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Questions tagged [aqueous-solution]

For questions relating to compounds dissolved in water and resulting reactions.

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100 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....
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1answer
26 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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32 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 ...
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1answer
292 views

Does electrolysis of aqueous tin(II) chloride produce Cl₂, 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{2 ...
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1answer
512 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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49 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
96 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
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1answer
205 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 ...
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1answer
872 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 ...
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2answers
40 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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1answer
34 views

Equilibrium expression for dissolution of carbon dioxide

I was asked to give the equilibrium expression for: $$\ce{CO2(aq) + H2O(l) <=> H2CO3(aq)}$$ As water is a liquid and a solvent here, it shouldn't be included in the expression, hence I wrote: ...
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1answer
202 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 ...
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1answer
848 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 ...
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1answer
404 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 ...
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1answer
45 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
36 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
130 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
70 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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1answer
1k 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 ...
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1answer
345 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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1answer
43 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 ...
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2answers
1k 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 ...
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1answer
49 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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1answer
40 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 ...
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1answer
97 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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1answer
91 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 ...
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1answer
68 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?
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1answer
83 views

Do bases undergo dissociation or ionisation in aqueous solution?

What do bases undergo when dissolved in water: ionisation or dissociation or both? Some books say ionisation while others say dissociation. What is the correct answer?
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2answers
2k views

Buffer Solution with Strong Acid?

I was thinking: Could we could make a strong acid-strong base buffer solution? Take, for instance, a mixture of 1 L $\ce{HCl}$ (0.1 M) and 1 L of aqueous salt, $\ce{Na_2SO_4}$ (also 0.1 M), note that $...
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3answers
462 views

How to determine if an unknown is potassium chloride or potassium bromate?

In class, we were given unknown substances. I've narrowed the possible substances down to either potassium chloride or potassium bromate. We were given several acids, indicators, and other chemicals (...
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1answer
41 views

How to meausre ion interferences in solution?

Is there a way to quantitatively measure the interference of different metal ions in solution? I plan to measure concentration of Pb(II), Fe(II), and Cu(II) in solution together using a ...
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1answer
126 views

Find the concentration of proton after adding a acid to NaOH [closed]

I have this simple problem that I cannot figure out though, only the first part. 100 ml of 1.0 $\frac{mol}{L}$ $NaOH_(aq)$ contains ( a ) g of NaOH. After mixing 100 ml of 1.0 $\frac{mol}{L}$ $...
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1answer
71 views

How does the water pollutant sodium nitrate affect the concentrations of other ions in tap (dam) water? [closed]

Context In my assignment I've been given two water samples from the hinze dam. The first sample has been untouched, however the second has been contaminated with an unknown ionic compound. To ...
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2answers
734 views

If acyl chlorides are reacted with aqueous ammonia, will carboxylic acids also be formed?

As part of my A-level chemistry course, I have been taught that an acyl chloride will react violently with water to produce a carboxylic acid and hydrochloric acid. I have also been taught that an ...
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0answers
64 views

Formulation of a suspension of Magnesium Hydroxide

For a school project of mine, I have to formulate a suspension of Magnesium Hydroxide which contains at least 50% of solid matter. This suspension is prepared from Magnesium Oxide 98% with a ...
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2answers
2k views

KCl + CuCl2 in solution, is there a reaction?

I'm wondering if the reaction of $\ce{KCl + CuCl2}$ in solution (aq) will produce any products (have a net ionic equation/solid precipitate)? Using the metal activity series, I see that potassium is ...
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1answer
70 views

Is the ionic solution of a half-cell part of the electrode in a electrochemical cell? [closed]

A simple electrochemical cell consists of two half-cells, that is: a metal solid submerged in a solution. Additionally, there is salt bridge connecting the half-cells. Ex: $\ce{Cu(s)}$ in $\ce{CuSO4(...
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1answer
78 views

Is the electrical conductivity only measurable in aqueous solutions? [closed]

I have been looking for other ways to measure it, but all I've found is through aqueous solutions. So I want to know if there's another way to do it, or why it isn't possible through other means.
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2answers
192 views

Do we consider the dissociation of water when dealing with ion concentrations of a solution?

One mole of hydrated copper(II) sulfate, $\ce{CuSO4 . 5 H2O},$ is dissolved in water. How many moles of ions does the solution contain? 1) 1 2) 2 3) 6 4) 7 The correct answer is 2. ...
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0answers
29 views

Non-hydrate forming salts?

Are there any water-soluble salts that don't form hydrates? Hydration seems very thermodynamically favorable, as evidenced by its abundance. It also makes sense since the solvation and hydration ...
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1answer
60 views

How to determine which ions will pair to form a compound in an aqueous solution?

Let us assume we have an aqueous solution with the ions $\ce{A+}$, $\ce{B+}$, $\ce{C-}$ and $\ce{D-}$. Which ions will form a bond and why? Will the compound formed be $\ce{AC}$ and $\ce{BD}$ or $\ce{...
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1answer
335 views

How many protons does phenolphthalein lose in basic solutions?

So, I've looked it up and Wikipedia claims that two protons are released by Phenolphthalein when pH is over 8.2, but I've seen other sources that claim only one proton is lost. So, is it really just ...
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1answer
142 views

Predict melting point of water CaCl2 solution

I'm doing a science project for my school. I experimentally measured the melting point of water-salt solutions, and I want to compare my results to theoretical melting points, but I encountered a ...
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1answer
32 views

Is there a point where further dilution of ethanol is not exothermic?

Diluting concentrated ethanol with water is exothermic. Diluting 95% refined spirit into 40% vodka makes the resulting product definitely warm. Dilution of 60% absinthe with water that is cool, but ...
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1answer
186 views

Number of water molecules in a box to simulate liquid water [closed]

I have seen that depending on the simulation approach, different number of water molecules are employed for studying liquid water properties. 32 in early DFT calculations The electronic structure of ...
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1answer
347 views

Reactions between aqueous or solid LiOH

I've been working on a project to absorb CO$_2$ from fossil fuel power plants. I found these reactions: $$\ce{2Li(s) + 2H2O(l) → 2 LiOH(aq) + H2(g)} \tag{1} $$ $$\ce{2 LiOH(s) + CO_2(g) → Li2CO_3(s)...
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Why is fluoride good for your teeth?

The main component of tooth enamel is calcium hydroxyapatite. I know fluoride ions can replace hydroxide ions in the enamel matrix, slowing the rate of enamel demineralization. Why does hydrofluoric ...
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2answers
97 views

Crystallisation problem

I have an aqueous solution of N,N-dimethylphenylalanine methyl ester hydrochloride and I need to crystallise it as a salt. I'm afraid of increasing the temperature or the concentration of acid due to ...
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1answer
54 views

Calculating the change in pH upon diluting an acid

What volume of water is added to $\pu{400 ml}$ of $\ce{HCL}$ solution so that the pH of the solution increases by 1 unit This is how far i went but the answer says $\pu{1000 ml }$ where am I wrong is ...
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1answer
107 views

Chemiluminescence of luminol

Recently I have tried to perform an experiment with luminol and hydrogen peroxide (with potassium ferricyanide as the catalyst). Upon googling, I found two ways to conduct this experiment and was ...