The acid of 'platoate' is named by using the stem of the anion name and adding -ic acid, making it 'hydroplatonic acid'.
The acid of the polyatomic anion 'platoate' would be named by taking the stem of the anion name and adding -ic acid. Since 'platoate' is an -ate ending anion, the acid would be named using the stem of the anion name plus -ic acid. Therefore, the correct answer would be hydroplatonic acid.
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