Making a 31% solution a 10% one... Math?

[brian steinberger]

I have a 31% solution (100ml total) of hydrochloric acid and a formula that calls for a 10% solution. This may be a stupid question, but I'm bad at math. This is my guess, add water to make 310ml?

 

[Anon Ymous]

Yes, you can add water to make 310ml and it will become a 10% solution. On the other hand, if you need x ml of 10% solution, then x/3,1ml of the 31% solution will give the same amount of HCl.

 

[Bob-D659]

Always add the acid to water, not the other way around, otherwise you just might get a bath.

 

[brian steinberger]

Thanks so much guys!