Problem: Calculate the pH of a buffer solution prepared from 0.155 mol of phosphoric acid, 0.250 mole of KH2PO4, and enough water to make 0.500 L of solution.

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

FREE Expert Solution

Phosphoric acid is a weak acid that ionizes partially in its aqueous solution.

H3PO4(aq) + H2O(ℓ)  H3O+(aq) + H2PO4-(aq).


KH2PO4  →  K+(aq) + H2PO4-(aq)
      conjugate base → H2PO4-(aq)
      K+ → no contribution to pH

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Problem Details

Calculate the pH of a buffer solution prepared from 0.155 mol of phosphoric acid, 0.250 mole of KH2PO4, and enough water to make 0.500 L of solution.

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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 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 Beaulac's class at MSU.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Chemistry - OpenStax 2015th Edition. You can also practice Chemistry - OpenStax 2015th Edition practice problems.