# Questions tagged [aqueous-solution]

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

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### Mole fraction in aqueous solution [closed]

The mole fraction of an aqueous solution of magnesium bromide is 0.543. Calculate the molarity (in mol/L) of the magnesium bromide solution, if the density of the solution is 1.49 g/mL.
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### Calculating concentration [closed]

An aqueous solution of magnesium nitrate is prepared by dissolving $\pu{8.91 g}$ of magnesium nitrate in $4.36 \times \pu{102 g}$ of water. The density of the solution is $\pu{0.840 g cm^-3}$. ...
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### Net ionic equation [closed]

I am slightly confused about the net ionic equation for the reaction of hydrochloric acid and potassium hydroxide: $$\ce{HCl + KOH —> KCl + H2O}$$ I am aware that the standard procedure for net ...
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### Where are the hydroxyl ions going?

We write $$[\ce{H^+}]\cdot [\ce{OH^-}] = 10^{-14}$$ in aqueous solution. When I add acid, the $[\ce{H^+}]$ will go up then $[\ce{OH^-}]$ will decrease to maintain the constant product, but where ...
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### Would it be possible to use phosphorus pentoxide as a heat storage material?

The reaction of phosphorus pentoxide with water shows the exorbitant solution heat of -377 kJ/mol (according to german Wikipedia; don't know if it means as per mol P2O5 or per mol P4O10). Is this ...
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### Computing enthalpy of formation of dissolved gas from its enthalpy of dissolution

Provided that I know the enthalpy of formation $\Delta H_f^0(X_{g})$ of a substance $X$ in gas phase and its enthalpy of dissolution $\Delta H^0_{sol}(X)$ in the same conditions, considering that the ...
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### Balancing the chemical equation using Oxidation Number Method [closed]

Permanganate ion reacts with bromide ion in basic medium to give manganese dioxide and bromate ion. Write the balanced ionic equation for the reaction. Please balance the equation using the oxidation ...
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### Reacting ZnSO4 with KCl

I'm considering the following reaction: $\ce{ZnSO4} + 2 \ce{KCl} \ce{->} \ce{ZnCl2} + \ce{K2SO4}$ The high solubility of $\ce{ZnCl2}$ would favour the $\ce{ZnSO4}$ & $\ce{KCl}$ direction of ...
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### Is Phosphate (PO4 3-) solube in water? [closed]

Josh~ Superphosphate is used instead of just phosphate because superphosphate is a compound whereas phosphate is an ion. This means that phosphate must attach itself with a cation in order to give a ...
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### How Would A Vast Mixture (Like an Ocean) of Ammonia-Water Behave in Terms of Evaporation and Freezing?

First, I'll go ahead and say I'm not very versed in chemistry. My question comes from my interest in planetary-sciences, specifically the speculation that there are likely exoplanets and moons with ...
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### The time-dependent pH value in a fermentation

I want to know if someone has supporting tips or solutions to my problem: In biotechnology, fermentations are used to grow microorganisms. These need a specific media/broth in which temperature, pH, ...
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### Viscosity and concentration of solutions

I will need a fluid around a specific viscosity, using a mixture of water and something like sugar. Is there a way to calculate viscosity based on concentration?
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### How does sodium carbonate reduce pH?

Sodium carbonate is used in pools to raise pH. From my understanding, it would dissociate in water like so: $$\ce{Na2CO3 <=> 2 Na+ + CO3^2-}$$ To raise pH, doesn't it have to absorb hydrogen ...
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### How to derive the conductivity titration curve which accounts for salt formation

I derived an equation that gave me the volume of base required to get a certain $\mathrm{pH}$: In a titration between a weak acid $\ce{HA}$ and weak base $\ce{B}$ (adding base into acid solution) the ...
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### Reaction of Lead(II) Chloride and Ammonia

While searching how to identify cations in a solution I found that ammonia could be used to distinguish between $\ce{AgCl}$ and $\ce{PbCl2}$ precipitates after $\ce{HCl}$ had been added. Why does ...
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