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

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Water exchange at Al (III)

Why is the rate of water exchange at Al(III) centres so slow ? According to this medical book (p.5) it is $10^{5}$ times faster at Mg(II).
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1answer
43 views

Water reacts or doesn't react?

I know that when you have $\ce{HCl}$, $\ce{H2O}$, and $\ce{NaOH}$ that you produce $\ce{H2O}$ and $\ce{NaCl}$. However some people say water does react and so would think that this 2 step reaction is ...
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0answers
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Measuring Colloidal copper PPM & how to ignore the salt PPM in soluton

I made some colloidal copper with 9V battery. To make this water I had to add small amount of salt. However, the salt itself shows up in PPM count of my PPM reader. So how can I discount the salt PPM ...
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1answer
21 views

Purification of water with ferric chloride

Ferric chloride ($\ce{FeCl3}$) is a chemical used in water treatment. If ferric chloride is added to a water sample containing calcium bicarbonate, would the $\mathrm{pH}$ of the solution decrease or ...
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2answers
26 views

Identifying MgCl2 or CaCl2 in solution

I have an aqueous solution of either $\ce{MgCl2}$ or $\ce{CaCl2}$ in solution with $\ce{K2SO4}$. There is a white precipitate that forms on the bottom that does not dissolve when $\ce{HCl}$ is added ...
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37 views

Solubility of different compounds?

I am the typical student that is very bad in organic chemistry. I understand that some of you might find my question trivial and would instruct me to go google up my answers instead. I have tried ...
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1answer
44 views

Reaction of sulfate ion in copper sulfate electrolysis

I am planning to try copper plating a piece of metal by performing electrolysis on an aqueous solution of copper sulfate. I plan run an electrical current with the metal I want to plate as the cathode ...
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3answers
258 views

Differentiation between Zn(2+), Al(3+), Mg(2+) in solution

If I have three aqueous ionic solutions in which I know that the cation is $\ce{Al^3+}$, $\ce{Mg^2+}$, or $\ce{Zn^2+}$, and that how do I find out which is which? I was thinking to add $\ce{OH-}$ in ...
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1answer
26 views

How to dissolve composite In2O3 with SnO2 without affecting stainless steel?

I found this article, but it was not helpful. The $\ce{In2O3}$ is probably amorphous. $\ce{HNO3}$ and $\ce{HCl}$ do not work. Any ideas?
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0answers
24 views

Reference request for the number of solvents around a solute

I want to know if there is a way to find number of solvent molecules that are directly embracing a solute molecule ( something like a reference or table that shows waters of hydration ). Particularly ...
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1answer
63 views

Finding Cation of Unknown Salt in Solution from Precipitate

I should probably add that I was originally given an unknown solid mixture of 2 salts. I separated the insoluble salt out by centrifuging and then decanting. I found that the insoluble salt is ...
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1answer
19 views

Water softener and RO filter

I have a water softener for showers and dishwasher and a reverse osmosis filter for drinking water. For convenience of the install, the RO filter is using softened water (some calcium carbonate has ...
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4answers
92 views

What an aqueous solution really contains?

I want to know what an aqueous solution is. For example, let's consider a $1~\mathrm{M}$ aqueous solution of $\ce{MgCl2}$. Does it also contain $\ce{MgOH2}$? Though it is a simple question, I feel it ...
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1answer
215 views

When I place a straw in carbontated drink and blow, more gas bubbles rise to the surface?

When I place a straw in carbontated drink and blow (making bubbling noises), more gas bubbles rise to the surface. The gas bubbles which rise to the surface are from the carbon dioxide gas dissolved ...
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0answers
37 views

What would happen if I mix salt and sugar in a cup of water? [duplicate]

If I mix water in a cup with sugar at some stage the solution will become saturated and no more sugar will dissolve into the water. If I now add salt to the solution will the salt dissolve into the ...
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1answer
63 views

Saturation of multiple solutes

Can a liquid which is saturated with a single solute, dissolve a different solute, or is saturation a universal thing? I ask because I've seen that different solutes have different points (amounts) at ...
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1answer
47 views

Buffer calculation

Problem: A buffer was made by mixing 500 mL of 1 M (mol/L) acetic acid and 500 mL of 0.5 M calcium acetate. What are the resulting concentrations of acetic acid (henceforth called ...
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2answers
74 views

How to determine which salt will precipitate from a solution containing multiple ions?

I have a solution containing $0.2\:\mathrm{mol}$ of $\ce{Br^-}$ ions and $\ce{SO_4^2-}$ ions each. Now if I add excess $\ce{AgNO3}$ in this solution, what will precipitate? $\ce{Ag2SO4}$ or ...
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1answer
50 views

Buffer solution calculation

Preface: Buffer solution (acid-base buffer). I am provided with a weak base, which I will designate B. pKa for B's conjugate acid--which I will designate BH--is 8.1, and its mole weight (sic) is ...
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1answer
30 views

Cohesive Energy Density table request

Quick question: Any one knows a resource for Cohesive Energy Density of some organic materials ? I am not looking for any specific molecule, actually I want to plan my project based on available ...
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1answer
56 views

Balancing Redox Equations - Half Reactions

How do I balance this using the half-reaction method: $$\ce{Zn(s) + HCl(aq) -> Zn^{2+} (aq) + H_2 (g)}$$ I would first split it up in its ionic components: $\ce{Zn(s) + H^+ + Cl^- -> Zn^{2+} ...
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1answer
60 views

Effect of dilution on pH for HCl

Is it necessary to consider common ion effect when suppose a strong acid like HCl is added to water? For example in this question: 10 mL of $10^{-6 } \ce{mol/L \ HCl}$ solution is mixed with 90 mL of ...
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1answer
48 views

How to remove nitrate from water sample?

Are there any simple methods to completely remove nitrate ions from few ml of impure water sample ? One method I am curious about is the following process : Add one or more reagents to water in ...
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1answer
56 views

Is an acid a liquid or an aqueous solution? [closed]

I am tying to determine if an acid is a liquid or aqueous solution? Please can some one enlighten me?
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2answers
54 views

Double Replacement Reactions form Precipitates

Why do most all double replacement reactions result in a precipitate and an aqueous molecule? Is it because the individual solute molecules always form stronger bonds such as how in single replacement ...
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1answer
82 views

'Emulating' calcium hydroxide

I posed this question at the Seasoned Advice SE and thought I might get some more information here. Traditionally prepared corn is cooked in a calcium hydroxide solution to make it more digestible, ...
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0answers
22 views

Strong and weak bases? [duplicate]

I have read that a strong base fully dissociates in aqueous solution to form hydroxide ions, and therefore that strong bases are alkalis. I was wondering if you can have a strong base that is not an ...
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2answers
52 views

Confused about strong/weak dibasic and tribasic acids?

I know that sulfuric acid is considered a strong acid, and the dissociation of its first H+ ion is complete and of its second H+ ion is partial. Phosphoric acid is weak and all three of its H+ ions ...
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2answers
91 views

Why do exam questions specify “dilute acid”?

All of the exams that I've sat so far, and the homework questions I've had, always ask for the reaction between a substance and a dilute acid. Is there a difference in the reaction between a dilute ...
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1answer
79 views

Weak base titrated with a strong acid

If you have a weak base XOH titrated with a strong monotonic acid, where do you start with that? Would you first have the base react with water and break up and determine how much of it does? Or just ...
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1answer
34 views

Changing solubility of metal complex by adding ethanol

After creating a solution of copper(II)-sulfate-pentahydrate, water and concentrated ammonia, the newly formed complex (tetraamminecopper(II)-sulfate-monohydrate) is completely dissolved in water. By ...
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2answers
89 views

What is the maximum molarity of aqueous HCl?

Here is a problem a made up: We have some aqueous $HCl$. What is the maximum possible molarity of the HCl? How do I solve this? I don't have any good ideas.
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1answer
50 views

Solid AgCl placed in 1 L of 0.55 M NaCl - find mass AgCl dissolved

A problem in my textbook: Solid $\ce{AgCl}$ is placed in $1\,\mathrm{L}$ of $0.55\,\mathrm{M}$ $\ce{NaCl}$. Find the mass of $\ce{AgCl}$ which dissolves. I know the method to solve the problem. ...
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1answer
37 views

Ionic equilibrium equation [closed]

What form is the ionic equalibrium equation? I have problem asking for it, but I'be done so many different equalibrium equations that I'm starting to get mixed up on which one is called what... Which ...
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1answer
31 views

Ionize Hydrogen and Oxygen Gas in Electrolytic Cell?

As is well known, water can be electrolyzed into oxygen and hydrogen gasses. However, all redox reactions can be run in reverse. If I were to electrolyze water in 2 closed containers (in order to trap ...
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2answers
48 views

Diluting down solutions method

I'm designing an experiment and it involves testing various concentrations of solutions, and I will be testing 5 in total. I proposed to make up a stock solution, and distribute it evenly in 5 ...
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5answers
383 views

What gas is released during dissolving NaOH

What gas is released during dissolving solid $\ce{NaOH}$ in a high purity water? Water more than 10 M$\Omega$/cm and standard quality $\ce{NaOH}$.
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1answer
95 views

How do you find the pH of a solution from a density and weight percentage? [closed]

An $\ce{HCl}$ solution of density $\mathrm{1.19~g~ml^{-1}}$ has weight percentage of 38%. Find it's pH. Since there is no given volume I assume there is no way to solve this?
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0answers
31 views

A chemical that would react with sodium polyacrylate? [closed]

If clothing contained sodium polyacrylate, what chemical could be introduced to dissolved the clothing? If possible, not to be affected if water is present as well.
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0answers
62 views

Calculating the Molarity of an Ion?

I'm completely stuck on this one - I was doing an experiment in a lab and now I cannot find the molarity of an ion in a solution. I've looked everywhere on the web but after 2 hours of searching I ...
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2answers
88 views

Carbonic acid-hydrogencarbonate buffer system pH calculation?

I am learning about the pH of buffer solutions, and am slightly confused by my text book's calculation. For the blood's buffer system of carbonic acid and hydrogencarbonate ions as the conjugate case, ...
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1answer
31 views

Is sodium hypochlorite solution an ionic solution - does it conduct current?

Does an aqueous solution of sodium hypochlorite conduct current?
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0answers
15 views

What is the heat of dissolution of sodium acetate trihydate?

Is the reaction endothermic since its crystallization is exothermic?
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1answer
32 views

Boiling aluminum in high-alkalinity water

This question ultimately relates to brewing beer, but more specifically to water treatment before brewing. Though I can't get a water quality report, I suspect I have high levels of bicarbonate ...
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0answers
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Weighted Drilling Fluid Comparison with CaCl₂

I asked a question previously, and the answer was quite illuminating. The answer ushered me forth in a direction that finally made sense. I ended up finding this website, ...
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0answers
71 views

How to measure the enthalpy change of hydration?

I am learning about lattice enthalpies, and my text book talks about determining the lattice enthalpy from the standard enthalpy change of solution and the enthalpy change of hydration of the ions, ...
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1answer
40 views

Why don't water molecules react alongside aqueous reactions?

To explain my question I'll use an example: We all know that sodium displaces copper in a solution of its sulfate in the reaction: $$\ce{2Na (s) + CuSO4 (aq) \rightarrow Na2SO4 (aq) + Cu (s)}$$ My ...
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2answers
117 views

Methylene blue used as funguscide in cichlid reproduction - concentration measurement?

I have an aqueous solution of methylene blue. How do I determine the concentration of this solution, so I can duplicate it?
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1answer
46 views

How to convert sodium aluminate back to sodium hydroxide?

I had dissolved a bunch of aluminium foil in an aqeous solution of sodium hydroxide. The resulting solution consists mainly of sodium aluminate with very little excess sodium hydroxide. What I want to ...
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2answers
149 views

Can artificial sea water be prepared by mixing sea salt with water?

I am looking for ways to easily prepare artificial sea water. The chemical composition doesn't have to exactly match that of natural sea water. On-line I can find recipes to prepare sea water. But I ...