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Questions tagged [solutions]

This tag should be applied to questions dealing with solutions of any kind. A solution is a liquid or solid phase containing more than one substance where, for convenience, one (or more) substance(s) called the solvent is treated differently from the other substances, which are called solutes. If water is the solvent, then the more appropriate 'aqueous-solution' tag should (also) be specified.

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How to find the molarity of Fe(NO3)3 in a stock solution made from multiple solutions [on hold]

A stock solution will be prepared by mixing the following chemicals together: 3.0 mL of 0.00200 M KSCN 10.0 mL of 0.200 M Fe(NO3)3 17.0 mL of 0.5 M HNO3 Determine the molar concentration of Fe(NO3)3 ...
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0answers
6 views

Is Dilition formula can be used to make given solution more concentrated? [on hold]

Removing the 2nd volume obtained by evaporation or adding more moles of solute,dilution furmula will be apllicable...
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2answers
21 views

Binding aqueous solution and oil solution without an emulsion

I am trying to solve this mystery...There is this company called 100% pure who makes lipsticks using fruit extracts as their pigments in their formulations. Fruits pigments are water soluble - so, the ...
-1
votes
0answers
12 views

To find out how much urea will separate out? [on hold]

I know how to solve the above question I will let water used be 'w' gm and then will apply the formula of decrease in free zing point and then calculate 'w' then it would be subtracted from 250 gm . ...
8
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4answers
840 views

Ionic compound having highest solubility in water

Which ionic compound has highest solubility in water? I can find CsBr having highest solubility with 1230 g/L at 25 °C. Note: compounds like ethanol are soluble to any extent in water, but they are ...
1
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1answer
23 views

Why do you use acetic acid instead of water to create your standard riboflavin solutions?

I must create my own lab and I was going to use water, however, a similar experiment online says that acetic acid should be used to create my standard riboflavin (vitamin B2) solutions. Why is that?
3
votes
1answer
37 views

Relation between freezing point depression and vapor pressure

My lab manual defines the freezing point as "The temperature at which the vapor pressure of the substance in its liquid phase is equal to its vapor pressure in the solid phase." It goes on to explain ...
2
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2answers
38 views

What explains the stark white colour of my iodometric titration analyte solution?

During my Advanced Higher (secondary school) investigation, I reacted pure copper with concentrated nitric acid to acquire a copper nitrate solution. This was neutralised with excess sodium carbonate ...
1
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0answers
31 views

Is awaruite to nickel sulfate possible?

Much time has passed since my basic chemistry and I am trying to determine if an awaruite mine proposed by FPX Nickel Corp ("FPX") might serve as feed-stock to nickel sulfate for battery production. ...
1
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0answers
24 views

How to make rheoscopic fluid using glycol stearate flakes

Rheoscopic fluid can be made by adding mica powder to water. I read that mica powder can settle and condense after sitting around for a long time. So I want to use glycol stearate flakes instead. ...
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votes
2answers
82 views

Doesn't Ostwald's law of dilution contradict Le Chatelier's principle?

By Le Chatelier's principle, increasing the concentration of a weak electrolyte brings out more ions. By Ostwald's dilution law, increasing the concentration of a weak electrolyte brings out less ...
0
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1answer
17 views

Suitable safe cleaning solution for aliphatic urethane

I am looking for a suitable cleaning solution for a sprayed on coating that is an acrylic aliphatic urethane. My end goal would ideally be something that can neutralize rust, whiten and brighten the ...
0
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0answers
26 views

Adding Heat to food

So, I am trying to use Pure Caspsaicin to add a little heat to some food. Now the pure Caspsaicin has come in crystal form they are Lipophilic so I have to use Glycerin to dilute it. Now my issue. ...
1
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0answers
16 views

Dependence of Osmotic Effects on Particle Size

van't Hof's equation for osmotic pressure is derived with the assumption, among others, that the particle size of the solute is comparable to the particles size of the solvent. It holds well so long ...
1
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1answer
19 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 ?
2
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0answers
46 views

Why does LDA solution gradually turn dark brown?

LDA (lithium diisopropylamide) solution in THF/hexane gradually turns red-brown liquid. Especially commercially available one is extremely dark red-brown. What makes it brown? I've searched online ...
0
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1answer
20 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 ?
0
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1answer
37 views

How can iodized oil be made?

I want to combine solid elemental iodine with olive oil, to form an iodized oil - what is called an iodostearic acid or iodooctadecanoic acid, here the double bond in the oil becomes saturated by ...
2
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0answers
40 views

Is there a single word antonym for dissociate? [closed]

Teaching ionic and covalent compounds, and one of the differences is that some ionic compounds will dissociate when dissolved but covalent compounds usually do not (salt water vs. sugar water, just ...
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2answers
38 views

Simple question about mixing two electrolytes [closed]

Suppose we have two 0.1M solutions in water. What is their conductivity and how will it change when we mix them, and why? A) NaCl and KCl: Okay, so both are strong electrolytes and conduct well but ...
1
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1answer
25 views

Fishes and Heater

I had an aquarium for about an year and this week my mum just installed a heater in it. On asking, she told me that fishes would die in cold water. But from Henry's Law, isn't it that more oxygen ...
1
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4answers
150 views

How to get a precise answer to a textbook precipitation problem?

This question concerns a textbook problem* on precipitation. Briefly, there are $2\cdot10^{-4}$ of Mn$^{2+}$ and Cu$^{2+}$ ions in a liter of solution with $0.003$ M HClO$_4$. This solution is then ...
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1answer
28 views

Calculate the final molarity from 2 solutions [closed]

How do I calculate the final molarity when 70.0 mL of 3.0 M sodium chloride solution is added to 30.0 mL of a 1.00 M solution of sodium chloride>
0
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1answer
30 views

What is to be called as solvent?

My book says: In a solution consisting camphor and nitrogen gas, camphor (solid) is solute whereas nitrogen gas is solvent. Doesn't this contradict the statements that: (1) Generally the component ...
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1answer
44 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 ...
0
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1answer
29 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 ...
2
votes
1answer
84 views

How to determine the proton concentration in the following solution in mol/L? [closed]

A $\pu{0.8L}$ solution contains $\pu{0.60 g }\ce{ NaOH}$ in water. Then the above question follows. It's been a long time that I made some chemistry exercises. Now I'm stuck with a couple of ...
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3answers
862 views

Chemical Reaction of aluminum foil in CuCl2 solution

In class we did a lab in which we first dissolved copper(II) chloride powder in water to form a blue solution. We then placed a crumbled up piece of aluminum foil in that solution. It turned brown ...
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1answer
18 views

Molarity of a substance in a solution when more fraction is given

Mole fraction of ethanol in a solution with water is $0.040$. What will be the molarity of ethanol in water? Density of water can be assumed to be $1\ \mathrm{g/mL}$. This is how I tackled the ...
0
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1answer
67 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 ...
0
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0answers
24 views

Does the solubility of a salt effect the volume of the resulting solution?

Lets say I have an ionic salt with a density of 1.3 g/mL that has a solubility of say, 10g/mL. If I drop 1.3 grams of this salt into 1 mL of water and shake it until completely dissolved will the ...
4
votes
1answer
125 views

Properties of azeotropes

Consider two liquids with vapour pressures in pure form being ${P^o}_A$ and ${P^o}_B$. ${P^o}_B >{P^o}_A$ which implies liquid B is more volatile. If the liquids formed an ideal solution, then a ...
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2answers
91 views

Calculate pH of a mixture of a strong base and acid. Knowing only the pH, wt/v%, and volume of both solution. [closed]

Title explains all. I have been stuck on this for an hour and for some reason cannot understand it. I have tried to do an ICE table but get stuck halfway as I do not know whether I would use the w/v ...
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1answer
167 views

Why does freezing point decrease when vapour pressure decreases in dilute solutions?

I was studying colligative properties of dilute solutions, and one of the properties was freezing point depression. The confusion I had was that, if vapour pressure decreases, it should be easier to ...
4
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1answer
42 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
73 views

dilution of Calcium Hydroxide [closed]

I have a 30% solution of Calcium Hydroxide. I want to make a 1% solution. How would I go about doing this? I tried using C1 x V1 = C2 x V2
3
votes
1answer
176 views

Why any non polar compounds dissolve in nonpolar substance like Benzene what is the reason behind it? [duplicate]

In case of ionic solvent the ionic solute dissolve in it because due to polar nature of water it break the bond between the ions through hydration energy and the ionic solvent dissolve in it. So I ...
4
votes
1answer
138 views

Mathematical explanation of blank titration in Mohr method for argentometry

In my book it is written that in order to minimize systematic error in Mohr method for argentometry it is a common procedure to conduct a blank titration with $ \mathrm{Ag^+} $ against a $\mathrm{CrO_{...
1
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2answers
203 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 $...
4
votes
1answer
166 views

Why do my equilibrium calculations on this HF/NH4OH buffer system not match those in literature?

I've been trying to reproduce Figure 2 from this research paper (full text available). The Problem However I can't seem to get the same values as in the paper. I did the math both by hand and with ...
0
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0answers
77 views

Are there alternatives to sodium acetate?

I am wondering if there are any non poisoning alternatives to sodium acetate, which is used in those self-heating pads, that reaction can be kicked off by clicking a small metal plate? Specifically ...
2
votes
2answers
104 views

How can I balance this reaction using the algebraic method?

How can I balance this reaction using the algebraic method? $$\ce{K4Fe(CN)6 + KMnO4 + H2SO4 + H2SO4 -> KHSO4 + Fe2(SO4)3 + MnSO4 + HNO3 + CO2 + H2O}$$ My solution: $$\ce{a K4Fe(CN)6 + b KMnO4 + ...
0
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0answers
48 views

Galvanic Corrosion in a Galvanic cell

I am doing an individual practical at school, which requires us to investigate the reactivity of metals, using galvanic cells. My initial proposal was to investigate the effectivity of different metal ...
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1answer
54 views

Can hydrogen peroxide be oxygenated?

As per the heading, would peroxide be able to dissolve oxygen by whatever method, to have free oxygen and hydrogen peroxide mixed (under pressure?) similarly to $\ce{CO2}$ or $\ce{O2}$ in water? I ...
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1answer
42 views

Solutions : Henry Law [closed]

In below solution why the moles are considered half as their is nothing clearly specified in question. I mean it is not given that that mole fraction we get is for litre water.
3
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0answers
48 views

Phantom Material: why formaldehyde doesn't rise my jelly melting point?

Just to be clear, I'm not a chemical but only a electronic engineer which want create a "phantom material" to reproduce the electrical characteristic of epidermis for the analysis of electrodes ...
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1answer
92 views

Chemistry - Solutions

Please give me a few hints as to how I can approach this problem A mixture of two miscible volatile ideal liquids P and Q (obeying Raoult’s law) is kept in a vessel (molar ratio of P and Q in the ...
3
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0answers
17 views

Is there a concise notation for a solution of one substance in another?

I'm aware of phase notation of $\ce{(aq)}$ for aqueous solutions. Is there something similar for solutions of chemical X dissolved in chemical Y?
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1answer
99 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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0answers
32 views

Hypothetically, can sufficiently powerful centrifugation separate normally miscible chemicals of differing densities?

Centrifugation is used to separate phases in suspensions by density. I read that this is not possible with colloids and solutions, but the distinction between the three seems to be optical properties ...