Questions tagged [aqueous-solution]
For questions relating to compounds dissolved in water and resulting reactions.
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1answer
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Can I have a homogeneous 2 molal solution of copper(II) sulfate at 20 °C?
I'm doing a high school chem project where I am making a calibration curve of copper(II) sulfate for spectrophotometry in which I make solutions with five different concentrations. The most ...
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3answers
35 views
Solubility and pH
I was reading about antacids. It stated that in earlier times $\ce{NaHCO3}$ and a mixture of aluminium and magnesium hydroxide were used as antacids. In excess $\ce{NaHCO3}$ can make the medium ...
10
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2answers
3k views
Would sodium explode in salt water?
I’ve seen the video etc of sodium being put into freshwater and the reaction of flames/small explosion but I wonder if the same reaction would occur if conducted in salt water such as the ocean.
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0answers
29 views
Equations for Iron (III) Nitrate reacting with Sodium Carbonate? [on hold]
I know that Iron (III) Nitrate reacts with Sodium Carbonate to form a precipitate. But I'm not sure how to write these equations.
I have to also indicate oxidation states (charges on each ion) & ...
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0answers
32 views
Copper sulfate and Postassium iodide Reaction [on hold]
I conducted an experiment with these two aqueous solutions.
I understand that the following is not true: CuSO4(aq) + KI(aq) → CuI2 + K2SO4
This means that since CuI2 doesn't exist, so the ...
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2answers
40 views
Finding mole fraction from molality
Calculate the mole fraction of ammonia in a $\pu{2.00 m}$ solution of $\ce{NH3}$ in water.
What I know is that the formula for mole fraction is
$$X = \frac{\text{no.-of-moles-of-solute}}{\text{(no.-...
1
vote
1answer
27 views
Why is water instead of hydroxide ions used to balance oxygen atoms in redox half equations?
When balancing half equations of redox reactions, $\ce{H2O}$ is used to balance any oxygen atoms? For example, this half equation
$$\ce{NO3- → NH4+}$$
is balanced into:
$$\ce{NO3- + 8 e- + 10 H+ → ...
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1answer
14 views
pH calculation and concentrations of all species present in a solution [closed]
When $\ce{NO2}$ is bubbled into water, it is completely converted to $\ce{HNO3}$ and $\ce{HNO2}$:
$$\ce{NO2 + H2O -> HNO3 + HNO2}.$$
Calculate the $\mathrm{pH}$ and the concentrations of ...
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0answers
12 views
To find out how much urea will separate out? [closed]
I know how to solve the above question I will let water used be 'w' gm and then will apply the formula of decrease in free zing point and then calculate 'w' then it would be subtracted from 250 gm .
...
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0answers
21 views
Why do some cations and anions interact with water to form corrresponding acids and bases(hydrolysis)? [duplicate]
I have seen in my textbook that on cations/anions formed on ionization of salts either exist as hydrated salts in aqueous solutions or interact with water to reform corresponding acids/bases depending ...
0
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0answers
16 views
How to keep magnesium hydroxide suspended in water?
How do I keep 8 g of $\ce{Mg(OH)2}$ suspended in 100 mL of water? Milk of magnesium purchased from the store has $\ce{Mg(OH)2}$ well suspended in the bottles. When I make it, the $\ce{Mg(OH)2}$ ...
8
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4answers
853 views
Ionic compound having highest solubility in water
Which ionic compound has highest solubility in water? I can find CsBr having highest solubility with 1230 g/L at 25 °C.
Note: compounds like ethanol are soluble to any extent in water, but they are ...
0
votes
2answers
65 views
Which of the following is the most acidic salt?
A 0.1 M solution of which salt is most acidic?
(a) Aluminum(III) nitrate $\ce{Al(NO3)3}$;
(b) Magnesium(II) bromide $\ce{MgBr2}$;
(c) Sodium bicarbonate $\ce{NaHCO3}$;
(d) Sodium formate $\...
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0answers
9 views
How to suspend a clay+charcoal+humic acid+soluble fertilizers in water and avoid precipitation?
I am currently working on a concentrated solution loaded with as much clay dust + biochar dust + humic acid powder as possible. I am using water where I have already dissolved N, K, Ca, Mg, S, Zn and ...
0
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1answer
25 views
Evaluate mass of salt needed to add to a buffer solution knowing only pH
This is an exercise taken from an old exam, I'm struggling with the resolution.
To a solution of a generic weak acid $\ce{HA}$ were added $\pu{2.40 g}$ of a potassium salt of the $\ce{KA}$. The ...
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0answers
24 views
How to make rheoscopic fluid using glycol stearate flakes
Rheoscopic fluid can be made by adding mica powder to water. I read that mica powder can settle and condense after sitting around for a long time. So I want to use glycol stearate flakes instead.
...
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2answers
49 views
How to balance this redox reaction taking place in a basic medium?
How to balance this reaction which is taking place in a basic medium?
$$\ce{Al + MnO4- -> MnO2 + Al(OH)4-}$$
My Attempt
Reduction half reaction:
$$
\begin{align}
\ce{4 H+ + MnO4- + 3 e- &-&...
1
vote
0answers
16 views
Dependence of Osmotic Effects on Particle Size
van't Hof's equation for osmotic pressure is derived with the assumption, among others, that the particle size of the solute is comparable to the particles size of the solvent. It holds well so long ...
0
votes
1answer
29 views
Is the water in an aqueous solution undergoing a reaction considered part of the system or surroundings?
System: In chemistry, a system is a chemical reaction. A system operates within its surroundings. Energy can move between the two.
Surroundings: The environment around a particular chemical reaction....
1
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1answer
19 views
Gas solution - State of matter
When a gas is dissolved in water does the state of gas changes ? We write it as aqueous but what is the state that exists ? does it has the properties of gases when it is dilluted ?
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1answer
26 views
How can I get create complex metal ion solution such that the majority of the central metal ions only have one specific ligand?
I'm looking for a way to have the ligand, Chloride ion, datively bond with Copper Sulphate.
I understand it is as simple as creating a solution of Hydrochloric Acid and dissolving Copper Sulphate ...
0
votes
1answer
34 views
Does electrolysis of aqueous tin (II) chloride produce Cl2 or SnCl4? Or both?
When applying a current to an aqueous solution of tin (II) chloride, tin crystals grow from the cathode. However, I'm not sure about the anode. It seems like there are two possible reactions:
$$\ce{...
0
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1answer
22 views
The density of an aqueous solution
Could the density of an aqueous solution be less than 1g/ml ? For an example, can 0.98g/ml be taken as a density for an aqueous sulphuric acid solution ?
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1answer
26 views
Quantity of base needed to neutralise litre of 36% HCl?
Sorry for asking a basic chemistry question. I last did this kind of chemistry at school about 30 years ago and I don't have confidence that I'd get it right from first principles :)
Short version: ...
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2answers
47 views
Every liquid is water [closed]
Is it that every liquid we see is water, with more or less of x substance?
Example: urine is water with salt and minerals
4
votes
1answer
70 views
What component(s) of instant coffee make it deliquescent?
If I put small, separate piles of instant black coffee powder, sugar, powdered creamer, and even something very ionic like table salt out in humid air and come back in a few days, only the instant ...
0
votes
1answer
82 views
Why do nonmetal oxides react with water to form acidic compounds? [closed]
I am confused about the molecular basis by which nonmetal oxides react with water to form acidic compounds. For example, I understand that sulfur trioxide reacts with water to form sulfuric acid as ...
0
votes
2answers
29 views
Why don't ions form crystal lattices in water and other polar solvents?
Ionic compounds are in the form of crystal lattices, and when they are dissolved in a polar solvent, they are bonded with the corresponding cations/anions of the polar solvent. For example, $Na^+$ ...
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votes
0answers
20 views
Atmospheric CO2 Neutralizing Ca(OH)2 in Flume System
The factory I work at has a large flume system that contains sugar and organics. CaO is added to the flume to maintain a 12pH and keep bacterial activity to a minimum. In order to reduce the use of ...
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1answer
47 views
Advice on forming a 10% solution of Maltol
I’m having great trouble forming a 10% solution of Maltol. Specifically, I’m trying to dissolve 3 grams of Maltol in 27 grams of solvent.
I’ve tried everything from Propylene Glycol, to Deionized ...
2
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1answer
103 views
Diluting methanol in water: is it exothermic?
Can someone explain in simple terms why does temperature increase when mixing water with methanol? I do not have a strong background in chemistry, but I usually have to mix both liquids (sometimes ...
0
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1answer
78 views
Insoluble salts and Gibbs free energy
Is it true that according to gibbs free energy equation, insoluble salts such as AgCl don't dissolve because the process would be too endothermic? The right side of the equation, TΔS, would have to be ...
0
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1answer
29 views
Can the ions of dissolved salts be physically separated with a strong enough external electric field?
Say you had a arbitrary amount of sodium chloride dissolved in water. Could an external electric field (e.g. the electrically charged plates in Millikan's oil drop experiment) physically pull apart ...
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1answer
20 views
Will a reverse osmosis membrane exclude perfluorobutanoic acid?
I recently did a water quality test and it showed a detectable level of perfluorobutanoic acid, a potentially dangerous carboxylate PFC.
Will a reverse osmosis water purification system exclude this ...
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1answer
24 views
Reaction of soluble salts
If we were to mix two soluble salts together, for instance sodium nitrate and potassium chloride together, and their products are also soluble, will any reaction still occur? Say if we were to boil ...
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2answers
55 views
Wetting agent for H2O2 solution
I need to increase the wetting of an $\ce{H2O2}$ solution on ceramic surfaces. Does anyone know of a common chemical I can use for this?
The properties it would ideally have are:
Increases wetting ...
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votes
1answer
200 views
vinegar + baking soda = yields far smaller volume of CO2 gas than calculation
I experimented CO2 generation by adding 4 g of 25% acetic acid water solution (=1g of acetic acid) to 1.4g of pure baking soda. But this mixture yielded only 50% less than the calculated amount 373 mL ...
0
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1answer
71 views
Entropy as the driving force for osmosis
How is entropy responsible for osmosis and is movement of solvent possible from its higher concentration to lower concentration?
By concentration, I will be referring to the concentration of solvent ...
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votes
1answer
38 views
double replacement [closed]
$$\ce{KNO3(aq) + BaCl2(aq) -> KCl(aq) + Ba(NO3)2(aq)}$$
I found products but I noticed in product that both of them are in the aqueous phase. So actually no reaction occurs?
Does a reaction need ...
3
votes
2answers
262 views
What is the net ionic equation of the following?
Aqueous chlorine is added to a solution of aluminum bromide in a single replacement reaction which forms no precipitate and bromine liquid. Determine the net ionic equation.
Since this is a single ...
0
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0answers
55 views
Will magnesium chloride and ascorbic acid react in solution?
Both magnesium chloride dissolved in distilled water and ascorbic acid dissolved in distillled water have been separately shown to have a number of health benefits when applied topically to the skin.
...
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0answers
31 views
pH calculation of salt in acid
A person go to an all-you-can eat restaurant but eat a little too
much and get heartburn. He returns to his room, looking for a remedy. He takes $3$ teaspoons of milk of
magnesia, which contains $...
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votes
1answer
35 views
Water boiling with salt and without it [closed]
Does 1L of water with salt boil faster or slower than one with the same amount of water but without salt?
What I know is that since when you add salt to the water the temperature of boiling increase ...
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votes
1answer
38 views
Why don't soluble gases that evolve in a reaction remain in solution?
Take for instance the following process:
$$\text{2NaCl}_{\ (s)} + \text{H}_2\text{SO}_{4 \ (aq)} \to \text{2HCL}_{\ (g)} + \text{Na}_2\text{SO}_{4 \ (aq)} $$
Why does the evolved gas leave the ...
1
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1answer
63 views
Diffusion of CO2 and O2 in Water/Atmosphere System
Consider the following experiment:
One reservoir of pure water is interfacing the atmosphere at standard condition.
Both are at rest and at the same temperature.
Both have no internal gradients (ie:...
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0answers
51 views
Beer's law relationship for light scattering at 90 degrees
First-time poster here
In Beer's law, the ratio of incident light intensity, $I_0$, to exiting light intensity, $I$, is defined as $\log_{10} (\frac {I_0} {I}) = \epsilon L c$. Then, by rearranging ...
0
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0answers
37 views
Equation of state (EoS) for liquid density, in terms of pressure, temperature and concentration
I'm currently in need of an equation to calculate density of aqueous solutions such as acids, bases, and salts. The equations to calculate liquid density that I have found so far do not account for ...
0
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0answers
121 views
Does dissolving sodium carbonate in water produce carbon dioxide?
Does dissolving sodium carbonate in water produce carbon dioxide?
I have been thinking about this for a long time but I'm getting inconsistent answers online.
My thinking is that $\ce{CO3^2-}$ ...
4
votes
1answer
42 views
What is the proper way to prepare a solution aiming to minimize errors?
I am a undergraduate student in chemistry, and my university is very weak in teaching solution preparation. I need to prepare a 10 mg / L methylene blue solution and now the way I do is, using an ...
0
votes
1answer
48 views
Making sulfate from elemental sulfur [closed]
I have $\approx\pu{2 g}$ of elemental sulfur that I need to convert to dissolved sulfate in DI water. What's the easiest lab chemistry that will get me there?
