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

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How do I create a transparent liquid for ferrofluid display?

Hello~ I am a media art artists working in Korea. Recently, create a kinetic artwork using ferrofluid. I need to create an artificial pond with a diameter of 3 meters. So I need a lot of suspension ...
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14 views

Is there anyway to “raise” the octanol water partition coefficient of any compounds?

I'm wondering if there's anything that acts like salt which raises the octanol water partition coefficient of molecules. It would be great if anyone could give any feasible options such as low cost ...
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1answer
36 views

Low solubility of propanal compared to propanol, propanone, propanoic acid and methyl ethanoate

I found on the internet that propanol, propanone, propanoic acid and methyl ethanoate where all completely soluble in water at room temperature. (23 degrees Celsius) But I found that propanal was, ...
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2answers
150 views

Is water acidic enough for an redox reaction involving H+?

If you stored $\ce{Pb(NO3)2(aq)}$ in a $\ce{Cu(s)}$ container, would any reaction occur? Lead(II) ions will not react spontaneously with the copper solid as the $E^0_\mathrm{net}$ of the reaction ...
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38 views

Which component decides what my pH will be in an aqeous solution?

I have an aqueous ammonium cinnamate solution of 0.5 M and want to know how I can calculate the pH of this solution. It is unclear to me which of the two components will have the upper hand as they ...
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2answers
52 views

How can I keep homemade laundry detergent from disassociating?

We've been using this recipe http://goo.gl/MjNQ3s to make laundry detergent. Works fine, but after a few days it disassociates into a clear bottom layer and a pink top layer. It's mildly annoying ...
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1answer
29 views

Solubility of silver acetate in the presence of nitric acid

What will be the effect on the solubility of $0.1\ \mathrm{mol}$ of $\ce{CH3COOAg}$ in presence of $1\ \mathrm{l}$ of $0.1~\mathrm{M}\ \ce{HNO3}$ solution? $$K_\mathrm{sp} (\ce{CH3COOAg}) = 10^{-...
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1answer
118 views

How does chromium(III) react to form chromium(VI) with hydrogen peroxide?

$$\ce{2Cr(OH)3 + 4NaOH + 3H2O2 -> 2Na2CrO4 + 8H2O}$$ How does this reaction occur? We suddenly get sodium chromate in the place of chromium hydroxide. I can't understand it. We mix two hydroxides ...
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1answer
42 views

How can you infer that density decreases when ice melts from the water phase diagram?

I know the phase diagram shows negative slope for water which is an exceptional case... But how do you read that graph and get to the conclusion that density is increasing? It's the one with ...
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28 views

When are Atoms Considered Ions [duplicate]

When are atoms considered ions? For example, $\ce{NaCl}$ is obviously an ionic compound as it made up of $\ce{Na+}$ and $\ce{Cl-}$. But in compounds which have covalent bonds such as water, is it ...
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2answers
113 views

Is H+ (in an aqueous solution) = H3O+? [duplicate]

I was learning about autoionization in science and my science teacher wrote $\ce{H3O+}$ as $\ce{H+}$ — now, my intuition would lead me to assume that: $$\ce{H3O+} = \ce{H+}$$ But, $\ce{H+}$ is just ...
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2answers
133 views

Can silver metal be used to electrochemically reduce copper?

I have a solution of copper(II) ions and several cations. I am trying to reduce the copper ions to copper metal with electricity. My Ideas was to use silver as the anode and a copper wire as the ...
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1answer
159 views

How is NaOH able to clear a solution of Paraformaldehyde?

While making a solution of $4~\%$ para-formaldehyde for immunohistochemistry (to fix the tissue), we add para-formaldehyde into water and stir. It looks like a chalky supersaturated solution even ...
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21 views

What is the standard enthalpy change of solution of ethanol?

I was checking up on this data, and it greatly surprised me that no data tables or sources cite a value for this, as it is exceedingly common to mix ethanol and water. I suspect that it is quite ...
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1answer
11 views

How can a conductivity experiment have higher voltage than battery?

I did an experiment where I tested the conductivity of different solutions and some substances. We connected a 9 bolt battery, some aluminum foil sticks, and a multimeter that reads the voltage. It ...
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38 views

Extrapolating Properties for Water-Miscible Solutions

I am working with a chemical which has the following properties: The chemical is water-miscible The chemical contains ingredients which have a flashpoint of 200F The chemical is ~80% water (the ...
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1answer
154 views

Is the concentration of negative ions always equal to that of positive ions?

Is there any way in which a solution can have more negative charge than positive charge, or vice versa? For example, in the context of acid-base chemistry, is there any scenario in which $[\ce{H+}]\ne[...
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1answer
26 views

Why is the boiling point of rectified spirit lower than alcohol absolute?

The boiling point of rectified spirit is ($78.1~\mathrm{^\circ C}$) while that of absolute alcohol is ($78.3~\mathrm{^\circ C}$). I know its too small, but shouldn't the addition of impurities ...
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1answer
22 views

Chondroitin Sulfate (greater volume in solution than in crystal form)

I've read in a textbook on biophysics that chondroitin sulfate occupies a greater volume in a solution than in crystalline form. Why is that? Is it because of hydrogen bonds in solution that the ...
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0answers
36 views

Why are Alkali Metal Ions Soluble?

I think the question needs no elaboration. Why are salts containing Group 1A cations extremely soluble in water? I speculate that the reason involves the low charge density of those ions in a given ...
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1answer
42 views

Chemical desalination

Is there a way to remove salt from water, even just partially, using chemical or filtration methods prior to a reverse osmosis? The problems is that salt is very hard on a reverse osmosis membrane ...
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2answers
63 views

Problem dissolving iron in HCl

I was trying to dissolve iron metal in HCl to make iron chloride, but ran into some problems. I'll give a brief background of my experiment. I took iron nails and put them in a container filled with ...
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1answer
73 views

Vapor pressure of immiscible liquids

I have read that vapour pressure of a mixture of two immiscible liquids is $$P=P^0_A + P^0_B$$ where A and B are immiscible liquids. My question is, if they are immiscible, they would form separate ...
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1answer
17 views

Detection of NaF levels in aqueous solution also containing NaCl

Is it possible to determine the concentration of sodium fluoride, more specifically fluoride ions, in a solution that also contains sodium chloride? I have looked into using an ion-specific electrode, ...
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1answer
88 views

What is the colour of chromium(III) chloride solution?

I had a question asking about the colour of the solution of chromium(III) chloride in my exam, all my colleagues have different answers, I couldn't find any exact answer after searching!
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1answer
40 views

Why don't we take into account the auto-protonation of water when measuring its concentration?

When we calculate the concentration of water at $ 25~^\circ\rm C $, why don't we assume dissociation of water at this temperature? $$\ce{H2O <=> H+ + OH-}$$
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31 views

Rate of Evaporation of solution

Why does rate of evaporation of solution decreases on adding a non volatile component? Also what happens if we add a volatile solute?
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1answer
27 views

Can aluminium be split into Al 3+ and OH-?

When writing a net ionic equation containing aluminum hydroxide, can the aluminum hydroxide be split into ions of $\ce{Al^3+}$ and $\ce{OH-}$, or does it stay as $\ce{Al(OH)3}$?
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30 views

What makes the double displacement reaction:CaZ + 2 NaCl = Na2Z + CaCl2 (Z is zeolite) possible?

$\ce{CaZ + 2 NaCl -> Na2Z + CaCl2}$, where Z stands for zeolite. This is the reaction which generally occurs under removal of hardness of water during a process called Permutit or Ions exchange ...
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2answers
37 views

Why is iron(II) fluoride thermodynamically favorable when dissolved in acid?

I am reviewing for the AP Chemistry test, and the question is this $$ \ce{FeF2(s) <=> Fe^2+(aq) + 2F^- (aq) } \quad K_1 = 2\times 10^{-6} $$ $$ \ce{F- (aq) + H+ (aq) <=> HF(aq)} \quad ...
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1answer
31 views

Charge, Size, and Movement in Aqeuous Ions as Electrolytes

Would a pair of aqueous $+2$ and $-2$ ions necessarily conduct electricity better than the same concentration of $+1$ and $-1$ ions? Furthermore, would more massive ions not conduct as well as less ...
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1answer
100 views

What will be the reaction between tin (II) chloride and copper (II) chloride?

I just tried conducting an experiment during lunch today. Now, I calculated this reaction 4 days ago dealing with electrochemistry, $$\ce{SnCl2 + CuCl2 -> Cu(s) + SnCl4}$$ Theoretically, I got ...
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3answers
57 views

w/w % to molarity

After reading a number of explanations about it after googling, I'm a bit confused on this. Some explanations are doing it using a solution density, others aren't, though most are. On one site it's ...
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27 views

Special effects: using non-toxic solutions to create colors

I'm looking for a non-toxic solution to create low budget special effects without using digital effects. An actor ($175\: \mathrm{cm}$ tall) could: wear a particular kind of clothing? be coated ...
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1answer
47 views

How to filter out magnesium acetate (a soluble salt) quickly and cheaply from water

I am conducting an experiment that involves reacting a weak acid and a weak base to form water and a salt with this overall equation $$\ce{Mg(OH)2(s) + 2CH3COOH(l) <=> 2H2O(l) + Mg(CH3COO)2(aq)}...
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1answer
216 views

Do you include the “10 H2O” in the formula for borax?

When you calculate the mass of borax needed to make up a standard solution, do you include $\ce{\cdot 10 H2O}$ in the formula for borax? Why or why not?
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39 views

Hydronium Salts

When it comes to solids, hydroxide salts are quite abundant. There is $\ce{Mg(OH)_2}$, $\ce{NaOH}$, $\ce{CsOH}$, $\ce{Ca(OH)_2}$, and $\ce{Fe(OH)_3}$, just to name a few. However, (correct me if I'm ...
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1answer
48 views

Freezing Point Depression Problem

Assuming an ideal solution, which of these 0.10 M solutions would have the least freezing point depression? $\ce{HCl}$ $\ce{NaBr}$ $\ce{KNO_3}$ $\ce{MgSO_4}$ They all produce ...
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1answer
33 views

What solutes will give the largest reduction in volume when dissolved in water

This question is inspired by another question. If you take some common salt (NaCl) and some water and mix them, then the volume of the solution is less than the volume of the constituents. I did ...
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1answer
52 views

Unique Solubility Expression for Sulfide Salts

While looking at aqeuous $\ce{K_{sp}}$ values in the back of my textbook, I noticed that there is a asterisk by all of the sulfide compounds (such as $\ce{HgS}$), and the asterisk says, "For a ...
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1answer
21 views

Mixing a Tagged Sample of Lead Iodide with another Iodide Salt [closed]

A sample of sparingly soluble $\ce{PbI_2{(s)}}$ containing radioactive $\ce{^{133}I}$ is added to 0.10 M $\ce{KI_{(aq)}}$ and stirred overnight, what happens? I The radioactivity of the liquid phase ...
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1answer
52 views

What actually happens when citric acid is added to a highly alkaline soap solution?

A few days ago I made an experiment. I diluted a few small chunks of bar soap with 20 ml of water. I then measured the ph of the solution which was around 10. I then added a tiny amount of citric acid....
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2answers
43 views

Can one predict the entropy change for aqueous phase reactions without calculation?

I have seen several sources that claim aqueous solutions always have more entropy than pure liquids or solids, however, some aqueous ions have negative standard entropy. This opens the possibility of ...
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86 views

What does solubility limit mean in practical terms?

I am not really a chemist guy so please bear with me. Glycerol monolaurate has an upper limit of solubility in water of 20 μg/mL, which is enough for my experiment. Does this mean that no matter how ...
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Poor aqueous solubility of chloroazodin

Below is the structure of chloroazodin: Why is chloroazodin poorly soluble in water? It has multiple amine and imine nitrogens, all of which appear to be available for hydrogen bonding, and thus it ...
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3answers
239 views

What is the compound called when it is in solution?

When a compound precipitates out of solution, for example Calcium Carbonate from a water solution, it is called the precipitate. What is the same compound called before it precipitates out - once it ...
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Will bases typically precipitate silver atoms from silver ions?

In class I learnt that one can dissolve many substances using acid and that this can be predicted using standard electrode potentials. For example, $$\begin{align} \ce{Zn &-> Zn^{2+} + 2e^-} ...
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Why does adding PBS to a lipid+propylene glycol solution cause the lipid to precipitate?

I am trying to create an aqueous phospholipid suspension using ~50 mg of 1,2-dibehenoyl-sn-glycero-3-phosphocholine (DBPC), 13 mL of propylene glycol (PG), and 72 mL of phosphate-buffered saline (PBS)....
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26 views

Gas solubility in water and alcohol

I know that a certain gas is soluble in water but not in alcohol. How can I find the solubility of the gas in mixture of water and alcohol? Do I use a simple linear relation? The gas in question is ...
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1answer
66 views

Trying to displace iron from ferrous sulphate heptahydrate using aluminium foil but nothing has happened

I started by dissolving the sulphate into water and filtering it as I noticed there was a dirty residue lying at the bottom. (I am using ferrous sulphate that is commonly used in gardening.) I then ...