All Questions
Tagged with aqueous-solution inorganic-chemistry
252
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pH of an aqueous solution of Mg2+ kept rising above that of clean water. What's going on?
In a recent inorganic chemistry lab session, we tested the pH of various ions in water. The water turned out to be on the acidic side (5.5 with $\mathrm{pH}$-paper, 5.59 with $\mathrm{pH}$-meter). A ...
- 341
0
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1
answer
786
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Why is the solution of ammonium bifluoride more acidic than aqueous ammonium fluoride?
At low concentrations of aqueous $\ce{NH4HF2}$ $(w = 1–2\,\%)$ $\mathrm{pH}\approx 3.$
But aqueous $\ce{NH4F}$ $(w = 20–40\,\%)$ has $\mathrm{pH}\approx 7.$
Yet the equilibria of
$$
\begin{align}
\ce{...
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Does aqueous ammonium fluoride solution release hydrogen fluoride vapors?
Can $\ce{HF}$ vapors be released from $\ce{NH4F}$ solution in water $(w(\ce{NH4F}) = 40\,\%)$ at room temperature?
I assume that dissolving $\ce{NH4F}$ in water produces small amount of $\ce{HF}.$
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1
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390
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Balancing complex redox reaction of gold treated with sodium cyanide
How would you balance this reaction:
$$\ce{Au(s) + NaCN(aq) + O2(g) + H2O(l)-> Na[Au(CN)2](aq) + NaOH(aq)}?$$
Here’s what I’m came up with. First we can balance any atoms besides hydrogen and ...
- 145
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0
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59
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What happens to dissolved ions when an aqueous solution evaporates?
I'm working on a chemical design project where zeolite crystals containing $\ce{Na+}$ cations is ion-exchanged via an aqueous solution of $\ce{AgNO3}$, $\ce{Cu(NO3)2}$, and $\ce{Zn(NO3)2}$, also ...
2
votes
2
answers
116
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Criterion for gravimetric analysis of silver
If the only criterion for gravimetric analysis of silver is solubility of precipitate, which one of the following two compound are we supposed to choose? $K_\mathrm{s}(\ce{AgCl}) = \pu{1.78E-10}$ and ...
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128
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Nernst equations for the reduction of sulfate(IV) and nitrate(V) anions
Write a Nernst equation $(\pu{25 °C})$ for system:
$$\ce{SO3^2- + 3 H2O + 6 e- -> S^2- + 6 OH-}\tag{R1}$$
and system:
$$\ce{NO3- + 3 H+ + 2 e- -> HNO2 + H2O}\tag{R2}$$
I am not really sure if ...
- 21
2
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0
answers
56
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Calculating the solubility for chromium(III) hydroxide using the complex ion constant
Problem
$$
\begin{align}
\ce{Cr(OH)3(s) &<=> Cr^3+(aq) + 3 OH-(aq)} &\quad K_\mathrm{sp} &= \pu{6.7E-31} \\
\ce{Cr^3+(aq) + 4 OH-(aq) &<=> Cr(OH)4-(aq)} &\quad K_\...
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1
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99
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Basic behavior of ammonia in aqueous medium [closed]
Thanks to the reversible reaction
$$\ce{NH3 + H2O <=> NH4+ + OH-},\tag{R1}$$
we know that ammonia acts as a weak base. However, I was wondering why it ends up forming ammonium $\ce{NH4+}$ and ...
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3
votes
3
answers
3k
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How to separate a mixture of sodium chloride and sodium hydroxide?
I recently did a double displacement reaction in which I formed a solution of water with sodium hydroxide and sodium chloride dissolved in it. Now I want to separate both of them. How can I do this?
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-1
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2
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1k
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Determining the formula of sodium carbonate hydrate using acid-base titration [closed]
I found this question online at mathsmadeeasy.com:
Sodium carbonate exists in hydrated form, $\ce{Na2CO3 · x H2O},$ in the solid state. $\pu{3.5 g}$ of a sodium carbonate sample was dissolved in ...
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112
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Arrhenius acids and bases
According to the Arrhenius definition of acids:
An Arrhenius acid is any species that increases the concentration of
hydrogen ions in its aqueous solution.
Hydrogen Chloride gas ionises in water to ...
- 1
3
votes
1
answer
375
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Identification of aqueous solutions of sodium hydroxide, sodium acetate and potassium thiocyanate using nickel(II)
I'm very new to chem — taking an intro to chemistry course where we are currently focused on substance identification. I have two substances, both aqueous solutions of either $\ce{NaOH},$ $\ce{KSCN},$ ...
- 131
3
votes
2
answers
844
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Disproportionation of silver(I) in aqueous solution
Use the following equations to predict whether or not $\ce{Ag+}$ ions will disproportionate in solution:
$$
\begin{align}
\ce{Ag+(aq) + e- &-> Ag} &\qquad E^\circ = \pu{+0.80 V}\\
\ce{Ag^2+(...
- 39
2
votes
4
answers
2k
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Help with determining concentration of magnesium hydroxide for a specific pH level
This seems like such an obvious and elementary-level question for someone who has taken high school chemistry, but yet I'm having a difficult time solving it. I need to find the right amount of $\ce{...
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