Questions tagged [aqueous-solution]
For questions relating to compounds dissolved in water and resulting reactions and acid-base equilibria.
992
questions
-4
votes
0answers
28 views
Are aqueous solutions soluble in water?
Are already existing aqueous solutions (eg. NaCl in water) soluble in water? Since the solute is already broken up into ions, it shouldn't be, right?
-1
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0answers
27 views
How does solutions of two liquids work?
I'll start by establishing my potentially flawed understanding of solutions:
A solution is a completely homogenous mixture. That means that the two (or more) substances are evenly distributed ...
0
votes
1answer
26 views
how to separate a mixture of sodium chloride and sodium hydroxide
I recently did an double displacement reaction in that I have formed a solution of water with sodium hydroxide and sodium chloride are dissolved in it. now I want to separate both of them
2
votes
0answers
26 views
Colligative properties: why does the size of solute not matter?
Colligative properties are defined as the "properties of solutions that depend on the ratio of the number of solute particles to the number of solvent molecules in a solution, and not on the ...
-2
votes
1answer
37 views
How to make SiO₂ hydrophobic aqueous-solution [closed]
I bought 100g of SiO₂ hydrophobic of 20 nanometers. I'm trying to make my own "car body wax". This "wax" that you can buy on the internet allows to make water repellent on car ...
-1
votes
0answers
4 views
How do alkaline fuel cell electrodes allow ions through while not letting the electrolyte through?
I’ve been reading about how alkaline fuel cells work and there is something I don’t understand. Like the picture shown in the diagram above the electrodes separate the gases from the electrolyte which ...
1
vote
0answers
29 views
Why is aqueous solution of lauyl glucoside alkaline?
What is the reaction of dissociation of lauryl glucoside? It's aqueous solution pH is much higher than 7, it's definately alkaline. Why is that? It's nonionic surfactant and as far as I know it only ...
0
votes
2answers
72 views
Fermentation of glucose
I have trouble understanding as to what the last part of the increase in liquid level means. I believe this is the foam formed after the fermentation? I am calculating for the pressure but I have ...
0
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0answers
15 views
Preventing Precipitation/Undilution: Shall I Try Another Solvent?
Thank you for your time in advance.
Our facility is about $\pu{4000 ft}$ in terms of elevation.
One of the main chemicals we manufacture is RAD140 or $\ce{C20H16ClN5O2}$.
We use DMSO ($\ce{(CH3)2SO}$),...
1
vote
0answers
16 views
Alkalinity measured by titration after degassing of CO2
I recently received some lab results from a sample which contained a lot of CO2, which degassed before the total alkalinity was measured by titration to a pH 4.5 end point. The best analogue for this ...
-1
votes
1answer
34 views
Resulting ions concentration after mixing solutions
$\pu{1 g}$ of $\ce{NaHCO3}$ and $\pu{2 g}$ of $\ce{Na2CO3}$ were dissolved in $\pu{50 mL}$ of water known as solution A. Solution A was mixed with $\pu{450 mL}$ of $\pu{0.154 M}$ of $\ce{NaCl (aq)}$ ...
0
votes
1answer
22 views
Solving detergent powder in a solution
I used a detergent powder mixed with water to clean my espresso machine. Some micro particles of powder are stuck into machine's inner tank. So when I pull the hot water out of the machine's nozzle, ...
-1
votes
1answer
50 views
How does chromium behave in a carbonate solution? [closed]
I'm wondering how chromium (as a metal or as a salt) behaves in a concentrated carbonate solution. Will it form any, one or several carbonate specie(s)? Will the metal solubilize? How does it affect ...
0
votes
1answer
33 views
NaHCO3 decomposition dynamics and extent vs Temperature
I'm wondering approximately how fast and to which extent $\ce{NaHCO3}$ will decompose (to $\ce{CO2}$ and $\ce{H2O}$) at $50$, $60$, $70$, $80$, $90$, $100$, $110$, $120$, and $\pu{130 ^\circ C}$.
It ...
0
votes
1answer
56 views
Preparing aqueous solution of ethanol [closed]
You need to prepare $\pu{250.0 mL}$ of an aqueous solution of ethanol in the concentration will be $\pu{0.500 mol L-1}$. You have $\pu{100 mL}$ of a commercial solution of ethanol in water $(35.0\% \,...
1
vote
1answer
76 views
Are all gases equal in their ability to carry with them lower volatility matter at a given temperature? [closed]
As we all know water is a great solvent in it's liquid form relative to other substances. I wonder however how it performs as a gas relative to other stuff.
Does anyone know how well steam carries ...
-2
votes
1answer
22 views
Hydrogen and Hydrogen ion
Is it correct that a hydrogen atom only has 1 electron and 1 proton since the atomic mass is 1?
Also, is the hydrogen ion composed of a single proton and no electrons?
In an ionization process we know ...
-1
votes
2answers
71 views
Copper anode dissolves in electrolysis of copper sulfate solution [closed]
I did an experiment with copper sulfate where you place two copper rods in an aqueous solution of copper sulfate. You apply an electric current and copper metal builds up on the cathode. I noticed ...
0
votes
1answer
34 views
Aluminum powder from aluminum sulfate?
I recently did the experiment where you drop a piece of iron in an aqueous solution of copper sulfate. After a while, the piece of iron gets coated with a fluffy coating of copper that can be dried ...
0
votes
1answer
41 views
Determining the mass of a substance using calibration curve produced by HPLC
I hope everyone is doing well and safe! Yesterday, I was fortunate enough to be taught about how to read a chromatography calibration curve through this stackexchange! Special thanks to those who ...
-1
votes
2answers
59 views
Determining the formula of sodium carbonate hydrate using acid-base titration [closed]
I found this question online at mathsmadeeasy.com:
Sodium carbonate exists in hydrated form, $\ce{Na2CO3 · x H2O},$ in the solid state. $\pu{3.5 g}$ of a sodium carbonate sample was dissolved in ...
0
votes
2answers
34 views
Composition of arcanite (potassium sulfate) agricultural grade. Potassium content of random drawn sample?
I bought potassium sulfate from this source:
Potassium sulfate granulate
I'm using it as a potassium additive in hydroponics. The composition is listed as K2O = 50%, S = 18%. This equals about 41.5% K ...
3
votes
1answer
40 views
Vapors of Aqueous solutions
I'm dealing with a common photoresist developer TMAH (tetramethylammonium hydroxide) and attempting to design a vapor sensor for a sealed chamber. Now I havent been able to confirm what exactly is ...
0
votes
0answers
32 views
Arrhenius acids and bases
According to the Arrhenius definition of acids:
An Arrhenius acid is any species that increases the concentration of
hydrogen ions in its aqueous solution.
Hydrogen Chloride gas ionises in water to ...
-3
votes
1answer
45 views
Behavior of ionic salts in solution
The electrons of an isolated sodium chloride bound pair in vacuum reside at a semi-classical level in their ground state, so that the Born-Oppenheimer approximation applies, and the 'molecule' acts ...
2
votes
1answer
38 views
Identification of aqueous solutions of sodium hydroxide, sodium acetate and potassium thiocyanate using nickel(II)
I'm very new to chem — taking an intro to chemistry course where we are currently focused on substance identification. I have two substances, both aqueous solutions of either $\ce{NaOH},$ $\ce{KSCN},$ ...
0
votes
2answers
47 views
Is an aqueous solution of potassium bicarbonate acidic or basic in nature?
The following is the definition of an acid salt according to my textbook:
The salts formed by the partial replacement of the replaceable hydrogen atoms (H+ ions) of an acid molecule by a metallic or ...
0
votes
1answer
78 views
Density of a sodium hydroxide solution
The specific gravity of a $50\%$ aqueous solution $\ce{NaOH}$ is $\pu{1.5298 g cm-3}.$
To my understanding, the $50\%$ means $50$ mass fraction $w,$ i.e. $\pu{500 g}$ $\ce{NaOH}$ in $\pu{500 g}$ $\ce{...
0
votes
0answers
37 views
Generating hypochlorous acid for disinfecting water using HClO2
I use a product that contains $\pu{700 ppm}$ of $\ce{HClO}$ to disinfect water at $\pu{1 ml}$ per $\pu{1 l}$ and let it rest for about $\pu{2 hrs}$ before I use it so there is no $\ce{HClO}$ left ...
0
votes
0answers
31 views
Zinc salt with a very high relative aqueous solubility?
Zinc bromide, iodide, and chloride are highly soluble in water, both in absolute terms, and relative to other metals. I think however that there is a zinc compound with even higher relative aqueous ...
0
votes
1answer
69 views
Find volume of ammonia gas required to prepare a solution of given pH [closed]
Calculate the volume of gaseous ammonia $(K_\mathrm{b} = \pu{1.8E-5})$ to dissolve (at NTP) in $\pu{100 mL}$ of water in order to obtain a solution with $\mathrm{pH} = 11.0.$ Consider volume variation ...
2
votes
2answers
61 views
Does magnesium sulfate in aqueous solution form magnesium (hydrogen-)carbonate when hydrogen carbonat is present?
I'm using an additive of magnesium sulfate to complement my fertilizer. The additive lists the following ingredients:
I know that it does NOT contain magnesium oxide, because due to historical / ...
4
votes
1answer
118 views
Common Ion Effect - Ionic Equilibrium
Question
In which of the aqueous solutions of the following, dissociation of $\ce{NH4OH}$ will be minimum?
A) $\ce{NaOH}$
B) $\ce{H2O}$
C) $\ce{NH4Cl}$
D) $\ce{NaCl}$
My Thoughts
My book says that ...
0
votes
1answer
50 views
Additive for water to increase the viscosity to a value between 5 and 20 cP [closed]
Is there an additive that I can add to water that will increase the viscosity to a value between $5$ and $\pu{20 cP}$? Ideally, I would like the mixture to be newtonian and since I will be working ...
0
votes
1answer
31 views
Creating 100mg/L aspirin solution
I plan on creating 100 mL of 100mg/L aspirin solution by dissolving 10 mg of pure aspirin powder in 100 mL of buffer solution (of different pHs). Problematically, aspirin doesn’t tend towards ...
13
votes
5answers
3k views
Is it possible to achieve a level of “truly zero” concentration? [duplicate]
If we take some aqueous solution and dilute it further and further, will the concentration of the solution ever get to zero? I would say no, simply because total dilution implies that all the ...
1
vote
1answer
57 views
Molar conductivity of coordination compound [duplicate]
The compound is $\ce{[Cr(H2O)6]Cl3}$. Which isomer has least molar conductivity ?
Correct answer : $\ce{[Cr(H2O)4Cl2]Cl.2H2O}$
My answer : $\ce{[Cr(H2O)3Cl3].3H2O}$
Molar conductivity is directly ...
0
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0answers
22 views
What is the pka of dibromoacetic acid?
There is a reference of 1.48 value at room temperature which is a different value from an experimental study.
1
vote
1answer
42 views
Conductivity of molten or aqueous salts [closed]
If there is a 1M aqueous solution of 1 liter NaCl (aq), and the molar conductivities of the solution and the chloride ions were found to be $x$ and $y$ respectively, is it accurate to say that the ...
3
votes
0answers
339 views
Number of moles of acidified potassium dichromate required to liberate 6 moles of iodine from an aqueous solution of iodate ions
I came across this question in a recent exam I had taken:
How many moles of acidified $\ce{K2Cr2O7}$ is required to liberate 6 moles of $\ce{I2}$ from an aqueous solution of $\ce{I-}$ ?
So this is ...
0
votes
0answers
57 views
Effect of adding an acid or base to water with respect to concentration of ions
So I know that there's auto-ionization of water according to:
$$\ce{2H2O <=> H3O+ +OH-} \tag{1}$$
If I have pure water where the concentrations of both $\ce{H3O+}$ and $\ce{OH-}$ is $10^{-7}$
...
-3
votes
1answer
44 views
What is the mixing enthalpy of oxygen and water? [closed]
If the question has to be narrowed down it means temperature will be around 35 °C = 95 °F.
3
votes
2answers
197 views
Disproportionation of silver(I) in aqueous solution
Use the following equations to predict whether or not $\ce{Ag+}$ ions will disproportionate in solution:
$$
\begin{align}
\ce{Ag+(aq) + e- &-> Ag} &\qquad E^\circ = \pu{+0.80 V}\\
\ce{Ag^2+(...
2
votes
1answer
51 views
Leaving Group Tendencies in Amide Hydrolysis
When we do hydrolysis of amides in basic conditions, we come across a mechanism in which the $\ce{OH-}$ ion attacks the carbonyl forming an intermediate as given in the photo:
When the carbonyl gets ...
2
votes
4answers
357 views
Help with determining concentration of magnesium hydroxide for a specific pH level
This seems like such an obvious and elementary-level question for someone who has taken high school chemistry, but yet I'm having a difficult time solving it. I need to find the right amount of $\ce{...
-1
votes
1answer
37 views
An equilibrium question involving mixing equal volumes of HCl and H2SO4
Question: Calculate the concentrations of H3O(+) and SO4(2-) in a solution prepared by mixing equal volumes of 0.2M HCl and 0.6M H2SO4. (Ka1 for H2SO4 is very large, and Ka2 for H2SO4 is 1.2E-2)
Here ...
2
votes
0answers
23 views
Isomerization of phosphorylated 2-imino-1,3-dioxalanes into phosphorylated cyclic carbamates
I found a patent dating back to the Soviet Union. The patent number is 256764, and the patent describes the synthesis of phosphorylated cyclic carbamates. Here is a section of the patent, followed by ...
0
votes
1answer
68 views
Calculate molarity given density and mass percentage [closed]
Problem
Calculate molarity of a solution of $\ce{H2SO4}$ with density $\pu{1.198 g/cm3}$ and containing $27~\%$ mass of $\ce{H2SO4}.$
Answer
My approach
I converted the density to g/l. Then i took ...
2
votes
2answers
73 views
Does K2CO3 react in minute amounts with glassware at higher temperatures?
At a temperature of $\pu{750 ^\circ C}$, $\ce{K2CO3}$ and $\ce{SiO2}$ react with each other in substantial proportions, forming $\ce{K2SiO3}$ and $\ce{CO2}$ in the process$\ce{^{[1]}}$.
We all know as ...
2
votes
2answers
43 views
Heat effect on diluting concentrated NaOH solution
I am an engineer in water treatment and have a chemistry question. In water treatment we dose $32\%$ sodium hydroxide solution for $\mathrm{pH}$ adjustment and there is a concern that our dosin lines ...
