All Questions
Tagged with acid-base stoichiometry
47
questions
-5
votes
1
answer
45
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Why should the pH change when I add sodium hydroxide to water? [closed]
I am a student and I am trying to understand the concept of pH.
If I add pure $\ce{NaOH}$ in water, it leads to the formation of $\ce{OH-}$ ions in the water. But this shouldn't lead to any change in ...
0
votes
1
answer
420
views
Find the required water volume to add so that the pH of two solutions will be the same
Question.
We have two flasks: one contains 50 mL of 0.001 M HCl and the other 50 mL of 1M acetic acid.
a) How much water should be added to the more acidic solution so that the pH of the two ...
- 39
2
votes
1
answer
117
views
Difference between change of enthalpy of neutralization between copper and manganese carbonate
I was doing a calorimetry experiment to calculate the change in enthalpy during neutralization reactions between metal carbonates and hydrochloric acid. I experimented with 5 metal carbonates: ...
0
votes
1
answer
139
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Should I write formula for oxalate or oxalic acid while balancing a redox reaction using the ion-electron method?
Problem:
Balance the following reaction using the ion-electron method:
$$\ce{H2C2O4 + KMnO4 + H2SO4 -> CO2 + MnSO4 + K2SO4 + H2O}$$
My book's solution:
Oxidation half-reaction:
$$\ce{C2O4^2- -> ...
- 201
-1
votes
1
answer
66
views
Balanced reaction to Cr given H+ [closed]
The troublesome nature of this post, is that I was given very little information to work with:
"The metal chromium (Cr) reacts with an acid, to create Cr^+3 ions, and hydrogen gas.
Show the ...
- 3
0
votes
1
answer
97
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How much Calcium Hydroxide to manufacture calcium formate?
First, I have no experience with stoichiometry.
I currently manufacture calcium formate for a specific use because here in my country, it is very difficult to get calcium formate in small quantities. ...
0
votes
1
answer
591
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Sodium acetate stoichiometry from baking soda and vinegar
I want to make sodium acetate from sodium bicarbonate and vinegar. I'm a bit stumped at calculating amounts of each reagent. I'm starting with 8% acetic acid vinegar. I was going to add, to 1 L of the ...
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1
vote
1
answer
969
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NaOH + atmospheric CO2: Unexpected results troubleshooting
I've conducted an experiment where a solution of $\pu{4.2 M}$ $\ce{NaOH}$ was left exposed to atmospheric $\ce{CO2}$ for a period of time and titrated using potentiometric titration and potassium ...
- 111
0
votes
2
answers
84
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Writing a chemical equation with a reactant of unspecified chain length [closed]
Would appreciate it if I got some general tips and hints and not the solution cause I'm trying to learn from this question :)
The question is as follows:
FA1 is a solution containing $\pu{5.00 g dm-3}...
user104941
0
votes
2
answers
151
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Is this stoichiometric question answerable? (unknown variable)
This question kind of borders on the fields of both semantics and math, as well as chemistry, but I still believe this is the right place to ask.
On a test I took, a question was posed as such:
Via ...
- 205
0
votes
0
answers
33
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When multiple sources give the content of an ingredient my an unqualified percentage, can I safely assume this is by weight? Or; it's not a wart
I am trying to make a simple scented shampoo and body soap for my own use and for Christmas gifts.
I statr with a base of 32 oz – (a bit under a kg) of a mild commercial castille soap (Dr. Bronner’s ...
- 167
1
vote
2
answers
925
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Calculation of pH in acid base reaction
This problem(from ionic equiibrium) states:
We are given $\pu{40 mL}$ of $\pu{0.1 M}$ $\ce{HCl}$ and $\pu{10 mL}$ of $\pu{0.45 M}$ $\ce{NaOH}$ in two separate beakers. These two solutions are mixed. ...
- 147
0
votes
0
answers
77
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Strong Base and weak acid reaction problem
I got the above problem correct by setting up the net ionic equation and finding the limiting reactant. I found that there were 0.01076 moles of NaOH left, and then calculated it's molarity which led ...
- 9
2
votes
1
answer
252
views
What did Richter mean regarding an acid base reaction?
Recently I've been reviewing concepts belonging to the history of chemistry. But I came stuck at trying to understand a passage which I read from wikipedia entry (and which it seems has been mentioned ...
-2
votes
1
answer
71
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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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-1
votes
2
answers
5k
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Why does vinegar and baking soda yield a far smaller volume of carbon dioxide gas than expected from calculation?
I experimented $\ce{CO2}$ generation by adding $\pu{4 g}$ of $25\%$ acetic acid water solution ($= \pu{1 g}$ of acetic acid) to $\pu{1.4 g}$ of pure baking soda. But this mixture yielded only $50\%$ ...
- 11
1
vote
2
answers
212
views
Weight of sodium acetate required to get to certain pH
How many grams of $\ce{CH3COONa}$ we need to dissolve in $\pu{2.50 L}$ of water to get a solution with $\mathrm{pH} = 9.00$? Given $K_\mathrm{a}(\ce{CH3COOH}) = 1.75\cdot 10^{-5}$
Like solving a ...
- 305
2
votes
1
answer
2k
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Mixing Ca(OH)2 with Ca(NO3)2
Mixing $\ce{Ca(OH)_2}$ with $\pu{0.1 M}$ concentration of $\ce{Ca(NO3)2}$.
What will actually happen in the process? What I will see with my eyes? I know that $\ce{Ca^2+}$ cation with concentration ...
- 305
0
votes
1
answer
513
views
Equivalent weight of the anhydrous acid [closed]
The cupric salt of a monobasic acid contains $3$ molecules of water of hydration per atom of $\ce{Cu}$. $\pu{1 g}$ of hydrated salt yielding on strong heating $\pu{0.3306 g}$ of $\ce{CuO}$. What is ...
- 167
1
vote
2
answers
390
views
Neutralization of alkali solution by a mix of strong acids
$\pu{0.1 M}$ $\ce{HCl}$ and $\pu{0.2 M}$ $\ce{H2SO4}$ solutions are mixed in equal volume. This solution is diluted to double the volume. Find the volume of $\pu{0.1 M}$ $\ce{NaOH}$ which can be ...
- 141
0
votes
2
answers
452
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Calculation for buffer of pH 5 in sodium fluoride solution
From a journal:
$\pu{500 mL}$ of $\pu{50 ppm}$ fluoride at $\mathrm{pH}~5$ was prepared by mixing $\pu{0.0552 g}$ of sodium fluoride with $\pu{4.1057 g}$ of sodium acetate and $\pu{1.65 mL}$ of ...
- 23
1
vote
2
answers
21k
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What's the best way to interconvert between molarity and percentage?
Let's say that I want to convert concentration of an acid from % to molarity.
One way I found to do this is by using the following formula:
percentage = (molarity * molar mass) / 10.
Another way is ...
- 202
0
votes
1
answer
273
views
Why doesn't hydroxide concentration equal concentration of carbonic acid and bicarbonate in a sodium bicarbonate solution?
To find the pOH of solution of $\pu{0.42 M}$ of $\ce{NaHCO3}$, given a $\ce{Kb}$ of $\pu{2.4E-8}$, my solution manual does the following steps:
Reaction is similar to : $\ce{HCO3- + H2O <=> ...
- 2,853
0
votes
0
answers
63
views
Theoritical amount of Sodium Bicarbonate
I have to find the theoretical amount of sodium bicarbonate. The steps I followed in order to produce it are:
15g $\ce{NaCl}$ are added to a beaker. Then we add 87.5 mL of $\ce{NH3}(12M)$
We add 115g ...
user40808
3
votes
2
answers
827
views
If there are multiple bases in solution and a strong acid is added, will both bases react?
For example, if there is one mole of carbonate ions ($\ce{CO3 ^2-}$) and sulfate ions ($\ce{SO4 ^2-}$) in a solution, and one mole of hydrochloric acid ($\ce{HCl}$) is added, will the one mole of ...
- 309
0
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1
answer
1k
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Why is finding [H+] when given [OH-]= 3.57e-5 M wrong when I use -log[OH-]?
Question/Problem
I know that [H+][OH-]=$10^{-14}$
And the problem asks to find out the concentration of H+ when the concentration of OH- is $3.57*10^{-5}$M
By using the equation above i find that ...
- 300
2
votes
2
answers
10k
views
Why is potassium phosphate KH2PO4 in this reaction?
This is a continuation of this question because the first thing that came in my mind is that why potassium phosphate in this reaction is $\ce{KH2PO4}$ and not $\ce{K3PO4}$?
In the wikipedia article ...
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1
vote
2
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3k
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How to balance the equation for the reaction of aluminum bicarbonate and hydrochloric acid?
Here's what I have to balance:
Solid aluminum bicarbonate and hydrochloric acid combine to form an aluminum chloride solution and carbonic acid.
Or in an equation form:
$$\ce{\text{__ } Al(...
- 614
2
votes
2
answers
2k
views
Balanced equation for neutralisation reaction betweeen potassium carbonate and hydrochloric acid
They seem all correct to me, is there any reason why one reaction would happen over the other(s)?
$$\begin{align}
\ce{K2CO3 + 2 HCl &-> 2 KCl + H2CO3}\\[6pt]
\ce{K2CO3 + 2 HCl &-> 2 KCl ...
- 21
5
votes
1
answer
1k
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Back titration of excess HCl used for dissolving limestone
$15.0~\mathrm{mL}$ of $1.4~\mathrm{M}\ \ce{HCl}$ was mixed with $1.00~\mathrm{g}$ of limestone (impure $\ce{CaCO3}$) until all the solid had dissolved. The solution was then transferred to a conical ...
- 51
3
votes
1
answer
11k
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How to find the concentration of an of ammonia solution by titration with nitric acid?
I am stuck with this question I am doing:
To determine the ammonia ($\ce{NH3}$) concentration in a cleaning product, a chemist diluted 20 mL of the product to 500 mL. Of the 500 mL solution, 25 mL ...
- 219
1
vote
1
answer
209
views
Finding pH using the -log, why does my calculation differ from the book's answer?
An aqueous solution containing 0.0020 mol/L barium hydroxide, what is the pH? I do the following: 14-(-log(0.0020))=11.3pH. The answer is 11.6.
2.0*10^-3 mol/L sodium hydroxide solution, what is the ...
-1
votes
4
answers
1k
views
pH of Strong Acid (and why it seems like it should be zero)
I understand the Henderson-Hasselbalch equation for acids that do not completely dissociate but I am having trouble calculating the pH of a strong acid using the equation: for example a .25 m solution....
- 265
2
votes
2
answers
3k
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Application of limiting reagents and acid-base stoichiometry
I'm having a bit of trouble with the latter questions of this problem.
$\pu{15.0 mL}$ of $\pu{1.4 M}$ $\ce{HCl}$ was mixed with $\pu{1.00 g}$ of $\ce{CaCO3}$ until all the solid had dissolved. The ...
- 37
1
vote
1
answer
3k
views
Volume of dibasic acid required to neutralise 0.04 mole of OH-
The volume of 0.1 N dibasic acid sufficient to neutralize 1 g of a base that furnishes 0.04 mole of OH− in aqueous solution is:
200 mL
400 mL
600 mL
800 mL
Since it is a ...
- 13
5
votes
1
answer
15k
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Creating Boric Acid from Borax and Hydrochloric Acid
I'm working on an experiment in school and I need to create 200 mL of 2 mol/L boric acid. According to a formula I found on wikipedia, boric acid can be created with a reaction with ...
- 153
8
votes
1
answer
805
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Why do these two calculations give me different answers for the same acid-base titration?
In class, I performed an weak acid-strong base titration using commercial white vinegar and sodium hydroxide with the aim of finding the concentration of of ethanoic acid in the vinegar, and I used ...
- 419
-1
votes
1
answer
97
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I forgot the basics of writing equations, or maybe it is not me? [closed]
Sulfuric acid is commonly used for the pickling of iron to remove surface rust before galvanisation.
$$\ce{Fe2O3 (s) + 3H2SO4 (aq) -> Fe2(SO4)3 (aq) + 3 H2O (l)}$$
However, I am not sure if given:...
- 330
1
vote
0
answers
758
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Molar heat of reaction for water in a neutralization reaction
I have a simple lab problem:
$30\ \mathrm{mL}$ of $1\ \mathrm{mol/L}$ $\ce{H2SO4}$ reacts with $50\ \mathrm{mL}$ of $1\ \mathrm{mol/L}$ $\ce{NaOH}$ in a neutralization reaction as per the following ...
- 111
1
vote
2
answers
1k
views
Can acid concentration be determined from Ka values in a titration? [duplicate]
Say I have a sample of vinegar and I want to find the concentration of ethanoic acid in it. So I perform a titration using a $\mathrm{pH}$ meter, and using that data I can draw a $\mathrm{pH}$ curve ...
- 419
3
votes
1
answer
1k
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How Many mL of 1.0M HCl Would be Required to Completely Decompose Sucrose into Glucose and Fructose?
I am currently conducting an experiment into the glucose content of certain sports drinks. However, I have hit a roadblock. A majority of the drinks that I intend to test, contain sucrose. I am ...
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6
votes
1
answer
2k
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Calculating pH in titration of monoprotic weak acid with strong base
$25.0\:\mathrm{ml}$ of $0.10\:\mathrm{M}$ $\ce{CH3COOH}$ is titrated with $0.10\:\mathrm{M}$ $\ce{NaOH}$. What is the $\mathrm{pH}$ after the addition of $30.0\:\mathrm{ml}$ $\ce{NaOH}$?
In broad ...
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8
votes
2
answers
7k
views
How to calculate the pH of an acetic acid/ calcium acetate buffer?
Problem:
A buffer was made by mixing $\pu{500 mL}$ of $\pu{1 M}$ acetic acid and $\pu{500 mL}$ of $\pu{0.5 M}$ calcium acetate.
What are the resulting concentrations of acetic acid (henceforth ...
- 81
2
votes
1
answer
30k
views
How to calculate the volume of a sodium hydroxide solution necessary to add to water, to raise the pH to a certain value?
What volume of $\pu{0.300N}\, \ce{NaOH}$ would be needed to bring $\pu{16.0 mL}$ of distilled water that has a $\mathrm{pH}$ of $7.00$ to a new $\mathrm{pH}$ of $12.42$?
This is my attempt at a ...
- 21
0
votes
1
answer
2k
views
Calculating concentration and volume in acid metal reactions [closed]
In the reaction:
$$\ce{3 Zn + 2 H3PO4 -> Zn3(PO4)2 + 3H2}$$
I know the initial mass of $\ce{Zn}$ to be 13.08 g and the volume of phosphoric acid to be 0.5 $\mathrm{dm^3}$. How do I work out the ...
- 1
2
votes
2
answers
998
views
When mixing lye and citric acid, which citrate will form?
I'm trying to combine precise amounts of citric acid and lye to get sodium citrate with minimal amount of reacted acid/base. I'm not so sure how stochiometry works, but I could sure learn that from ...
- 2,518
1
vote
1
answer
4k
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Buffers calculating amounts of acid & base
Quick run down, I was given pH of buffer 4.5 and then pKa of acid 4.79
I then had to work out volume of acid and volume of base using $\text{pH=pKa}+\log_{10}{\left(\dfrac{[\ce{A-}]}{[\ce{HA}]}\right)}...
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