Answer:10.0 mL of 0.00500 M phosphoric acid
Explanation:
If we look at the Ka values of the acids, we will realize that phosphoric acid has a Ka of 7.1 * 10-3. It is the only acid in the list having acid dissociation constant less than 1. This means that it does not ionize easily in solution and a very large volume of base must be added to ensure that it reacts completely. Acids with Ka >1 are generally regarded as strong acids. All the acids listed have Ka>1 except phosphoric acid.
The largest volume of 0.100 M sodium hydroxide solution for neutralization would be required by 20.0 mL of 0.0500 M nitric acid.
The volume of a solution can be calculated using the following expression:
CaVa = CbVb
Where;
According to this question, 0.100 M sodium hydroxide solution is given:
For nitric acid: 20 × 0.05 = 0.1 × Vb
Vb = 10mL
For hydrobromic acid: 15 × 0.05 = 0.1Vb
Vb = 7.5mL
For sulfuric acid: 5 × 0.01 = 0.1Vb
Vb = 0.5mL
For phosphoric acid: 10 × 0.005 = 0.1Vb
Vb = 0.5mL
Therefore, the largest volume of 0.100 M sodium hydroxide solution for neutralization would be required by 20.0 mL of 0.0500 M nitric acid.
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