Unanswered Questions
241 questions with no upvoted or accepted answers
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What formula allows adjusting balance of (Ethyl Alcohol / Water / Caffeine powder) to know concentration for the Caffeine solution?
I am experimenting with different levels of concentrated caffeine solution. The solution has a small percentage of ethyl alcohol, in the $\ce{H2O}$.
Problems encountered too much ethyl alcohol ...
- 2,211
-1
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1
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207
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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, ...
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1
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65
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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 ...
- 38.4k
-1
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1
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60
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Will a reverse osmosis membrane exclude perfluorobutanoic acid?
I recently did a water quality test and it showed a detectable level of perfluorobutanoic acid, a potentially dangerous carboxylate PFC.
Will a reverse osmosis water purification system exclude this ...
CommunityBot
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1
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1k
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Reaction of soluble salts
If we were to mix two soluble salts together, for instance sodium nitrate and potassium chloride together, and their products are also soluble, will any reaction still occur? Say if we were to boil ...
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1
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1k
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Are concentrated salt solutions stable over time?
I have to use dilute salt solutions incredibly frequently, and it takes valuable time to make them from pure reagents every time I need them.
Are concentrated salt solutions fairly stable over time?
...
CommunityBot
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-1
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1
answer
91
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Solving detergent powder in a solution
I used a detergent powder mixed with water to clean my espresso machine. Some micro particles of powder are stuck into machine's inner tank. So when I pull the hot water out of the machine's nozzle, ...
CommunityBot
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-1
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1
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How can I get create complex metal ion solution such that the majority of the central metal ions only have one specific ligand?
I'm looking for a way to have the ligand, Chloride ion, datively bond with Copper Sulphate.
I understand it is as simple as creating a solution of Hydrochloric Acid and dissolving Copper Sulphate ...
CommunityBot
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-1
votes
1
answer
385
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Can the ions of dissolved salts be physically separated with a strong enough external electric field?
Say you had a arbitrary amount of sodium chloride dissolved in water. Could an external electric field (e.g. the electrically charged plates in Millikan's oil drop experiment) physically pull apart ...
CommunityBot
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-1
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1
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149
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Determine concentration of phosphate after copper(II) oxalate is precipitated
Solution with $\ce{Na3PO4}$ with $\pu{0.02 M}$ concentration and $\ce{Na2C2O4}$ with $\pu{0.03 M}$ concentration. I add excess $\ce{Cu(NO3)2}$ very carefully – tiny amounts.
What will be my $\ce{PO4^...
- 6,921
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1
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146
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Loaded and unloaded solutions
What is the difference between a loaded solution and an unloaded solution? I was reading this article and I didn't understand these parts:
The reaction kinetics of $\ce{CO2}$ with loaded aqueous ...
CommunityBot
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-2
votes
3
answers
343
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Why are buffer solutions not neutral
I am very confused about buffer solutions and I have lots of ideas about them which don’t integrate together so I really can’t tell which are correct and which are wrong. That being the case it’s ...
- 2,295
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1
answer
77
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Mass of gaseous ammonia required to prepare ammonia solution of a given pH
How many grams of gaseous ammonia do you need to make $\pu{200 mL}$ aqueous ammonia solution with $\mathrm{pH} = 11.34?$
As the mole ratio is the same for $\ce{H+}$ and $\ce{NH3},$
$$\ce{NH3 + H+ -&...
- 29.2k
-2
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1
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143
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What's the pH of a solution knowing only pKa, mass and volume? (no molecular mass known)
Is it possible to calculate the pH of a given solution knowing only the pKa (but not the structure of the acid, i. e. its molecular mass), its mass and the volume of the solution? E. g. What is the pH ...
-2
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1
answer
248
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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 ...
- 42.7k