Questions tagged [aqueous-solution]

For questions relating to compounds dissolved in water and resulting reactions and acid-base equilibria.

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582 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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77 views

Is there a reason why we add (CH3CSNH2) but not H2S in qualitative group analysis? [closed]

Brief question: In $\ce{Cu}$-$\ce{As}$ group analysis we are expected to add thinoacetamide to make a precipitate with sulfide. Can we use $\ce{H2S}$ instead?
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2answers
460 views

How many sodium ions is each oxygen atom attracted to in aqueous sodium chloride? [closed]

When $\ce{NaCl}$ salt is dissolved in water the $\ce{Cl-}$ and $\ce{Na+}$ ions and the polar $\ce{H2O}$ molecules are attracted to each other such that each $\ce{Na+}$ ion attracts several oxygen ...
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0answers
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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2answers
319 views

How to calculate mass of calcium fluoride that will dissolve in sodium fluoride solution?

The solubility product of calcium fluoride, $\ce{CaF2},$ is $\pu{1.46E-10 mol^3 dm^{-9}.}$ What mass of calcium fluoride will dissolve in $\pu{500 cm^3}$ of $\pu{0.10 mol dm^{-3}}$ sodium fluoride ...
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1answer
65 views

Reactions of diborane, silane, methane, aluminium, boron, sodium, phosphorus trichloride, white phosphorus and iron with water at RT [closed]

How many of the following will evolve $\ce{H2}$ gas when dissolved in water under room conditions? $\ce{B2H6},$ $\ce{SiH4},$ $\ce{CH4},$ $\ce{Al},$ $\ce{B},$ $\ce{Na},$ $\ce{PCl3},$ $\ce{P(white)},$ $\...
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1answer
332 views

Calculating the biological standard potential

I have an electrochemical cell with following overall reaction: $$\ce{5 Sn^4+ + 2 Mn^2+ + 8 H2O <=> 5 Sn^2+ + 2 MnO4- + 16 H+}$$ I have defined the half reactions as: $$ \begin{align} \ce{Sn^...
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2answers
2k views

Diluting 4 % NaOCl to get a 1 % solution

Assuming that one has a 1 litre bottle of liquid bleach containing $4~\%$ sodium hypochlorite. If I wish to dilute it down to $1~\%$ sodium hypochlorite (to use as disinfectant), would adding 3 litres ...
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1answer
445 views

Creating a 10 ppb Lead Nitrate Solution

I’m trying to make a 10 ppb Lead Nitrate solution as part of a concentration calibration step for a Beer Lambert’s Law experiment. I plan on performing a dilution in three steps. The calculations have ...
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1answer
254 views

Why is the solubility of calcium sulfate so low even though it is a salt? [duplicate]

What is the reason the solubility of calcium sulfate in water is so low? Compared to other salts like potassium sulfate (110 g/L) or calcium nitrate (1470 g/L) the solubility of calcium sulfate seems ...
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1answer
110 views

Measuring mole fraction in lab using Raoult's law

I was reading in my textbook of chemistry on the vapour pressure in liquid compounds, and came across a doubt regarding vapour pressure. If I have two liquids, one is A and another is B, and if I know ...
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249 views

Effect of charge density on electrolysis of dilute sulphuric acid

I am told that if electrolysis of dilute sulfuric acid is performed under high charge density, then the following reaction takes place at anode instead of evolving oxygen: $$\ce{2 HSO4- -> H2S2O8 +...
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2answers
334 views

Equilibrium involving both gas phase and aqueous phase

If I have been given an equation that involves a gas-aqueous phase equilibria, how do I write the equilibrium constant? I have come across several questions that give equations having BOTH gas and ...
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1answer
423 views

Why do azeotropes boil at constant temperature? [closed]

As given in the Wikipedia page, An azeotrope (/əˈziːəˌtroʊp/) or a constant boiling point mixture is a mixture of two or more liquids whose proportions cannot be altered or changed by simple ...
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2answers
338 views

In a double displacement reaction, why don’t the two products reform after being dissolved in water? [duplicate]

Let’s say I have $\ce{AB (aq) + CD (aq) —> AD + CB}$. When AB and CD are dissolved in water, they get dissociated into their component ions. But why don’t they reform as AB and CD, if it is already ...
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0answers
65 views

Two salts in mutual saturation, which one will precipitate first? [closed]

Let's say I have a satuated solution of two salts with a common ion e.g. KCl and KI, and they're at mutual saturation (let's say there are 75% by weight KCl/ 25% KI). If I slowly evaporate some water, ...
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1answer
75 views

Difference between homogeneous and heterogeneous mixture [closed]

When i mix two equal but large number of stones it is possible (though extremely unlikely) that stone a and stone b perfectly segregate themselves into two halves or that they are uniformly ...
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1answer
72 views

Indirectly Measuring Diffusion of NO2 into Water

I am working on a data science project with the central hypothesis is that air-born pollutants can become water-born through diffusion. The example I am using as a proof of concept is $\ce{NO2}$. The ...
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2answers
226 views

Do all metal salts in aqueous solution contain metal aquo complexes?

I know that nickel nitrate in aqueous solution contains the metal aquo complex ion $\ce{[Ni(H2O)6]^2+}$. But do all metal salts in aqueous solution contain such complex ions? If not, on what factors ...
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1answer
573 views

How to calculate the amount of water required to increase the pH of a solution from 2.1 to 4? [closed]

After working out the problem with certain approximation of considering the initial pH=2, my answer came out to be around 1 litre of water. But the correct answer is 79 litres of water. Can anyone ...
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1answer
58 views

Microscopic View of Adding Water to A Basic Solution

I confronted a problem, stating that we have a solution of potassium hydroxide. By adding extra water, when the volume of solution reaches 630 mL, the pH decreases by 0.5 units. How much extra water ...
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2answers
2k views

Is the salt of a weak acid and a weak base also a weak electrolyte?

I'm able to find a lot of information on acids and bases, as well as strong-strong, weak-strong, and strong-weak salts. However all the introductory materials on electrolytes just stop there and say "...
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3answers
141 views

How to decrease the percent of ammonia that is converted to the ammonium ion in water? [closed]

Ammonia is a weak base that reacts with water according to this equation: NH3(aq) + H2O(l) ⇌ NH4+(aq) + OH −(aq) Will Fe(NO3)3 decrease the ...
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1answer
19 views

Is the specific heat of salt the same as Na + CL when dissolved? [closed]

I had this question when my friends were discussing how salt influences boiling time. When crystal salt is dissolved into water, it turns into a single Na and a single Cl atom. If knew the total ...
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1answer
72 views

Finding the volume needed to make a new pH

In the titration of 20.00 mL of 0.500 M HCl by 0.500 M NaOH, calculate the volume of 0.500 M NaOH required to reach a pH of 2.0. I have tried to change the 20.00 mL into the amount of substance (0.01 ...
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44 views

Measuring ions through color change during electrolysis

I have very little experience in chemistry, you might consider me a physicist, and I am mostly not even sure where to find the information I need. I will start off by describing my problem, I have a ...
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0answers
34 views

Science of soap bubbles

On the web there are tons of different recipes for a solution to make soap bubbles. Most of them use only three ingredients: water dish soap glycerin But their ratios widely change among the sources....
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48 views

Are these two reactions the same? [duplicate]

I read the book an it said when $\ce{NH4Cl}$ dissolves in the water, the reaction of $\ce{NH4+}$ will be $$\ce{NH4+ <=> NH3 + H+},$$ but instead, the first reaction came to my mind was $$\ce{...
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1answer
111 views

Creating 1L of 1000 ppb stock solution of Pb2+

I’m testing on samples that require a concentration of 1000 ppb (or 1 mg/L) of Pb 2+. My first thought was to simply dissolve 1 mg of Lead nitrate in 1 L of deionized distilled water to create 1 L of ...
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1answer
36 views

Basic Water Dissolving Salt Questions

I have a basic question about how water dissolves salt. In the Khan Academy explanation, it says that the H and Cl atoms attract each other while the O and Na atoms attract each other. My question: ...
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0answers
33 views

What is the precipitate of aqueous copper (II) and polysulfides?

So if you heat up a piece of sodium engulfed in a large excess of sulfur, what you would get (from what I've read) is sodium polysulfide $\ce{NaS_n}$. But how large can $n$ get? If you left sodium ...
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2answers
107 views

How does one dilute sulphuric acid (1.28sg@25ºc 460g/L) to 3 M Sulphuric Acid?

Thanks for looking. The extent of my research around the issue so far. SA sg table but wrong temp 60f not 77f/25c http://www.sschemical.com/wp-content/uploads/2013/05/Conversion_Table.pdf From ...
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3answers
348 views

Are aqueous (aq) elements involved in equilibrium?

The reaction was something like this: A (s) + B (l) yields to C (aq) + D (aq) The question asked: If you added another D, which way would the equilibrium shift to? I answered that it would have no ...
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1answer
59 views

Can o-phenanthroline be used as a complexing agent for lead(II)?

I’ve been trying to find a method to perform a spectrophotometric analysis to determine lead concentration (on the ppm level). This would require some chelator capable of forming a coloured complex ...
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1answer
73 views

Seeing solubility in various cases

Match the following: $\begin{array}{|c|c|c|c|} \hline &\textrm{Column-I}&&\textrm{Column-II} \\\hline \textrm{(A)}&\ce{AgBr}&\mathrm{(p)}&\mathrm{(Solubility~in~water~is~more~...
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2answers
391 views

Chemicals that form coloured complexes with Pb2+

I’m currently conducting a photo-spectrometric analysis of lead concentration in water and was looking into using Eriochrome Black t as an indicator for Pb2+ (due to the complex forming a reddish ...
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1answer
525 views

How can I measure the amount of quinine in a home-made tonic water?

I'm into mixology, and lately I've been looking into experimenting with home-made tonic water, by extracting quinine (quinine salts) from cinchona barks in an acidic aqueous solution. I've read a bit ...
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1answer
58 views

Solution for Electroplating Selenium?

I need to electroplate selenium onto a conductive metal (for an experiment). The end goal is a thin film of pure, elemental selenium. Unfortunately I can't find anything on the internet: Ideally, I'd ...
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3answers
103 views

Is it possible to measure light absorbance for analysis of lead concentration without photospectrophotmeter

I’m designing an experiment which requires I measure final and initial lead concentrations for the determination of aqueous lead uptake by different mediums. Because lead concentrations would be ...
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1answer
36 views

How concentrated does the analyte solution need to be in order to perform a (chelatometric) titration

I’m currently investigating a method to chemically pretreat cellulosic waste as bisorbents for enhanced uptake of lead in water. I intend to measure the initial and final concentration of water to ...
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1answer
82 views

aqueous solution recipe calculations: Using oxy-bleach as surface sanitizer [NOT A PERSONAL HEALTH QUESTION] [closed]

NOTE: Please do not delete this question. It is not a personal health question. The question has broad utility, in cases where others find themselves in social-distancing or quarantine with need for ...
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1answer
78 views

Mechanistic explanation of salt lowering temperature of ice slush

As we all know, adding salt to ice water lowers its temperature. I've read plenty of system-level accounts of energy balances, enthalpies, vapor pressures, phase equilibria and freezing points—I ...
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2answers
112 views

Indicators of Cu(I) or Cu(II)

We performed an experiment in class where we placed a piece of copper wire in a solution of silver nitrate, we were tasked with predicted the mass of copper that should react and the mass of silver ...
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59 views

Hydrochloric acid substitute in an Iron-gall ink solution

Recently I started experimenting with making my own ink to be used in fountain pens. I was wondering if hydrochloric acid in an iron-gall ink is used to prevent sediment ONLY by lowering the pH of ...
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1answer
42 views

Does PEO particle size decrease when dissolved in water?

I am looking to make metallic ink for inkjet printing and using PEO 1 wt% (MW ~600,000) as a binder. The print head I am hoping to use has a nozzle diameter of 80 microns. The metal powder dispersed ...
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0answers
260 views

How to dissolve salicylic acid into a solution with humic acid [closed]

I'm not a chemist but I am trying to make a product to be used as a foliar spray on turfgrass for my own use. The product I'm trying to make is: 12% Humic acid ($\mathrm{pH =}$ 3.5-4.0) 2% Fulvic ...
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2answers
1k views

How much of Sodium dichloro-s-triazinetrione dihydrate should I use to replace bleach? [closed]

I am trying to determine how much sodium dichloro-s-triazinetrione dihydrate powder I should add to water to create a dilution that can be injected into my water supply to react with the Hydrogen ...
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1answer
39 views

What causes the differences in price in home testing kits for lead in water? [closed]

The price differences between home testing kits to test tap-water for lead are huge. 20 dollar will either buy 1 test kit or 100 test strips. Both are intended to test drinking-water safety. What ...
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1answer
146 views

Accurate method to calculate the pH of a salt from a weak acid and weak base

Can someone help me with this? The problem is as follows: Find the $\mathrm{pH}$ of $\pu{1M}$ solution of $\ce{NH4CN}$. Their respective hydrolysis constants are: $K_h = 5.6\times 10^{-10}$ ...
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1answer
96 views

Why did they ‘split’ this H2+ ion in the ionic equation?

I am asked this chemistry question in my textbook: Write an ionic equation for this reaction: $$\ce{Mg(s) + H2SO4(aq) -> MgSO4(aq) + H2(g)}$$ This is my thought process and answer: $\require{...

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