Problem: A buffer consists of 0.50 M NaH2PO4 and 0.40 M Na2HPO4. Phosphoric acid is a triprotic acid (Ka1 = 7.2×10−3, Ka2 = 6.3×10−8, and Ka3 = 4.2×10−13).(b) What is the buffer pH?

🤓 Based on our data, we think this question is relevant for Professor Aken's class at GMU.

FREE Expert Solution

Buffer Reaction: H2PO4-    ⇋    HPO42-  + H+

H3PO4   Ka1     H2PO4-    Ka2     HPO42- Ka3 PO43- 


Calculate the pH using the Henderson Hasselbach equation:

  • Use Ka2 = 6.3×10−8


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Problem Details

A buffer consists of 0.50 M NaH2PO4 and 0.40 M Na2HPO4. Phosphoric acid is a triprotic acid (Ka1 = 7.2×10−3, Ka2 = 6.3×10−8, and Ka3 = 4.2×10−13).

(b) What is the buffer pH?

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Our tutors have indicated that to solve this problem you will need to apply the Buffer concept. You can view video lessons to learn Buffer. Or if you need more Buffer practice, you can also practice Buffer practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Aken's class at GMU.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.