Questions tagged [aqueous-solution]
For questions relating to compounds dissolved in water and resulting reactions.
825
questions
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1answer
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Balancing the chemical equation using Oxidation Number Method
Permanganate ion reacts with bromide ion in basic medium to give manganese dioxide and bromate ion. Write the balanced ionic equation for the reaction.
Please balance the equation using the oxidation ...
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11 views
Calculating the molarity of strontium phosphate from given quantities
10 g of strontium is reacted with 50 mL of 1 M phosphoric acid to form strontium phosphate and hydrogen gas. What molarity of strontium phosphate is formed?
Equation of reaction:
$$\ce{3 Sr(s) + 2 ...
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0answers
36 views
Reacting ZnSO4 with KCl
I'm considering the following reaction:
$\ce{ZnSO4} + 2 \ce{KCl} \ce{->} \ce{ZnCl2} + \ce{K2SO4}$
The high solubility of $\ce{ZnCl2}$ would favour the $\ce{ZnSO4}$ & $\ce{KCl}$ direction of ...
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1answer
59 views
Why does the addition of tetraethyl ammonium bromide reduce solution pH? [closed]
I am looking at a system that adds tetraethyl ammonium bromide to water. Over time, the concentration of tetraethyl ammonium bromide gradually increases, leading to a fall in the pH. I am trying to ...
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1answer
60 views
Is Phosphate (PO4 3-) solube in water? [closed]
Josh~
Superphosphate is used instead of just phosphate because superphosphate is a compound whereas phosphate is an ion. This means that phosphate must attach itself with a cation in order to give a ...
0
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1answer
23 views
Why doesn't the expermintal molar solubility match the one calculated by the Ksp value?
For $\ce{HgCl2}$ ($M = \pu{271.52 g mol-1}$), the reported $K_\mathrm{sp}$ value is $10^{-15.69}$.
This means that the calculated molar solubility of $\ce{HgCl2}$ in water is $(10^{-15.69}/4)^{1/3}\...
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0answers
35 views
What is the acid dissociation constant of AgNO3?
What I'm trying to do is mix $AgNO_3$ and $HNO_3$ in water to make an acidic solution with a given pH value. Since the acidic dissociation constant of HNO3 is known ($p_{Ks}=-1.32 $ according to ...
2
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1answer
61 views
Relationship Atmospheric Gases and Ocean Gases [closed]
If this question is better suited for the Earth Science StackExchange or another StackExchange please let me know.
Edit 1: Modified for clarity and brevity.
Something that's unclear to me is the ...
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0answers
63 views
Solubility product constant of copper(II) bromide in water
One of the questions from chegg.com mentions $K_\mathrm{sp}(\ce{CuBr2}) = 6.3\cdot 10^{-10}$, but I suspect this value might be incorrect.
Could anyone confirm or refute that $K_\mathrm{sp}$ value?
...
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2answers
98 views
Why doesn't the solute settle out of a solution, such as brine or sugar water? [closed]
If I have a solution of salt or sugar dissolved in water, the solute will never settle out or "fall to the bottom", no matter low long I wait. Why is that?
Since salt and sugar (in their pure, solid ...
1
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1answer
43 views
How a titration curve is affected when a poorly soluble salt is formed?
Suppose that I have $\pu{100 mL}$ solution of strong acid, $\ce{HA}$, at $\pu{0.10 mol L^{-1}}$.
This solution is titrated with a strong base solution, $\ce{BOH}$, at $\pu{0.10 mol L^{-1}}$.
Suppose ...
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0answers
33 views
Why is solubility of AgCN is higher in acidic buffer?
Solubility of $\ce{AgCN}$ is maximum in
A) Acidic buffer solution
B) Basic buffer solution
C) Pure water
According to me, it should not matter in which solution we are putting the $\ce{AgCN}$...
1
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1answer
44 views
Why do we use hydrochloric in the test for sulfate ions but nitric acid for halide ions?
Recently, I have learnt about testing for ions in qualitative analysis (BBC Bitesize).
The link above which I used for reference mentions that for the test for sulfate anions, hydrochloric acid $(\ce{...
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1answer
79 views
How Would A Vast Mixture (Like an Ocean) of Ammonia-Water Behave in Terms of Evaporation and Freezing?
First, I'll go ahead and say I'm not very versed in chemistry. My question comes from my interest in planetary-sciences, specifically the speculation that there are likely exoplanets and moons with ...
1
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1answer
26 views
The time-dependent pH value in a fermentation
I want to know if someone has supporting tips or solutions to my problem:
In biotechnology, fermentations are used to grow microorganisms. These need a specific media/broth in which temperature, pH, ...
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0answers
15 views
Viscosity and concentration of solutions
I will need a fluid around a specific viscosity, using a mixture of water and something like sugar.
Is there a way to calculate viscosity based on concentration?
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1answer
52 views
How does sodium carbonate reduce pH?
Sodium carbonate is used in pools to raise pH. From my understanding, it would dissociate in water like so:
$$\ce{Na2CO3 <=> 2 Na+ + CO3^2-}$$
To raise pH, doesn't it have to absorb hydrogen ...
6
votes
1answer
195 views
How to derive the conductivity titration curve which accounts for salt formation
I derived an equation that gave me the volume of base required to get a certain $\mathrm{pH}$:
In a titration between a weak acid $\ce{HA}$ and weak base $\ce{B}$ (adding base into acid solution) the ...
1
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0answers
54 views
Reaction of Lead(II) Chloride and Ammonia
While searching how to identify cations in a solution I found that ammonia could be used to distinguish between $\ce{AgCl}$ and $\ce{PbCl2}$ precipitates after $\ce{HCl}$ had been added.
Why does ...
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0answers
30 views
Why decanted solution should be colorless when determining formula of unknown chloride?
I was following the guide “Stoichiometric Determination:
Empirical Formula of Copper Chloride”.
Under the Procedure section the following reaction is given:
Producing solid $\ce{Cu}$ from a $\ce{Cu(...
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1answer
37 views
Why does silver (I) have a larger lattice enthalpy and hydration enthalpy than sodium?
The ionic radius of the $\ce{Ag^+}$ ion is $129$ pm, and that of the $\ce{Na^+}$ ion is $116$ pm.
Since the sodium ion is smaller than the silver ion, it makes sense that it has a stronger polarizing ...
1
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1answer
42 views
Acid solution — lower pH when diluted
Today I came across a "thought experiment" regarding $\mathrm{pH}$ of a diluted acid solution. This idea looks somewhat logical but obviously contradicts the reality. Can you show me where is the ...
0
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1answer
41 views
Molar conductivity of transition metal complexes solutions [closed]
Which of the following has the highest molar conductivity?
(A) Diaminedichloroplatinum(I)
(B) Tetraamminedichlorocobalt(III) chloride
(C) Potassium hexacyanoferrate(II)
(D) Hexaaquochromium(...
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1answer
64 views
Titration of barium(II) hydroxide by hydrochloric acid
$\pu{25 ml}$ of $\pu{0.024 M}$ $\ce{HCl}$ is titrated into a volumetric flask which initially contains $\pu{45 ml}$ of $\pu{0.034 M}$ $\ce{Ba(OH)2}$. Calculate the $\mathrm{pH}$.
This is how I ...
2
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2answers
115 views
Potassium carbonate vs. Potassium hydroxide in Wood Ash
I'm trying to get more concrete information about the chemical process of creating soap from wood ash.
What I’m confused about: Many soap-making materials say that you create potassium hydroxide ...
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0answers
35 views
Which of acid aqueous solution 1) to 4) is non-volatile one?
I am working on my scholarship exam practice assuming high school chemistry knowledge and struggling at how I can rationalize this question.
Which of acid aqueous solution 1) to 4) is non-volatile ...
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1answer
21 views
Solubility: Is the common ion effect proportional to individual solubility values?
I'm trying to grasp how solubility works in real applications. Is it so that in a solution with only one salt, it's solubility will change upon the addition of another salt with a common ion in a ...
1
vote
1answer
47 views
Products of the reaction between chromium(III) chloride, zinc and sulfuric acid
The aim of my experiment was to make a Cr(II) aquacomplex in situ, and for that I have the reaction:
$$\ce{CrCl3·6H2O + Zn}$$
and I add concentrated sulfuric acid to it. I know that chromium(III) ...
1
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0answers
11 views
How do I go about either finding or calculating Aluminum-Oxalate salt solubility values in aqueous medium?
Water would contain other salts which may complicate things a bit. But finding out the Aluminum-Oxalate salts solubility values in pure water would be a good indicator already. It's for temperatures ...
2
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2answers
87 views
Does adding solutes to water alter its triple point? [closed]
Does adding solutes to water alter its triple point? If yes, how do we find the new temperature and pressure of this point?
2
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1answer
55 views
Mixing cobalt(III) hydroxide and thallium(III) hydroxide
A simple question on solutions is driving me crazy. At this point, I think the textbook's wrong. Here's the question:
A saturated solution of cobalt(III) hydroxide $(K_\mathrm{sp} = \pu{1.6e-44})$ ...
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0answers
36 views
Over time what happens to soluble liquids with different densities
I have a case with two liquids: Water and another chemical which is miscible in water.
The chemical has a density of 800 g/l so it's 20% less dense than water.
Initially the chemical was mixed with ...
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2answers
47 views
Is this balanced redox equation correct? [closed]
I'm trying to balance an equation using oxidation numbers
$\ce{MnO4^- + H+ + Cl- -> Mn^2+ + Cl2 + H2O}$
my suggestion:
$\ce{MnO4- + 8H+ + 5Cl- → Mn^2+ + 2.5Cl2 + 4H2O}$
the 2.5 $\ce{Cl2}$ is ...
1
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1answer
35 views
Redox titration or iron(II)
The concentration of $\ce{Fe^2+(aq)}$ can be determined by a redox titration using
A. $\ce{KBr}$
B. $\ce{SnCl2}$
C. $\ce{KMnO4}$ (basic)
D. $\ce{KBrO3}$ (acidic)
Can anyone please ...
6
votes
3answers
2k views
How much salt (or any other substance one can find in a kitchen) do I need to add to make water boil at 104 °C? [closed]
I've seen some formulas around in other questions and Google searches, but my chemistry is pretty much dead so I have no clue where to find the relevant values to calculate it myself. I just need to ...
0
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1answer
55 views
Molarity of pure water [closed]
The molarity of pure water is 55.5 M at which temprature is obtained this value? Further, you will come across that 1000 mL = 1000 g (for water only, but at which temprature?)
2
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0answers
50 views
Is it appropriate to approximate solute particles in a dilute solution as an ideal gas?
I was studying osmosis and I came across the formula for osmotic pressure. I decided to see the derivation for osmotic pressure in a dilute solution. The derivation involved an equation involving the ...
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1answer
31 views
Can Diatomaceous Earth be added to another chemical to harden it?
I've researched plenty, but cannot find this answer. If Diatomaceous Earth is 85% Sodium Silicate, could it be added to plaster of paris, with water, to form a hard surface, with the benefit of the ...
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1answer
33 views
What is the final molar concentration (molarity) of the nitrate ions in the resulting solution?
A chemist mixes 16.3 mL of 1.23 M sodium nitrate with 6.28 mL 0.823 M solution of calcium nitrate. What is the final molar concentration (molarity) of the nitrate ions in the resulting solution?
What ...
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1answer
86 views
How to find the concentration of barium ions in a mixture of barium sulfate and barium thiosulfate?
I have a hard time with selective precipitation problem.
A mixture of $\ce{BaSO4}$ and $\ce{BaS2O3}$ is shaken with pure water until a saturated solution is formed. Both solids remain in excess. ...
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0answers
22 views
Henry's law p = kx vs m = kp
What exactly is the difference between the following equations?
$$p = kx \qquad\text{and}\qquad m = kp$$
Is the $k$ in both same, because I have seen same $k$ in textbooks for both equations?
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Comparing vapour pressure of 1 molar vs 1 molal solution of sodium chloride
Say, we have 1 molar solution of $\ce{NaCl}$ and 1 molal solution of $\ce{NaCl}$. Among these, which will have maximum vapour pressure?
I know that vapour pressure will depend on the number of $\ce{...
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0answers
28 views
Do TDS meters measure HCO₃⁻/CO₃²⁻?
I am trying to add $\pu{2 g}$ of $\ce{KHCO3}$ to $\pu{20 L}$ of RO water $(\mathrm{pH} = 5.2)$ which theoretically it will add
$$
\begin{array}{lr}
\hline
\ce{K+} &\pu{10.32 ppm} \\
\ce{HCO3-} &...
2
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1answer
42 views
Neutralisation Reaction Confusion
What will happen when $\pu{1 mol}$ of $\ce{H2SO4}$ reacts with $\pu{1 mol}$ of $\ce{NaOH}$?
Will $\pu{1 mol}$ each of $\ce{NaHSO4}$ and water be formed?
Or will $\pu{0.5 mol}$ of $\ce{H2SO4}$ will ...
1
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2answers
46 views
Heating 2% solution to get 4% solution
I have a 2% solution of Zinc sulfate in water (in heptahydrate form) that I want to turn into 4% solution instead of having to buy 4% solution separately.
Would heating it to 100 degrees Celsius and ...
4
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0answers
59 views
Solubility of PbSO4
The solubility of $\ce{PbSO4(s)}$ increase with the addition of $\ce{H2SO4}.$ Why?
I don't quite understand this. When dissolving $\ce{PbSO4(s)}$ we get the equilibrium equation:
$$\ce{PbSO4(s) <=...
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2answers
100 views
How to reduce surface tension of oil?
I would like to create tiny colored drops slowly falling down in a transparent liquid.
The diameter of the droplets must be around 2mm, and their speed must be approximately 0.5 mm / sec.
For that, ...
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0answers
22 views
How addition of a soluble salt affects equilibrium involving precipitation with a base sharing the same cation?
I have the following reaction at equilibrium:
$$\ce{Ba(NO3)2(aq) + KOH(aq) <=> Ba(OH)2(s) + 2 KNO3(aq)}$$
Will there be a change in the equilibrium if the salt $\ce{KCl}$ is added? Will the ...
1
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1answer
72 views
What are the enthalpy and entropy contributions to carboxylic acids dissociating in water?
Carboxylic acids such as acetic acid do not dissociate much in the gas phase. In aqueous solution, however, they act as acids (proton donors).
$$\ce{CH3COOH(aq) <=> H+(aq) + CH3COO-(aq)}$$
...
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0answers
48 views
Calculating pH of solution
What is the $\mathrm{pH}$ when you dissolve equal amounts of $\ce{NaHCO3}$ and $\ce{Na2CO3}$ in water?
When both of the compounds are dissolved, we will have equal amounts of $\ce{HCO3-}$ and $\ce{...
