[alt-photo] Re: Zia standard solutions

[Loris Medici]

  Terry you start to look funny from here... I'll play your game anyway!

How about this scenarios:

1. You need to prepare a 10% sulfuric acid solution from concentrated 
sulfuric acid. What to do?

2. You're asked to prepare trisodium citrate solution with an "exact" 
strenght of 20%. (That's what the manual / instructor and/or process 
needs calls for...) All you can have from the chemistry store is the 
dihydrate or the pentahydrate variants. What to do?

Regards,
Loris.