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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56 views

Help!! Secret Message! Please! [on hold]

I'm REALLY hoping an angel might be about to help me and my sister with a puzzle we are working on, and we think part of it involves an invisible ink message. It's a big puzzle in a book with many ...
-4
votes
1answer
26 views
5
votes
2answers
188 views

Calculating Buffer Capacity

I completed a titration of Ammonium Acetate buffer solution and to it I added 2M Hydrochloric Acid. I measured the initial pH of the buffer solution before any acid was added and I used methyl ...
4
votes
1answer
43 views

Water reacts or doesn't react?

I know that when you have $\ce{HCl}$, $\ce{H2O}$, and $\ce{NaOH}$ that you produce $\ce{H2O}$ and $\ce{NaCl}$. However some people say water does react and so would think that this 2 step reaction is ...
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0answers
25 views

Chemical reactions between metals and acids and bases [on hold]

How do the following reactions physically appear: $\ce{Fe}$ with $\ce{H2SO4}$ $\ce{Al}$ with $\ce{NaOH}$
5
votes
2answers
57 views

Solvent effects on acidity of ethanoic acid

Is ethanoic acid most acidic in DMSO, water or methanol? I suspect that the conjugate base would be most stabilized by a polar protic solvent (meaning it's weakest in DMSO), however, water and ...
6
votes
2answers
53 views

Selecting between redox and neutralization reactions for a mixture of HCl, H2SO4 and NaOH

I know that you can have 2 acids reacting with 1 base. These 4 reactions are an example of this: $\ce{3 HCl + H2SO4 + NaOH -> 3 H2O + SCl2 + O2 + NaCl}$ $\ce{6 HCl + 4 H2SO4 + 2 NaOH -> 8 H2O ...
0
votes
1answer
19 views

Which effect does adding hydrogen chloride have when determining the concentration of sodium hypochlorite in bleach via titration have?

Many of you might be familiar with this and I do understand this completely, however I do have a question. If you are familiar with this, then this is the equation and this is the question for it. ...
-4
votes
0answers
38 views

Balance chemical equation [closed]

When $\ce{LiOH}$ pellets are added to a solution of $\ce{H2SO4}$, $\ce{LiSO4}$ and $\ce{H2O}$ are formed. How would I balance the equation?
2
votes
1answer
51 views

Thymol Blue - molar absorptivity

I did a lab about spectrophotometry and right now I need the molar absorptivity(ε) of thymol blue in acidic solution and also in basic solution. I have tried looking online but I haven't found the ...
-4
votes
0answers
17 views

Stoichiometry - Neutralization Reaction [closed]

10 grams mixture of calcium carbonate and magnesium carbonate is reacted with hydrochloric acid requiring 1 liter of 0.218 molar acid solution. The resulting solution is diluted to 2 liters. Now, ...
5
votes
1answer
60 views

Determining (approximately) the amount of a strong base needed to change a buffer's pH by a certain number of units

I'm measuring buffer capacity by titrating $\ce{NaOH}$ into a buffer of $\ce {H3PO4 + NaH2PO4}$. I'm measuring buffer capacity by recording the amount of $\ce{NaOH}$ required to increase the ...
3
votes
1answer
50 views

Neutralisation and end point pH

So I just finished my final paper yesterday and I tried to attempt this 8 mark question. I am not sure how to do it. $25\,\mathrm{ml}$ of $0.5\,\%~\mathrm{w/v}$ lactic acid ($\ce{C3H6O3}$, ...
5
votes
1answer
55 views

Investigating a factor affecting buffer capacity

I'm preparing for an experiment to investigate some factor affecting buffer capacity. At the moment, I'm looking at using a $\ce{NH_3}$ ($2\,\mathrm{M}$) $+$ $\ce{NH_4Cl}$ buffer, but I'm not sure ...
1
vote
1answer
27 views

Does DMT-Acetate become Polar in H2O, with added NaCl?

I'm extracting DMT (N,N-dimethyltryptamine) from Acacia confusa via acid/base. I extracted the DMT with $\ce{H2O}$ and acetic acid, converting it to DMT-acetate. Here, I used a non polar solvent, ...
8
votes
2answers
108 views

What is the meaning of cmmol in chemistry?

I came across a unit called $\text{cmmol dm}^{-3}$ in buffer solutions. What does this unit mean?
5
votes
1answer
125 views

Is it possible to create a 4 inch by 4 inch channel through concrete using acid?

I'm trying to figure out a way to eat through concrete without damage pex tubing inside (its a radiant heated slab). Is there any way using some type of acid (hydrofluoric, muriatic ) to eat a 4 inch ...
5
votes
2answers
63 views

How can I choose an indicator for determining the concentration of a base using its pKb values?

I have a base $\ce{M(OH)_{3}}$ having 3 $\mathrm{p}K_{\mathrm{b}}$ values as, $$ \mathrm{p}K_{\mathrm{b}_{1}} = 0.5\\ \mathrm{p}K_{\mathrm{b}_{2}} = 3.7\\ \mathrm{p}K_{\mathrm{b}_{3}} = 7.7\\ $$ If a ...
0
votes
0answers
20 views

Is a negative pH value possible? [duplicate]

Is a negative pH value possible in room temperature...teachers don't tend to teach about the pH of acid or base solutions which are higher than 1M.
3
votes
0answers
165 views

The acidity of group 4 tetrahalides

I've been asked to compare the relative acidity of $\ce{CF4}$ and $\ce{SiF4}$. As both have noble gas structures neither can act as a lewis acid and so I assume the question is inferring that they ...
2
votes
1answer
44 views

Conjugate Acid/base pairs [closed]

Why are these not conjugate acid/base pairs? $\ce{CH3NH3+/CH2NH3}$ I know that the a conjugate base is formed from an acid giving away a proton. $\ce{CH3NH3+}$ is losing a $\ce{H+}$ and to become ...
2
votes
1answer
43 views

What is the necessary volume of concentrated HCl to prepare a solution with a pH of 1.8?

Here is my question: What volume of a concentrated $\ce{HCl}$ solution, which is $36.0\%$ $\ce{HCl}$ by mass and has a density of $1.179~\mathrm{g~mL^{-1}}$, should be used to make ...
2
votes
1answer
16 views

Will bleach combined with any of these chemicals create poisonous gas?

I need to know if a combination of bleach and the chemicals below will create poisonous gas. Will it create chloramine, and will there be any visible gas? 1) Sodium laureth sulfate 2) Sodium citrate ...
3
votes
1answer
91 views

Acidic Strength of Substituted Benzoic Acids

Comparing the acidic strength, the nitro-substituted group is definitely more acidic. This can be reasoned by fact that a higher delta positive charge which develops on the H due to the strong -M ...
3
votes
1answer
46 views

Basicity Alteration Due To Ortho Effect In Methoxy Aniline System

I wanted to ask something more in reference to this question Ortho-effect in substituted aromatic acids and bases Suppose instead of toluidine, 2-methoxy aniline and 3-methoxy aniline are ...
4
votes
0answers
58 views

Protonation of ketone and ester

If there is a ketone and ester functional group in one same compound and I want to protonate with $\ce{HCl}$, which one will protonate first? Is it the carbonyl group in the ketone or the carbonyl ...
7
votes
1answer
170 views

Why is picric acid more acidic than carbonic acid?

I just had a question in a test asking to compare the relative acidity of picric acid (TNP) and carbonic acid, $\ce{H2CO3}$ (not phenol). It turns out that TNP is more acidic. I have no idea why? Is ...
3
votes
1answer
24 views

Does a weak acid undergo it's weak ionization upon the addition of any kind of base?

For an example let's assume we have a weak acid HA . And we add either a strong or a weak base.Then what I want to know is whether the weak ionization of the acid HA taken place?. Weak ...
-1
votes
1answer
45 views

Applying Hess's Law Experiment

I was planning to do conduct an experiment using magnesium and hydrochloric acid and measure the temperature. For this lab, I need a manipulated variable, so I was wondering that would changing the ...
2
votes
1answer
38 views

Strong base, strong acid titration problem

Here is a problem: Titrate 1 M sulfuric acid with 50 ml of 1 M sodium hydroxide solution. What volume of sulfuric acid will be required for neutralization. This is a simple problem. My ...
0
votes
1answer
31 views

Why does pKa of a acid-base indicator equal to the pH when the equivalence point is reached?

To be honest, I just don't get it. I had this question while reading a Chemguide article, on this topic: I think my confusion is caused by the way I look at pKa of acid-base indicator. Should you ...
6
votes
1answer
65 views

What is the reason that tertiary alcohol pKa is higher than primary alcohol pKa?

A tertiary alcohol has a $\mathrm{p}K_\mathrm{a}$ of 18 while a primary alcohol has a $\mathrm{p}K_\mathrm{a}$ of 16. Shouldn't the tertiary alcohol be more acidic since its conjugate base is more ...
4
votes
1answer
27 views

Specific and general acid catalysis

What is the rationalization for calling reactions with rates independent of pH but dependent on the concentration of a particular acid catalyst under "general" acid catalysis, and pH dependent ...
-2
votes
1answer
79 views

How to figure out which two solutions will emit largest heat when they are mixed in same volumes?

How can I figure out which two solutions will emit the largest heat, when they are mixed in same volumes? Then let's assume that there is are five pairs of solutions given: \begin{align} \ce{2NaOH + ...
2
votes
1answer
63 views

Calculating pH of an unknown base, and the pKb

The percent dissociation of a base $\ce{X}$ in a $0.002\ \mathrm{M}$ solution is $4.7 \cdot 10^{-3}\ \%$. What is the pH of the solution and what is the $\mathrm{p}K_\text{b}$ of base $\ce{X}$? The ...
4
votes
0answers
35 views

Dissolving Aspartic acid in vinegar?

I am trying to dissolve aspartic acid into vinegar as use as a carbon source in saltwater aquariums. It does not dissolve. I was told to increase the pH and it will work? What is the best way to ...
2
votes
2answers
35 views

Are the following expressions for Kb (base dissociation constant) equivalent?

Given a weak base such as $\ce{C2H5NH2}$, I usually see the expression for $K_\text{b}$ as $K_\text{b} = \frac{[\ce{C2H5NH3+}][\ce{OH-}]}{[\ce{C2H5NH2}]}$. Are the expressions $K_\text{b} = ...
1
vote
2answers
26 views

Computing pH of a buffer, and concentrations

You pour $50~\mathrm{mL}$ of a $0.0200~\mathrm{M}$ $\ce{HCOOH}$-solution to $150~\mathrm{mL}$ of a $0.0500~\mathrm{M}$ $\ce{HCOONa}$-solution. The $K_\mathrm{a}$ of $\ce{HCOOH}$ is $1.8 \times ...
0
votes
0answers
58 views

Basicity order of methoxy anilines

i have been having some problems with the following question, Arrange o-methoxy aniline,p-methoxy aniline,m-methoxy aniline and aniline in increasing order of their reactivities... the answer given ...
1
vote
1answer
29 views

What ion remains in the largest concentration at equilibrium: 0.1 M H₃PO₄ and 0.2 M KOH?

Mix equal volumes of $0.1~\mathrm{M}$ $\ce{H3PO4}$ and $0.2~\mathrm{M}$ $\ce{KOH}$. What ion remains in the largest concentration at equilibrium? My approach: suppose we mix $1~\mathrm{L}$ of each ...
5
votes
1answer
78 views

Acidity of unsaturated five membered ring relative to seven membered analogue

Which of the following is more acidic? The most acidic proton is positioned on the carbon that is at the top of the above drawings (the methylene hydrogens) on each of the two species as ...
11
votes
2answers
112 views

Why isn't dry CaCl₂ used to dry HCl gas instead of concentrated sulfuric acid?

In our chemistry books (like Concise Chemistry), it is given that concentrated sulphuric acid is used to dry $\ce{HCl}$ gas. But, concentrated sulphuric acid is a strong oxidising agent so, why isn't ...
3
votes
3answers
96 views

Why does a weak acid and a salt containing its conjugate base form an acidic buffer?

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

How to determine the acidity or basicity of dissolved salts?

One kg of each substance below is dissolved in a bathtub full of water. Will it be acidic, basic, or neutral? $\ce{KNO2}$ $\ce{HF}$ $\ce{(CH3)3NHBr}$ $\ce{HO-CH2-CH2-O-CH2-Cl}$ ...
-2
votes
2answers
74 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.
4
votes
1answer
34 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 ...
-2
votes
4answers
65 views

What prevents weak acids from dissociating completely? [closed]

What prevents weak acids from dissociating completely in water?
1
vote
0answers
35 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
vote
1answer
50 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, ...
2
votes
1answer
104 views

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

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 ...