Questions tagged [precipitation]
For questions related to the chemical reactions and processes that result in a chemical reaching its solid phase.
177
questions
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How do I separate an Indium-Gallium alloy into Indium and Gallium?
I've recently learned more about Indium and Gallium, and I find them quite interesting, especially how an alloy can be manually made simply by rubbing them together. I'm curious though, is there a ...
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2answers
48 views
Precipitation of equimolar amounts of chloride and bromide [duplicate]
I was just wondering about the following situation; if we had a solution containing 0.1M bromide and 0.1M chloride ions, and treated it with excess silver nitrate, what would happen and would ...
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34 views
Converting dissolved chromates to solids for disposal
I have 4 liters of electrolysis waste that was used to process stainless steel cathodes.
About half of it was oxalic acid based and the other half was sodium bicarbonate based (currently stored ...
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38 views
Does Sodium Precipitate with anything to find the level when titrating?
I am trying to find sodium in animal feeds. I already have a procedure to find chloride by using Mercuric Nitrate to form Mercuric Chloride using a titration method but am having a difficult time ...
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1answer
35 views
How to determine whether a solid has dissolved or no reaction occurred? [closed]
From this link: https://chemhaven.org/che111/lab/Lab_9_Unknown_Anion_F21.pdf
When dissolving a solid or precipitate,
only a portion is dissolved, thus leaving some behind, and fooling a student into ...
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2answers
109 views
Are there any cold temperature reactions in liquid where ice forms as a precipitate?
The title asks the entire question, but I'll elaborate:
Precipitates form in aqueous reactions when some product is insoluble in water. Is there a reaction in some other solvent where solid water ...
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1answer
25 views
The meaning of USFDA (in cosmetics) [closed]
The full meaning of USFDA base on the definition of cosmetic meaning and production
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1answer
135 views
Is BaSO4 (barium sulphate) soluble or insoluble in diluted HNO3 (nitric acid) and diluted HCl (hydrochloric acid)? [closed]
Here's the original question , I was asked in an exam :
Edit : the question in the picture is a single correct multiple choice question
I have concluded the the reaction of Barium chloride and Sodium ...
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1answer
45 views
Displacement of salts due to higher solubility
I was wondering why mixtures of salts in the same solution precipitate excactly in order of their solubilities. Imagine a solution with NaCl, NaBr, NaI in equal moles. If AgNO₃ solution is now added ...
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1answer
80 views
How to predict colour of precipitate? [duplicate]
I am currently preparing for Junior science competitions and I am coming across many questions where colour of precipitate plays important role... Like
When compound $\ce{Hg2(NO3)2}$ reacts with $\ce{...
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1answer
116 views
Why use "molecular equation" to refer to a chemical equation describing a precipitation reaction?
When we describe a precipitation reaction using a chemical equation, we have the choice of either writing the net ionic equation (i.e. leaving out spectator ions) or writing the respective ionic ...
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59 views
Why does the reaction between copper(II) ion and iodide ion proceed even though the E_cell of the set up is negative?
(iii) Another example of a reaction that does not agree with the theoretical prediction is the reaction between $\mathrm{Cu}^{2+}$ and $\mathrm{I}^{-}$ according to the equation below.
$$
2 \mathrm{Cu}...
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Can two two-material composite precipitation methods be used to make one three-material composite?
There are many methods used in the synthesis of cellulose nanocomposites, including Fe₃O₄@Cellulose in urea, ammonia, and water solution and immersing the product in sulfuric acid, or somewhat ...
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73 views
How do I get calcium citrate to precipitate in experiment on extraction of citric acid from juice?
I was planning to extract citric acid from mango juice by first using Aspergillus niger fungus by fermentation to convert the mango juice to citric acid, then extracting by first adding sodium ...
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2answers
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Ambiguity in the direction of dissolution equilibrium
The following reaction is usually carried out to test for the carbonate anion in an inorganic salt;
$$\ce{CO3^2- +BaCl2/CaCl2 -> BaCO3/CaCO3(s) + 2 Cl-}$$
The resulting carbonate is stated to be an ...
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Identification of salts observed in steam vaporiser
Recently I observed some precipitated salts in steam vaporizer after completion of vaporization.
I am guessing that some of the white particles may be calcium carbonate ($\ce {CaCO3}$) formed from ...
2
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1answer
51 views
Iron-II to iron-III change in complex formation
We have an iron dust sample, which is treated with hydrogen chloride in aqueous solution. The solution enters in a reaction with a sodium hydroxide powder, from which we obtain a precipitate. Could we ...
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28 views
Why is the Ag+ concentration in a beaker fixed in the reaction between excess AgCl (s) and KI (aq) from the start? [duplicate]
This arises as a sub-question for the following question: Calculate the concentration of I- in a solution obtained by mixing 0.10 M KI with an excess of AgCl(s).
I tried to look at How does addition ...
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48 views
Adding aluminum sulfate to neutralize an aqueous solution of sodium silicate with pH of 12.6
How much aluminum sulfate do I need to add to an aqueous solution of sodium silicate to neutralize the solution (pH from 12.6 to 7)?
For a water treatment school project, we remove sodium silicate ...
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63 views
Why is hydrated barium peroxide used in the preparation of hydrogen peroxide?
I read about the laboratory method of producing hydrogen peroxide. The chemical reaction in question is: $$\text{BaO}_2.8\text{H}_2\text{O} + \text{H}_2\text{SO}_4 \rightarrow \text{BaSO}_4+\text{H}_2\...
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1answer
297 views
Si(OH)4 vs. H4SiO4 vs. SiO2.2H2O
Can someone please explain to me what is the differences between $\ce{Si(OH)4}$, $\ce{H4SiO4}$, and $\ce{SiO2.2H2O}$? I am currently studying sandstone acidizing geochemical models and this question ...
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158 views
Can I extract solid sugar from any fruit juice at home?
The goal here is to isolate the sugar from all other compounds in the juice. In this case, I'm using apple juice and grape juice. The sugar does not need to be edible, as it is being used to make r-...
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1answer
68 views
Precipitation of a lead(II) sulfate
Lead (II) sulfate precipitate can be dissolved if:
a) We add an acid
b) We add EDTA
c) None of the above is true.
I think EDTA is a ligand, and if you want to dissolve the sulfate, then Pb sticks ...
3
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2answers
143 views
Why do reusable heat packs have a limited time frame before the reaction becomes irreversible?
I have two "rechargeable" heat packs which from my understanding operate on the phase change
$$ CH_3COONa_{(aq)} \rightleftharpoons CH_3COONa_{(s)} + \Delta H.$$
Triggering the ...
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3answers
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Can precipitation occur in states of matter other than liquids?
This answer to Are precipitation and crystallization both analogous between chemistry and meteorology? discusses the history and use of the term "precipitation" in chemistry.
From what I ...
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Are precipitation and crystallization both analogous between Chemistry and Meteorology?
A comment under the Space SE question Is there really precipitation on Mars? Does frost count? brings up the use of the term "precipitation" in chemistry and we wonder if precipitation in ...
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96 views
Reaction of Glucose + NaOH + PVP
I'm trying to synthesize of silver particles by using glucose as reducing agent, PVP as dispersant, and NaOH as pH control. Before adding silver nitrate solution, I've produced a solution which is ...
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3answers
68 views
A problem regarding solubility and concentration
A solution is $\pu{0.10 M}$ $\ce{Ba(NO3)2}$ and $\pu{0.10 M}$ $\ce{Sr(NO3)2}$. If solid $\ce{Na2CrO4}$ is added to the solution, what is the $\ce{[Ba+]}$ when $\ce{SrCrO4}$ begins to precipitate? $\...
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1answer
80 views
Co-precipitation particle size
If we are creating a precipitate of (say) Barium Sulfate from a solution of Barium Chloride mixed with Sodium Sulfate, what determines the particle size?
I assume one of the factors will be ...
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31 views
Solubility Product, and it's relation to solubility
In order to remove temporary hardness of water, it is boiled.
On boiling, while Ca(HCO3)2 gives CaCo3(ppt.) , Mg(HCO3)2 gives Mg(OH)2(ppt.).
According to my book precipitation of Mg(OH)2 occurs due to ...
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1answer
223 views
Why is the test for sodium as dihydrogen antimonate so specific?
I have been attending lectures of salt analysis in my college. We are at group 6 cations or also known as group zero cations, namely $\ce{NH4^+}$, $\ce{K^+}$, $\ce{Na^+}$, $\ce{Mg^2+}$.
The lecturer ...
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Material properties differing between vacuum or pressure filtration
During vacuum filtration of a very fine suspension, all solids that need to be removed are, but there is minimal solids loss. If the same material is pressure filtered (1-2 bar), desired solids ...
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2answers
74 views
Seperating out iron from ferrous sulfate
I don't need to necessarily seperate pure iron, but from a ferrous sulfate solution, I am trying to form a precipitate with iron. By getting a precipitation of an iron compound, I can find out the ...
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4answers
269 views
How many grams of sodium phosphate must be added to precipitate as much of one ion as possible?
Problem text:
Solid sodium phosphate is slowly added to $\pu{200 mL}$ of a solution containing $\pu{0.002 mol}$ of aluminum chloride and $\pu{0.001 mol}$ of calcium chloride (assuming no volume ...
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1answer
595 views
Using solubility product to determine the mass of the precipitate of a reaction
I mix together $\pu{100 mL}$ of an aqueous $\ce{NaCl}$ solution at $\pu{0.5 M}$ and $\pu{100 mL}$ of an aqueous $\ce{AgNO3}$ solution at $\pu{0.3 M}$. Assuming that the solubility of $\ce{NaCl}$ in ...
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53 views
Which salts precipitate from a potassium/sodium chloride/sulfate solution?
This is not a homework question. I am not in any course of study. The following question arises from my personal curiosity. If 1 mole of sodium sulfate and 2 moles of potassium chloride are dissolved ...
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132 views
Why does silver stick to the glass in Tollens' test? [duplicate]
Why does it not simply form a solid powder at the bottom of the flask?
Does silver also stick to the glass in other silver precipitating reactions?
EDIT:
My question is definitely not the same as ...
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1answer
81 views
Qualitative Analysis- Distinguishing between two ions or two salts [duplicate]
I know my question is going to be quite below the level of this site but I am 1st grade in university and I can't understand anything.
I am going to give an example from the book: distinguish ...
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2answers
155 views
How can I dissolve a precipitate when stuck to the side of a boiling flask
I’ve been experimenting with producing Iron Acetates and I’ve run into a snag. Here’s my process so far:
I started by adding white vinegar and ~50% Hydrogen Peroxide to a reaction vessel with steel ...
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1answer
37 views
Solutions and Precipitates [closed]
If a solution of $\pu{20mL}$ of $\pu{ 0.050M}~\ce{K+ }$is added to $\pu{80mL}$ of
$\pu{0.50M}\ce{ClO4-}$ will a precipitate form and what is the value of $Q_\mathrm{sp}$? For $\ce{KClO4}, K_\mathrm{...
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0answers
31 views
Will calcium concentrations be reduced when water is boiled at lower atmospheric pressure? [closed]
It's well documented that one can reduce calcium concentrations in water by boiling the water. This is caused by CO2 being driven out of the water and the calcium precipitating out of solution. Ok, ...
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282 views
DIY hand sanitiser solution forms spongy substance
I am trying to make my own hand sanitiser since it’s sold out everywhere. The formula I use is 1 part aloe vera gel in 2 parts 100% isopropyl alcohol. The problem is when mixing the two, the solution ...
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2answers
159 views
Remove carbon dioxide from solution [closed]
What solution could I add to a solution of water with dissolved carbon dioxide in order to get the carbon to precipitate out? I believe the ions are H+ and HCO3-
Thanks, Jerid
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Is the kinetic energy change of a system (q) equal to the enthalpy change of a system (∆H)?
When silver nitrate and hydrochloric acid are put together in a container, they form silver chloride. If you're given information about the reactants (including temperature change, heat capacity, and ...
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1answer
112 views
How to precipitate Chloroplatinic acid? [closed]
For the precipitation reaction, I have to react $\ce{H2PtCl6}$ with $\ce{(NH4)2CO3}$ while maintaining the $\ce{pH}$ in the range of 7-8 at 60 °C. But the problem is Chloroplatinic acid is not ...
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1answer
40 views
Effect of reduction potential on particle size of chemically precipitated silver particles [duplicate]
Is there no mathematical relationship between redox potential and particle size saying that an $X$ potential should yield a $Y$ particle size? Right now its general that large redox potential results ...
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1answer
35 views
Is there a name, or any specific jargon for a precipitation equilibrium involving a solid reactant?
Let's say you have some ions in solution, for example Na+(aq) and OH-(aq), and some partially dissolved solid, MgCO3(s), Mg+2(aq) and CO3-2(aq), which precipitates Mg(OH)2(s) until equilibrium.
So ...
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2answers
514 views
Will NaF + CaCO3 precipitate much CaF2?
If I mix sodium fluoride, calcium carbonate powder, and water, under what conditions (if any) would there be an equilibrium?
I.e. assume we start out with fully dissociated $\ce{Na+(aq) + F-(aq)}$, ...
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Ideal characterization technique to study behavior of heated metal nitrates
I have 3-4 metal nitrates as precursors for my coprecipitation reaction. I need to study the behavior of each individual nitrate and also of various combinations at 60 degrees Celsius, which is my ...
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Does brewing tea with hard water reduce the amount of bioavailable fluorine?
I read that brewed tea contains a relatively large concentration of Fluorine.
Fluorine can have negative health effects such as Skeletal Fluorosis. EDIT: I understand some Fluorine is necessary and ...
