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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: cluckcluckchuck on March 28, 2005, 02:13:01 PM

Title: Acid-Base Properties of Salts
Post by: cluckcluckchuck on March 28, 2005, 02:13:01 PM

I am having trouble solving this problem.

Sodium azide (NaN₃) is sometimes added to water to kill bacteria.  Calculate the concentration of all species in a 0.010 M solution of NaN₃.  The K_a value for hydrazoic acid (HN₃) is 1.9 * 10^-5.

Title: Re:Acid-Base Properties of Salts
Post by: Borek on March 28, 2005, 05:23:50 PM

If you have calculated pH of NaCN solution you should have no problems with this one :)

Title: Re:Acid-Base Properties of Salts
Post by: AWK on March 29, 2005, 01:36:37 AM

NaCN is an another goals of wool. We are talking on sodium azide. Na+ and N3- can be allmost the same as NaN3, and HN3 can be calcualted from hydrolysis and approximately can be as low as 1% of salt concentration.

Title: Re:Acid-Base Properties of Salts
Post by: Borek on March 29, 2005, 04:04:50 AM

I was referring to cluckcluckchuck "Another Acid-Base Properties of Salts Problem" post - in both cases calculations are identical (hydrolysis of weak acid salt), just the final pH is different.