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.
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