In the preparation of from barium peroxide, substituting dilute sulphuric acid with phosphoric acid () is often deemed advantageous. What is the primary chemical justification for this preference?

Question

In the preparation of $H_2O_2$ from barium peroxide, substituting dilute sulphuric acid with phosphoric acid ($H_3PO_4$) is often deemed advantageous. What is the primary chemical justification for this preference?

Prashant Kotian · Accepted Answer

Correct answer: B. When is used, it plays a dual role: it liberates by precipitating insoluble , and the acid itself acts as a negative catalyst (preservative) that retards the natural decomposition of the highly unstable product.

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