All Questions
44
questions
5
votes
2
answers
3k
views
A solution is cloudy at lower concentration and becomes clear at higher concentration. Why?
This might be just an "everyday life science" question. I am a university professor but not in chemistry so please educate me. Today I was adding some floor cleaner formula to water as ...
- 6,801
2
votes
4
answers
172
views
How can the Kw of water be constant?
I know in neutral solution, $\ce{[H+]}= \ce{[OH-]}= \pu{1.0 x 10^-7}$.
However, let’s say I add an acid like HCl. This will increase $\ce{[H+]}$, therefore it’s no longer $\pu{1.0 x 10^-7}$, but is ...
- 22.5k
3
votes
0
answers
45
views
What is the goopy substance that forms before CaCO3 precipitates?
I do a lab where we mix a solution of sodium carbonate with a solution of calcium nitrate. As expected, calcium carbonate (white solid) precipitates out. However, if the concentration is high enough, ...
- 49
21
votes
3
answers
5k
views
Does freezing a solution with water always cause the water to separate and form the ice lattice?
I'm curious, I was trying to look into the affect of freezing a solution with water even when the solution is completely miscible. I came across something that detailed this regarding salt water and ...
- 4,606
0
votes
0
answers
357
views
How do I keep my homemade liquid fabric softener from separating?
I have a recipe for a homemade liquid fabric softener that smells good and works great, but I have to shake it every time before I use it. It gets old fast.
The recipe calls for:
12 cups hot water, ...
1
vote
0
answers
57
views
Can addition of a "neutral" salt like NaCl assist pH test strip measurement accuracy in low ionic strength/poorly buffered solutions?
After a web-search, it seems ISAs (Ionic Strength Adjusters) are offered commercially to assist pH electrode/probe measurements. Presumably meant to increase conductivity (without affecting pH ...
- 129
1
vote
1
answer
141
views
Using a pH meter to measure the presence of water in liquid ammonia? [closed]
I intend to do some experiments with building an ammonia-water gas adsorption refrigerator similar to a Crosley Icyball Wikipedia - Icyball. When recharging the icyball, it is important to not ...
- 29.2k
9
votes
1
answer
4k
views
Why does Dead Sea water feel greasy?
The best explanation I found so far is this:
These salts (magnesium, potassium, sodium, etc.) are responsible for the "greasy" feel of the water.
But it doesn’t say which salts exactly are ...
CommunityBot
- 1
-5
votes
1
answer
1k
views
What is the difference between atom and nucleus? [closed]
Atomic nucleus-The atomic nucleus is the small dense region consisting of protons and neutrons at the center of an atom discovered in 1911 by EARNEST RUTHERFORD. Atoms are made up of a positively ...
- 795
0
votes
2
answers
1k
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Why doesn't base/acid reacting with water create a salt?
An acid/base nwutralization will create a salt + water. If one uses water itself as the acid or base, and have an acid/base neutralization, how come that doesn't create a salt?
For example:$$ \ce{HCN(...
- 400
0
votes
1
answer
207
views
Deposition of saturated solution and affect of evaporated water
20g of water is evaporated from 200g of saturated solution of KNO3(aq) at 60°C by heating and the solution was cooled to 20°C. How many grams of KNO3 were deposited? The solubility of KNO3 in 100g of ...
- 3
-1
votes
2
answers
520
views
Effect of water vaporation on saturated solution
At a high temperature, water is evaporated from the saturated solution by heating. What is the solution losing exactly by the fact that the water left the saturated solution? Does it affect its ...
0
votes
0
answers
50
views
Solubility Product, and it's relation to solubility
In order to remove temporary hardness of water, it is boiled.
On boiling, while Ca(HCO3)2 gives CaCo3(ppt.) , Mg(HCO3)2 gives Mg(OH)2(ppt.).
According to my book precipitation of Mg(OH)2 occurs due to ...
- 41
2
votes
1
answer
8k
views
Does glycerin promote bacterial growth the same as water?
A sodium chloride + water solution draws the water out from bacteria through the process of osmosis.
Would a sodium chloride + glycerin solution have the same antibacterial effect?
If I understand ...
- 22k
1
vote
0
answers
966
views
Freezing point of solution of Water, Ethanol and Sugar (aka, Limoncello)
I'm looking for a diagram of the freezing point of a water solution depending on its content in sugar and ethanol. More colloquially, I want to know how to balance alcohol and sugar so that my ...
- 4,606