Which substance forms amorphous phosphates in alkaline urine that do not redissolve?

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Multiple Choice

Which substance forms amorphous phosphates in alkaline urine that do not redissolve?

The key idea is that urine pH determines which phosphate-containing substances precipitate. In alkaline urine, phosphate salts reach saturation and precipitate as amorphous phosphates—non-crystalline, chalky-looking particles rather than well-formed crystals. Because they lack a defined crystal structure, these amorphous phosphates tend to persist and do not redissolve under the test conditions that dissolve other crystalline phosphates. This behavior distinguishes them from other phosphate-related crystals that may dissolve with changes in pH. So the substance described as forming amorphous phosphates in alkaline urine that do not redissolve is the amorphous phosphates themselves.

The key idea is that urine pH determines which phosphate-containing substances precipitate. In alkaline urine, phosphate salts reach saturation and precipitate as amorphous phosphates—non-crystalline, chalky-looking particles rather than well-formed crystals. Because they lack a defined crystal structure, these amorphous phosphates tend to persist and do not redissolve under the test conditions that dissolve other crystalline phosphates. This behavior distinguishes them from other phosphate-related crystals that may dissolve with changes in pH. So the substance described as forming amorphous phosphates in alkaline urine that do not redissolve is the amorphous phosphates themselves.

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