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Topic: What is the Kb and pKb for hydrazine and the pKa of its conjugate acid?  (Read 11836 times)

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Offline oneofak1nd

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What is the Kb and pKb for hydrazine and the pKa of its conjugate acid?
« on: January 15, 2007, 04:25:59 PM »
this problem is killingg mee:

Hydrazine, N2H4, has been used as a rocket fuel. Like ammonia, it is a Bronsted base. A 0.15 M solution has a pH of 10.70. What is the Kb and pKb for hydrazine and the pKa of its conjugate acid?

Can someone tell me the reaction equation? I tried to figure out what hydrazine breaks down into but im having difficulty. Also can the pH be used to determine the OH- concentration?
« Last Edit: January 15, 2007, 04:29:12 PM by Mitch »
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Offline Mitch

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Re: Acids and Bases *delete me*
« Reply #1 on: January 15, 2007, 04:28:42 PM »
If it tells you hydrazine is a base, what do bases like to do?
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Offline oneofak1nd

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Re: What is the Kb and pKb for hydrazine and the pKa of its conjugate acid?
« Reply #2 on: January 15, 2007, 04:53:27 PM »
accept hydrogen ions...
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Offline Mitch

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Re: What is the Kb and pKb for hydrazine and the pKa of its conjugate acid?
« Reply #3 on: January 15, 2007, 05:25:20 PM »
Right. So knowing that, why don't you write us the chemical equation?
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Offline english

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Re: What is the Kb and pKb for hydrazine and the pKa of its conjugate acid?
« Reply #4 on: January 15, 2007, 05:50:06 PM »
For every 1 mol of B+H formed, 1 mol of -OH  is formed. 

pH + pOH = 14


Knowing the pH, you can find the pOH.  The pH should be relatively high.
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