Ammonia acts as a base in aqueous solution

a.a
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Homework Statement



Ammonia acts as a base in aqueous solution; Kb is equal to 1.8 x 10-5. What is the Ka for the ammonium ion NH4+ in aqueous solution?

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The Attempt at a Solution



I am totally lost for this question, can someone please start me off? all i know is that Kw = Ka * Kb
 
on Phys.org


a.a said:
all i know is that Kw = Ka * Kb

You are given Kb, you should remember Kw value - just solve for Ka.
 

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