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Problem: Ammonium (NH4+) is a weak acid with a pK a of 9.26. The dissociation is:NH4+ ⇌ NH3 + H+Calculate the mass of ammonium added to 1 L of water in order to obtain a pH of 4 at equilibrium. 

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FREE Expert Solution

(1) Find the Ka and H+ from pKa and pH

H+ = 10-4 = 0.0001 M

Ka = 10-pKa = 10-9.26 = 5.50x10-10


(2) Set up ICE table and find initial NH4+ where x = 0.0001


(3) Find y where x = 0.0001.

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Problem Details

Ammonium (NH4+) is a weak acid with a pK a of 9.26. The dissociation is:

NH4+ ⇌ NH3 + H+

Calculate the mass of ammonium added to 1 L of water in order to obtain a pH of 4 at equilibrium. 

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Weak Acids concept. If you need more Weak Acids practice, you can also practice Weak Acids practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor All Professors' class at TAMU.