Making chemical solutions
An important part of Chemistry is the ability to make up solutions of a known concentration. This can sound quite complex, however it doesn't need to be.
The following is some simple instructions that will produce 250m of 1molar concentration of Sodium Chloride
I have made this solution up using pure Sodium Chloride, from a chemical supplier , rather than table salt which contains Sodium Ferrocyanide. If you need extra help with this try asking on Science forums  as there is a section on there for home chemistry.
I am also on the IRCNow network, where we are starting up a channel to discuss amateur / home science.
1 Better Equipped
2 Science Forums
3 Amateur Science
Growing salt crystals – 2nd attempt
Following my previous attempt at this. I am now repeating the experiment with pure Sodium Chloride. I am also using a 250ml conical flask, which is much larger.
This time I used hot water from the kettle, taking a precaution of warming this up with warm tap water first, just in case the sudden temperature changed caused the flask to shatter. I then added Sodium Chloride powder.
I am now leaving this to hopefully grow some nice crystals which I would expect to be more of a cuboid shape. This prediction is based on:-
- Pictures of similar results
- The molecular shape of Sodium Chloride.
I am doing this for:
- Support the STEM Group events
- Hopefully can use this in a school to help children grow their own crystals.
- Personal interest
- Research purposes
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License
Growing Salt Crystals
Reposting this due to adding a link to a Science Forum post.
As Salt (Sodium Chloride) dissolves in water, you can grow salt crystals quite easily. There are lots of instructions on the internet, on how to do this with Salt, as well as other chemicals; such as, Alum (Aluminium Sulfate), Borax (Sodium Borate) for example.
For the purpose of my attempt, I used
*a conical flask from my old Chemistry set,
* a wooden lollipop stick,
* paper clip (to hold the string in the solution)
This is illustrated in the first picture, while the 2nd is a photo of the resulting crystal formation.
I took more photos on the 4th October to illustrate further growth of the crystals
It is probably worth mentioning that table salt contains Sodium Chloride but also a Anti caking agent called Sodium Ferrycyanide which according to that wikipedia article is a yellow solid.
I am not sure if this somehow affects the growth or shape of the resultng crystals. At some point I should try the same experiment pure NaCl