Questions tagged [aqueous-solution]
For questions relating to compounds dissolved in water and resulting reactions.
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0answers
18 views
Theoretical Resistance Relationship of Electrolytes [closed]
I'm a senior physics/chemistry student working on a practical assignment where I am trying to identify the resistance of CuSO4 in solution (distilled water). I have recorded my data and determined it ...
3
votes
2answers
48 views
Precipitating silver(I) salts from the solution of barium(II) cyanate and iodide
Consider a $\pu{10.0 mL}$ solution containing $\pu{1.0e-10 M}$ each of $\ce{Ba(CN)2}$ and $\ce{BaI2}$. If $\pu{3.5e-9 mol}$ of $\ce{AgNO3(s)}$ is added to this solution, will any precipitate(s) form? ...
1
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1answer
43 views
Why doesn't open-chain glucose react with water readily in aqueous solution?
Though the exact number given varies from 0.02% to 3%, it's well agreed that glucose spends a very small percentage of its time in aqueous solution as a linear aldehyde. Glucose's overwhelming ...
0
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2answers
34 views
What happens when mixing elemental mercury with sodium hypochlorite solution [closed]
Say you spilled elemental mercury from a thermometer and used household bleach on it, what would be the reaction if any?
-1
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2answers
29 views
Liquid Versus Aqueous States? [closed]
I am studying ionic equations and have encountered the statement of the phase of matter in the equation since ionic substances tend to react differently based on their phase.
I know that
(l) state ...
0
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0answers
16 views
Preparation of Copper (II) Sulfate Pentahydrate Solution
how would you make a solution of Copper (II) Sulfate Pentahydrate to achieve 150, 200, 250 and 300 mgL−1 concentration of copper? I do not have the anhydrous version of the solute. Also, when I ...
0
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2answers
21 views
Influence of pH on precipitate crystallite sizes?
It's normally assumed that a higher pH of solution would slow nucleation rates and hence lead to larger crystal formation. I've found literature that it is due to solid-liquid inter-facial tension. ...
2
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1answer
32 views
What is the minimum operating temperature of chemical hand warmers?
I have been looking at chemical hand warmers such as Hot Hands, Grabber and HotSnapZ. Unfortunately, I cannot find a minimum operating temperature for these types of devices. Logic tells us that they ...
0
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1answer
44 views
What is the percent of potassium as K₂O in the fertilizer sample?
The solubility of sodium tetraphenylborate in water is $\pu{470 g/L}$ while the solubility of potassium tetraphenylborate in water is $\pu{1.8e–4 g/L}$. Due to the orders of magnitude difference in ...
0
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2answers
30 views
Unit analysis for neutralization reaction
What volume of $\pu{0.500 mol L-1}$ $\ce{HCl}$ (in $\pu{mL}$) is required to neutralize $\pu{2.02 g}$ of solid $\ce{NaOH}$ pellets?
So far I have tried regular unit analysis:
2.02 g NaOH * 1mol ...
1
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2answers
52 views
Determining Kc for the equilibrium involving iron thiocyanate using spectrophotometric data
$$\ce{Fe^3+(aq) + SCN-(aq) <=> [Fe(SCN)]^2+(aq)}$$
$\pu{12.0 mL}$ of $\pu{0.00110 mol L-1}$ $\ce{Fe^3+}$ was added to $\pu{6.00 mL}$ of $\pu{0.00140 mol L-1}$ $\ce{SCN-}$. The absorbance of ...
2
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1answer
122 views
Percent Dissociated from Titration Curve
Question 818 references the titration curve. Answer is A because $\ce{H+}$ conc $= 10^{-4}$. This is conc of dissociated acid. The conc of the undissociated acid is the original concentration minus ...
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1answer
29 views
How can I reduce sodium chloride levels in water, without removing other minerals?
How can I reduce sodium chloride levels in water, without removing other minerals?
Good day,
I make a sole from Himalayan Salt which I add to my Reverse Osmosis treated water to ensure my body isn't ...
1
vote
1answer
43 views
Why is maximum buffer capacity for some diprotic buffers not when pH = pKa?
According to Rajkovic et al. [1]:
$$β = \frac{[\ce{H+}]}{K_\mathrm{w}} + 2.303\cdot\frac{[\ce{H+}]\cdot K_\mathrm{a}\cdot c}{[\ce{H+}] + K_\mathrm{a}}$$
where $K_\mathrm{a}$ is the ...
0
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0answers
30 views
H+ vs HCl in the gastric juice
Parietal cells in the stomach are known to expel $\ce{H+}$ ions into the gastric juice to keep the pH acidic. When $\ce{H+}$ $\ce{[H3O+]}$ can fully function as acid in the gastric juice, why do cells ...
1
vote
1answer
27 views
Should I include ions from the solvent in solubility product constant calculations?
I'm trying to determine the Solubility Constant $K_\mathrm{sp}$ of $\ce{Ba(NO3)2}$ dissolved in nitric acid solution $\ce{HNO3}$ from experimental data.
$\ce{HNO3}$ will be mostly dissociated so ...
0
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0answers
28 views
Can a solute be physically filtered out of a solvent?
Suppose that I have a substance dissolved in water. I then pour the solution into a filter. The filter's pores are large enough to allow the passage of water, but not the passage of the substance. In ...
6
votes
1answer
2k views
Can I boil off chlorine? Does it evaporate quickly at high temperatures?
Can I boil off chlorine?
Does it evaporate quickly at high temperatures?
I am asking because I want to remove it from drinking water, and I don't want to wait 24 hours for it to evaporate naturally.
1
vote
1answer
21 views
Which ions determine ionic conductivity of a salt solution?
Let's take $\ce{ZnSO4}$ salt solution in water for example. So the ions inside my solution will be $\ce{H+}$, $\ce{OH-}$, $\ce{Zn^2+}$ and $\ce{SO4^2-}$.
My questions are:
Is the ionic conductivity ...
0
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1answer
42 views
Effects of Ka on the Half-Equivalence Point
I'm new to studying chemistry at a university level and am currently reviewing acid-base titrations. I am wondering about the relationship between your ionization constant for a weak acid ($K_\mathrm{...
0
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1answer
56 views
Is NaCl the only precipitate when you add HCl to concentrated NaCl [closed]
When aqueous HCl is added to a saturated salt water solution, is NaCl the only precipitate or does some HCl crystalize as well?
Sources online say that NaCl crystallizes but they don't say what ...
1
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1answer
25 views
Is it stupid to put used acid into a pool after cleaning the chlorinator? [closed]
I have a salt pool, and when the chlorinator salts up with calcium, I clean it with a diluted acidic solution.
What happens to the acidic solution after the reaction happens? I.e., does the pH change?...
0
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1answer
22 views
Copper powder amount dissoved in water [closed]
How much copper powder dispersed into 2 liters of water will result in a 10 ppm concentration? I am not a chemist.
2
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1answer
44 views
How to take a sample of a hot salt solution without it precipitating in the cooler glassware due to the difference in solubilities at different temps?
I'm doing an investigation to see the effect of temperature on the solubility product of strontium hydroxide.
I made a supersaturated solution left in the oven overnight at 85°C for equilibrium to be ...
3
votes
1answer
42 views
How does monoethanolamine (MEA) increase pH?
I know pH of a solution increases with increase concentration of $\ce{OH-}$.
I'm wondering: when adding MEA, is the $\ce{OH-}$ group from the MEA breaking off, or is it the whole MEA molecule taking ...
1
vote
1answer
37 views
Reactions between Ca(OH)2 and CO2, and Sr(OH)2 and CO2
So I'm doing an investigation, and it involves using supersaturated solutions of Ca(OH)2 and of Sr(OH)2. I notice that there's always a flaky precipitate formed on top. I need to know about the ...
1
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1answer
38 views
Identifying Lewis acid
What is the Lewis acid on the reactants side?
$$\ce{HNO2(aq) + HPO4^{2-}(aq) <=> NO2-(aq) + H2PO4-(aq)}$$
The book says it is the $\ce{H+}$ only, not the whole molecule of the nitrous acid, ...
2
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0answers
48 views
Mechanism for removal of pesticides from fruit by sodium bicarbonate
When Googling around for methods to remove pesticides from fruits and vegetables, a study commonly referred to from some news sites (e.g. here and here ) is one where soaking apples in a sodium ...
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1answer
30 views
Polyprotic Acid Titrations
Titrating a mixture of strong and weak acids will yield endpoints such that the volume of base required to reach each endpoint will be different for each acid, e.g. in a mixture of HCl and CH3COOH, ...
0
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1answer
48 views
How to make oil more heavy?
I would like to increase the density of a given oil (or anything that repels water) so that it is slightly heavier than water; to be able to precisely control how slow the oil would fall in the water.
...
0
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0answers
38 views
Qualitative analysis of iron(III) salt
Why will $\ce{Fe^3+}$ give brown ring test?
In my textbook it was given that ferric ion gives brown ring too. I am confused, if ferric ion is already present, then what will reduce nitrate ion to ...
1
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0answers
33 views
how can I predict the rate of water ions precipitation on a surface?
Consider a titanium pot that contains 1kg water with the following ions:
$[Ca^{2+}]=22000$ ppm, $[Mg^{2+}]=1500$ ppm,$[Sr^{2+}]=791$ ppm,$[Na^{1+}]=48000$ ppm,$[Cl^{1-}]=120000$ ppm,$[SO_4^{2-}]=...
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3answers
85 views
An aqueous solution of NaCl has a mole fraction of 0.21. What is the mass of NaCl dissolved in 100.0 mL of solution? [closed]
Work
mole fraction of NaCl = 0.21/0.21+0.79
If there is 1 mol of total solution, there will be 0.21 mol NaCl and 0.79 mol H2O
0.21 mol NaCl = 12.27 g
0.79 mol H2O = 14.23 g
this would yield a ...
1
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2answers
93 views
How much of Ag has formed on the Cu tile?
$\pu{9.547 g}$ $\ce{Cu}$ tile is added to an $\ce{AgNO3}$ solution. After some time, $\ce{Cu}$ was taken out of the solution, washed, dried and weighed. The mass appeared to be $\pu{9.983 g}$. How ...
0
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1answer
109 views
Equilibrium constant for the neutralization of weak acid by strong base
Acetic acid has a $K_\mathrm{a}$ of $\pu{1.8e-5}$. What is the equilibrium constant for the neutralization of this acid with $\ce{NaOH}$?
Given acetic acid
$$\ce{HC2H3O2 + H2O <=> C2H3O2- + ...
1
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2answers
258 views
Calculating solubility of iron(III) hydroxide in water
The following example in Skoog's Analytical Chemistry uses mass-balance and charge-balance equations to calculate the solubility of iron(III) hydroxide in aqueous solution.
$$
\begin{align}
\ce{Fe(...
0
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1answer
43 views
Why this redox equation occurs on basic medium?
I have the following redox equation that I need to balance:
$$\ce{MnO4-(aq) + SO3^2-(aq) → MnO2(s) + SO4^2-(aq)}$$
The problem says that it happens on basic medium, but I don't see the $\ce{OH-}$ ...
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votes
1answer
41 views
How do I get a 20% ratio of sodium bisulfate with 1 gallon water? [closed]
How many lbs do I add to 1 gallon of water to get a 20% sodium bisulfate ratio? I am in the middle of anodizing some aluminum.... I just threw the whole 3 lbs in... hopefully it works... I ended up ...
3
votes
2answers
153 views
Is Fe(OH)2 soluble in alkalis?
I have just started inorganic chemistry in school and I have just learnt about metal aqua ions and how they react in water. I learnt that $\ce{[Fe(H2O)6]^2+}$ reacts in water by losing a $\ce{H+}$ ...
11
votes
4answers
272 views
Is there any electronic component to water conductivity?
Answers to Decrease in temperature of a aqueous salt solution decreases conductivity indicate that the electrical conductivity of salt solutions arises from the mobility of ionic species and therefore ...
5
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2answers
297 views
Decrease in temperature of a aqueous salt solution decreases conductivity
Why does the conductivity of a water solution drop as the temperature decreases?
How are these two related?
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1answer
51 views
Acidity of carbonate ions creates paradox?
Whilst I understand why salts can be acidic or basic, the carbonate reaction confuses me (carbonate being a basic ion).
$$\mathrm{{CO_3}^{2-} + H_2O \ce{<=>} {HCO_3}^- + OH^-} \\
\mathrm{{...
1
vote
1answer
46 views
Dissociation behaviour of polyelectrolytes
Assuming a solution of 100 polycationic molecules, each of them carrying 100 amino groups and an apparent pKa of 6.5. Would it mean that, at a pH of 6.5,
50 molecules will be fully protonated
50 ...
2
votes
1answer
56 views
Why degree of dissociation/ionisation affected by dilution? [closed]
What happens when we dilute, say, an acid which is weak, and then add water to it? What motivates or pushes it to dissociate more?
We are just adding some molecules of water, right? So, what exactly ...
0
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2answers
45 views
Is the reaction involving a proton transfer a redox reaction?
$$
\begin{align}
\ce{H2S (aq) + NH3 (aq) &→ NH4+ (aq) + HS- (aq)}\tag{1}\\
\ce{Pb(s) + 2 FeCl3 (aq) &→ 2FeCl2 (aq) + PbCl2 (aq)}\tag{2}
\end{align}
$$
Which of the following statements ...
1
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0answers
31 views
What causes the turbidity when preparing Fenton's reagent?
New guy, please be gentle. I might ask questions not according to conventions, I am not a chemist nor do I study chemistry. Feel free to adapt the question and the tagging.
I am preparing a solution ...
0
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0answers
37 views
Can a substance be extracted from solution by adding another substance with a higher solubility?
Suppose that I have a substance X dissolved in water. I then add a substance Y to the solution. Substance Y has a higher solubility in water than substance X, and more than enough of substance Y is ...
1
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1answer
46 views
Concentration of Hydrogen Ions
I am slightly confused about one certain task.
There are 4 different solutions ($\ce{NH3}$, $\ce{HCl}$, $\ce{NaOH}$, $\ce{CH3COOH}$), their concentration is the same $(c = \pu{1 mol L-1}).$ Which ...
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1answer
23 views
Can I have a homogeneous 2 molal solution of copper(II) sulfate at 20 °C?
I'm doing a high school chem project where I am making a calibration curve of copper(II) sulfate for spectrophotometry in which I make solutions with five different concentrations. The most ...
0
votes
3answers
54 views
Solubility and pH
I was reading about antacids. It stated that in earlier times $\ce{NaHCO3}$ and a mixture of aluminium and magnesium hydroxide were used as antacids. In excess $\ce{NaHCO3}$ can make the medium ...
