The ka of hydrazoic acid (hn3) is 1.9 × 10-5 at 25.0 °c. what is the ph of a 0.40 m aqueous solution of hn3?

The pH of the solution is 2.56.

Explanation:

Given :

Concentration (c) = 0.40 M

Acid dissociation constant =

The equilibrium reaction for dissociation of (weak acid) is,

initially conc.         c                       0         0

At eqm.                                      

Dissociation constant is given as:

By solving the terms, we get value of

No we have to calculate the concentration of hydronium ion or hydrogen ion.

Now we have to calculate the pH.

Therefore, the pH of the solution is, 2.56.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

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