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

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How can I best achieve a stable solution of Pt-Nanowires in water

I am synthesizing platinum nanowires ($50nm×20\mu m$) in aqueous solution. Unfortunately they start to aggregate rapidly, which is not desired. How can I keep them dispersed?
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ion-exchange water filters TDS PPM [on hold]

Ion-exchange jug filters for home water use exchange ions. For example, they remove calcium and replace it with sodium, they replace magnesium with potassium, and so on. So the filtered water ...
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1answer
38 views

What does K3Fe(CN)6 become?

I have a question. K3Fe(CN)6 what does this change to when it is in water? I mean, i think its going to ionize, but in what way? Is there a way to know this? I tried to search the web but, never got ...
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1answer
16 views

Equilibrium Question Kc [closed]

The equilibrium constant for dissolving the insoluble substance gold (I) iodide, AuI (s), in aqueous solution is 1.6 × 10^-23 at 25ºC. Write the equilibrium constant expression and calculate the ...
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26 views

Ferric Chloride solution weight

When I notice that ferric chloride is sold as 40% solution w/v, does it mean weight / volume? Is it a matter of for example adding 40g of ferric chloride crystals to a water solution where the total ...
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1answer
76 views

Why does the composition of Ocean Water list sodium and chloride separately?

This is the site I am using. It is also found here, but this uses mg/L instead of percents. It lists Sodium at 30.8%, and Chloride at 55.3%. How can this be? Shouldn't the two be listed as Sodium ...
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1answer
34 views

Melting point of ocean salt: eutectic?

I'm interested in the melting point of ocean salt. While sodium chloride has a melting point of 801 °C, ocean salt contains 15 % other ions, mainly sulphate, magnesium, calcium and potassium (the ...
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59 views

Find the volume of sea water

The concentration of all salts present in sea-water is 3.52 % (m/v). Calculate the volume of sea-water, which on evaporation will produce 5 kg of salt. My attempt: \begin{align} 5~\mathrm{kg} &= ...
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27 views

Do I need to include calcium chloride in this reaction equation?

Yesterday I titrated a solution of calcium hydroxide in aqueous calcium chloride with $16.7~\mathrm{mL}$ of $\ce{HCl}$. More specifically, I took $25\ \mathrm{mL}$ of the calcium hydroxide in aq ...
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24 views

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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17 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
61 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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152 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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0answers
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
58 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
33 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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124 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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30 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
115 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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141 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
176 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
15 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
159 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
30 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
23 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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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
83 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
80 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
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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
101 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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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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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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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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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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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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32 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
113 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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90 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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28 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
50 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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220 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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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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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
35 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
54 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
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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 ...