2NH}$...
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1answer
68 views

Do bases undergo dissociation or ionisation in aqueous solution?

What do bases undergo when dissolved in water: ionisation or dissociation or both? Some books say ionisation while others say dissociation. What is the correct answer?
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2answers
143 views

How can the Brønsted-Lowry theory be valid?

How can an element accept a proton? Isn't this practically impossible? An atom can take an electron and place it in its valence shell to complete its octet or duplet, but, the proton sits back in the ...
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2answers
204 views

pH of strong acid weak acid mixture [closed]

Question: $\ce{H2S}$ ($\pu{0.1M}$; $K_\mathrm{a} = 1.2×10^{-20} $) and $\ce{HCl}$ ($\pu{0.3M}$) with same volume are mixed together. What is the resultant $\mathrm{pH}$? My approach: Let the volume ...
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2answers
404 views

What is the pH of HCl solution at $10^{-8}$M? [duplicate]

After using the negative logarithmic value of $\ce{H^+}$ ion concentration, I get a value of pH that results in base. Can you please help me? Thank you in advance
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1answer
398 views

Why carboxylic group gets protonated preferantially on carbonyl oxygen?

When carboxylic group gets protonated, by strong acid, proton binds rather to carbonyl oxygen, then to hydroxyl. Is that really true? Or maybe it's a case of kinetic vs thermodynamic stability?
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1answer
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Calculating pH of solution of phosphoric acid and ammonia

What is the $\ce{pH}$ of the solution created when $\ce{50ml}$ of $\ce{0.2M}$ $\ce{H3PO4}$ is mixed with $\ce{50ml}$ of $\ce{0.4M}$ $\ce{NH3}$? This problem can be approached rigorously. That's what ...
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1answer
2k views

Salt hydrolysis or buffer solution [closed]

Whenever there a question comes to find the pH of the given solution, I always gets confused to identify the solution if it is a buffer solution or whether it will undergo salt hydrolysis . Can ...
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1answer
64 views

Is neutralized and dried suphuric acid still a hazard? Is it still acidic to touch?

I mistakenly put a sulfuric acid drain cleaner in my bathroom sink. Some of it spilled into the bathroom in my basement. I cleaned it up using baking soda, but I'm concerned if I missed any, whether ...
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1answer
48 views

Why do we need to use oxidation number in order to balance a complex chemical reaction easily in an acidic or alkaline medium? [closed]

I have been trying to balance this chemical reaction in an "acidic" medium without using oxidation number or ion electron method: [$\ce{Fe^2+ + Cr2O7^2- -> Cr^3+ + Fe^3+}$]. Though I can balance ...
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2answers
57 views

Why is the hydroxide ion not considered to be amphoteric [closed]

Why is the hydroxide ion not considered to be amphoteric. Why is $$\ce{2OH- <<=> H2O + O^{2-} }$$ not considered ?? Even though the equilibrium would mostly lie towards the left but still ...
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2answers
60 views

Finding the pH of the solution

In this video, at 3:30 min professor solves two equations $$\ce{H2O —> H+ + OH-}$$ and $$ \ce{HCl —> H+ + Cl-}$$ and deduces $[\ce{H+}] = [\ce{Cl-}] +[\ce{OH-}]$. How come this happen from ...
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1answer
27 views

Calculating the pH of Strong Acid Solutions [closed]

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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4answers
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Titration of Na2CO3 against HCl

$\pu{25 mL}$ of $\pu{0.125 M}$ $\ce{Na2CO3}$ is titrated with $\pu{0.100 M}$ $\ce{HCl}$. Given that $K_\mathrm{a1} = 4.3\times 10^{-7}$ and $K_\mathrm{a2} = 4.8\times10^{-11}$ for the diprotic acid $\...
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1answer
73 views

Why does Ca(CH3CH2CH2COO)2 dissolve in HCl and not in NaOH? [closed]

I do not understand why a strong base, such as NaOH would not dissolve a solid such as this. There would be a double displacement in which you form Ca(OH)2 and NaCH3CH2COO (aq). Why would HCl ...
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1answer
42 views

What is the reaction mechanism between a basic oxide and an acid?

For instance in $$\ce{ Li2O (s) + 2HCl (aq) -> 2LiCl (aq) + H2O (l)}$$ I am wondering why the $\ce{Cl}$ displaces $\ce{Li}$ .I figure that oxygen is negatively charged as it pulls the electron from ...
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1answer
267 views

Why does ammonium chloride form white crystals? [closed]

Why does ammonium chloride ($\ce{NH4Cl}$) form white crystals on top of a test tube when heated?
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1answer
154 views

How do we know that a matter is acidic or basic without knowing their $pH$ value? [duplicate]

There are too many examples for acidic matters as seen below. $$HCI \tag {1}$$ $$HNO_3 \tag {2}$$ $$H_2SO_4 \tag {3}$$ And the examples for basic matters $$NH_3 \tag {4}$$ $$NaOH \tag {5}$$ ...
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2answers
75 views

What do we call ions without basic and acidic properties

According to Brønsted theory, Acids are substances (molecules and ions) donating $\ce{H+}$ Bases are substances (molecules and ions) receiving $\ce{H+}$ I've been trying to find a complete Brønsted-...
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1answer
77 views

How does this oxazolone behave as an acid?

how can you explain the increased acidity (pka around 14) of this oxazolone compared to a standard cyclic amide/lactam)?
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1answer
54 views

Conditions for the reduction of dichromate by manganese(II) to chromium(III) [closed]

The unbalanced redox reaction $$\ce{Mn^2+ + Cr2O7^2- -> Mn^3+ + Cr^3+}$$ occurs in what type of condition? (a) Acidic (b) Basic (c) Neutral (d) Indeterminable
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1answer
51 views

Can concentrated sulfuric acid oxidize iron(II) to iron(III)?

Can concentrated (18 M) $\ce{H2SO4}$ oxidize $\ce{Fe^2+}$ to $\ce{Fe^3+}?$ Or does it actually block the oxidation? I read in some forum somewhere that in order to prevent $\ce{Fe^2+}$ from being ...
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1answer
224 views

Q. 36 2018 molar solubility of CaF2 at pH3 given molar solubility at pH7 and pKa of HF [closed]

This is Q36 on the 2018 Chemistry Olympiad: Calcium fluoride, $\ce{CaF2}$, has a molar solubility of $\pu{2.1e–4 mol L–1}$ at pH = 7.00. By what factor does its molar solubility increase in a ...
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2answers
357 views

Does diluting the titration flask change the molarity

I was solving the following problem on a test and I thought the answer was A, but the answer is actually D. Below is the problem and my reasoning: Answer choice B is clearly incorrect because the ...
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1answer
1k views

Is the relationship between Ka and Kb the same for all acid base pairs? [closed]

What is the relationship between $K_\mathrm{a}$ and $K_\mathrm{b}$ for acid/base reactions. I know for water $K_\mathrm{w}=K_\mathrm{a}\cdot K_\mathrm{b}$, where $K_\mathrm{w}$ is $10^{-14}$. Is this ...
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1answer
55 views

Getting from pH 2 to pH 6 by mixing with water

In our book we learned that we can get an acid to a higher $\mathrm{pH}$ by mixing it with water in the relation $\frac {1}{10} $. Now to my problem: How much water do you need in order to get the $\...