Normality and specific gravity

Discus: SAT/ACT Tests and Test Preparation: June 2004 Archive: Normality and specific gravity
 By Pianolover25 (Pianolover25) on Sunday, May 30, 2004 - 01:27 pm: Edit

Do we need to know these concepts for the SAT 2?

 By Physicskid123 (Physicskid123) on Sunday, May 30, 2004 - 02:27 pm: Edit

I got an 800 and don't know what they are... guess not.

 By Erics123 (Erics123) on Sunday, May 30, 2004 - 02:35 pm: Edit

Yes. They were on the mini-SAT II, so they're probably valid SAT II questions. Normality is the concentration of H+ or OH- in solution. So, 1 M H2SO4 is 2 N H2SO4 for an acid-base titration. Specific gravity is a synonym for density in g/mL.

(Not really. Technically, it's the ratio of a mass of a substance to an equal mass of water. Since 4 C water weighs 1 g/mL (by definition), 1 unit of specific gravity is 1 g/mL)

 By Physicskid123 (Physicskid123) on Sunday, May 30, 2004 - 02:37 pm: Edit

ohh durr I am so retarded. I was thinking physics, since I remember seeing specific gravity in the Barrons SAT II physics book. Sorry!

 By Pianolover25 (Pianolover25) on Friday, June 04, 2004 - 12:21 am: Edit

Then how would you find the normality for Aluminum sulfate?

 By Scion (Scion) on Friday, June 04, 2004 - 12:38 am: Edit

Al(SO4)3

Al 3+

so normality is 3, i think

 By Thunder77 (Thunder77) on Friday, June 04, 2004 - 05:21 pm: Edit

No, it depends on gram equivlent per liter

You divide molar mass of Al(S04)3 by 3 since Al's charge is +3. This is the gram equivlent mass

Then you find how many gram equivalent mass there are per liter !

 By Scion (Scion) on Friday, June 04, 2004 - 06:50 pm: Edit

o ok