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You would need more context dealing with bases. An acid only gives off protons if it has a base or bases to give them to. A polyprotic acid can release more than one proton but it doesn't have to. In fact, it is much easier for it to donate only one than two or more.
For this example, since it has 3 H atoms, it can donate up to 3 protons, but each time it donates one proton, the molecule gets a greater negative charge, so it is harder to pull more protons away.
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