Consider these compounds: A. Fe2S3 B. Zn3(PO4)2 C. CrPO4 D. CaCO3 Complete the following statements by entering the letter corresponding to the correct compound. Without doing any calculations it is possible to determine that cobalt(II) carbonate is more soluble than , and cobalt(II) carbonate is less soluble than . It is not possible to determine whether cobalt(II) carbonate is more or less soluble than by simply comparing Ksp values.

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Explanation:

Cobalt II carbonate is more soluble than iron III sulphide, Zn3(PO4)2 and CrPO4

Cobalt II carbonate is less soluble than calcium carbonate.

The ksp of the compounds were compared and this is the order of solubility as shown above.

Ksp shows the degree of solubility of an ionic compound. The lower the ksp, the lesser the solubility of the compound. Compounds with very low ksp are normally termed 'insoluble' in water.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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