Questions tagged [aqueous-solution]

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

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58 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 ...
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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
86 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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How to keep Cu+ in an aqueous solution? [closed]

Explain your solution please Tell me how to keep cu+ stable in an aqueous solution
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2answers
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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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27 views

How do ethanoate ions react with water?

In an exam question, we are asked why ethanoic acid forms a basic solution when reacted with sodium hydroxide: $$\ce{CH3COOH(aq) + NaOH(aq) -> CH3COONa(aq) + H2O(l)}\quad K_\mathrm{a}(\ce{CH3COOH})...
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1answer
47 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
65 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
39 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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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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1answer
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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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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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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
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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
32 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
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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
27 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
42 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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Can the ion that isn't preferentially discharged discharge at the same time during electrolysis?

I would like to ask if the ion that isn't preferentially discharged can discharge at the same time during electrolysis. Also, is the ion discharged at a much smaller extent or just discharged right ...
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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
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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
15 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
45 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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32 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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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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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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Is there an exothermic reaction when washing hands with water and hand sanitiser?

I accidentally washed my hands with water (cold/lukewarm) and hand sanitiser alcohol (room temperature) instead of soap. I felt like my hands have gotten warmer when I applied it. Only using alcohol ...
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1answer
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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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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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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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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
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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
24 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
25 views

Seeing solubility in various cases

[![enter image description here][1]][1] Question is in the image 'match' each option having multiple answers. I have invested a considerable time over this but couldn't solve it. Anyone explaining how ...
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2answers
54 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
283 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
29 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
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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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What is the lattice enthalpy of zinc chloride?

I am trying to find a literature value for the enthalpy of solution of zinc chloride to compare with my experimental value but I can't seem to find it. So I'm trying to use the formula: enthalpy of ...
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1answer
29 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
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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
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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
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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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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
23 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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Liquid fertilizer nutrient values - % weight by weight or % weight by volume?

I was convinced that liquid fertilizer labeling use the % weight by volume convention. However now I bought a magnesium-sulfur based additive. The label clearly uses % weight by weight. Weight by ...
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1answer
51 views

Are Hansen solubility parameters available for inorganic salts or ionic molecules?

Are Hansen solubility parameters available for inorganic salts or ionic molecules (e.g. potassium oleate, potassium stearate, sodium dioctyl sulfosuccinate (AOT), sodium dodecyl benzol sulfonate (SDBS)...
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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
712 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
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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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