Chemical Forums

Chemistry Forums for Students => High School Chemistry Forum => Topic started by: lukxiaofung on October 18, 2004, 10:13:02 AM

Title: NaCl dissolve in water
Post by: lukxiaofung on October 18, 2004, 10:13:02 AM

why i still see some crystal of NaCl(salt) in water after i dissolve the salt in water?

Title: Re:NaCl dissolve in water
Post by: AWK on October 18, 2004, 10:50:00 AM

NaCl dissolves in water rather slowly up to 36 g /100 g of H2O at RT  (~26 % w/w)
and 39 g/100 g H2O at 100 C (~28 % w/w)

Title: Re:NaCl dissolve in water
Post by: Demotivator on October 18, 2004, 03:50:29 PM

How do you know you have pure salt? You could have silica filler or impurities unless it's reagent grade.

Title: Re:NaCl dissolve in water
Post by: lukxiaofung on October 19, 2004, 09:17:01 AM

Actually I am going to get a bigger crystal of NaCl by crystallization,but it is fail. Any things that I did wrong?
First,I dissolved some salt in the water(~RT) until the solution saturated.
Then,I left it somewhere.
Finally,the water evaporated and the salt appeared again.